CN106285628A - A kind of monitor without coal column gob side entry retaining floor crack grow detection system and method - Google Patents
A kind of monitor without coal column gob side entry retaining floor crack grow detection system and method Download PDFInfo
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- CN106285628A CN106285628A CN201610784252.7A CN201610784252A CN106285628A CN 106285628 A CN106285628 A CN 106285628A CN 201610784252 A CN201610784252 A CN 201610784252A CN 106285628 A CN106285628 A CN 106285628A
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- boring
- base plate
- hollow tube
- transparent hollow
- angle
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/002—Survey of boreholes or wells by visual inspection
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
Abstract
A kind of monitor the detection system and method grown without coal column gob side entry retaining floor crack, dig base plate drill site without coal column gob side entry retaining side, the boring to floor strata construction different angles, use Butt sealing system that transparent hollow tube is docked feeding boring piecemeal interior；After gap between boring and transparent hollow tube is carried out slip casting anchoring, utilize different graduation position boring wall-rock cracks on Detection location component record dip stick, repeatedly carry out base plate Mining failure rule evolution monitoring task until data tend towards stability can terminate observation in exploitation different phase.The present invention from boring drill site to treating that mining coal seam base plate direction extends the boring of base plate low-angle, angular hole-boring and the base plate wide-angle boring spatial arrangement base plate being arranged side by side, coal seam floor failure district developmental morphology after can drawing a circle to approve out base plate plastic failure area developmental morphology and seam mining by the same temporally adjacent boring of observation with the same boring crack situation in the difference coal mining stage, provides reliable data refer for safe construction.
Description
Technical field
The present invention relates to a kind of detection system and method monitored and grow without coal column gob side entry retaining floor crack, belong to mine
Supporting field.
Background technology
Coal resources in China distribution has the strongest regionality, and the coal resources of the most about 90% originate from North China Coalfield, sternly
High mine water damage form drastically influence China's coal-mine safety in production always, constrains the steady and sound development of national economy, coal
Field exploitation is significant to national economic development.China's many coalfield-hydrogeologies condition is sufficiently complex simultaneously, and coal seam is opened
Being threatened by various water bodies during adopting, the coal reserves that only main mining area, the north is threatened by karst water just there are about more than 150 hundred million
Ton, accounts for the 27% of proved reserves, and in the gushing water form of all water damage accidents, particularly pertinent seat earth water damage just accounts for
88.1%, serious threat coal mine production safety.Therefore, mining under safe waterpressure of aquifer coal-face coal seam floor failure gushing water is carried out in a deep going way
Calamity mechanism and early warning system research, the effectively generation of containment water bursting in mine accident, guarantee Safety of Coal Mine Production, be current China coal
The problem that charcoal industry is in the urgent need to address, has important meaning to raising inundation mine area production effect and resource recovery further
Justice, also for later with the coal seam safety and high efficiency offer reliable reference frame of science of type.
Base plate through for many years adopt field practice observation, generally believe working seam base plate also like overlying rock the same from
Bottom surface, coal seam can be divided into " Down Three Zone " to water-bearing layer end face, and i.e. base plate water guide destroys band, complete rock stratum band, artesian water lead a liter band.
" Down Three Zone " Theory comparison meets Seam Floor Failure, water inrush structure, has obtained relatively broad application in production practices, by
This is visible, and the on-the-spot field observation that base plate water guide destroys band is significant.In order to find out law of deformation and breakage rule, now
The research method used can use theoretical research, numerical simulation study and experimentation etc., although these methods are at understanding base plate
Strata movement deformation rule aspect serves critically important effect, but in engineering practice, utilizes measured data information to infer
Floor strata movement and deformation failure law is undoubtedly method the most direct, most reliable.
The method of the most on-the-spot field observation has: test is spied in sonic wave testing in borehole method, base plate drilling displacement meter method, boring
Water flood etc. is put in method, borehole stressmeter, boring.The most 1. sonic wave testing in borehole method, is that before and after observation is adopted, adopting of rock mass is split
Gap law of development and the mining induced fissure degree of depth；2. base plate drilling displacement meter method, is to arrange displacement observation basic point in the borehole with observation
Adopt the change in displacement rule of bottom plate in front；3. method of testing is spied in boring, for observing the floor rock during working face extraction
Crack macroscopic view changes；4. borehole stressmeter, is by gathering floor strata change in mechanics, it is thus achieved that floor strata ess-strain
Data, analyze coal seam floor failure situation；5. put water flood with boring, adopt forward direction seat earth and beat the inclined hole of certain depth, every day
The streamflow that the observation unit time is outside, not during outside flowing water, observation unit time every day water injection rate inwards, by adopting
In journey, the different depth boring unit interval puts the change of water injection rate and the comprehensive analysis of hydrogeologic condition, it is possible to knows and adopts
The Seam Floor Failure degree of depth that impact causes.In above several method, have boring only and spy on method of testing and belong to and directly observe country rock
The method of development law, has higher credibility and verity, but spies on the practical operation of method of testing in boring and monitored
The following difficult problem it is commonly present time in journey:
(1), during China's coal-mine working seam, gob side entry retaining is used can to leave the crossheading supporting again of a upper section for next
Individual section uses, and gob side entry retaining can Resource recovery to greatest extent, it is to avoid coal body loses, and gob side entry retaining is divided into reserved section coal pillar
Gob side entry retaining and without coal column gob side entry retaining.Gob side entry retaining under both of these case all will result in the boring of superficial part base plate and collapse hole occur,
Enter the protection casing of certain depth under even if, still suffer from monitoring section (without protection casing) and collapse hole phenomenon, and once send out
Raw collapse hole, is difficult to again repair, and only way is exactly again complement boring, not only wastes time and energy, and more likely misses optimal
Observation time；
(2) seat earth rock stratum is generally divided into hard formation, incompetent bed, soft and hard alternation rock stratum, if the construction base plate boring phase
Between run into incompetent bed or soft and hard alternation rock stratum, particularly hole monitoring section at base plate, owing to soft rock has chance water softening, as
Observing data not in time, soft rock section of may holing at short notice automatically closes or collapses so that borehole failure and have to
Complement is holed, and the most repeatedly complement boring, considerably increases monitoring cost；It is not only that the frequent replacing simultaneously holed causes consequence
Cannot effectively gather data available, same position different time crack macroscopic view changes also without reference to contrast, testing result can
The lowest by property.
(3) even if initial bore hole can be observed before seam mining smoothly spies on data, but along with coal-face is continuous
Advancing, base plate, owing to being occurred the change on mechanics to cause floor strata to crush by abutment pressure effect, causes routine
Open-hole use inspection instrument for borehole cause block, the first-class situation of stuck shooting, even can destroy shooting scope, bring certain
Economic loss.
(4) during observing, time be commonly encountered boring in exist in substantial amounts of muddy water, sewage, oil water mixture and water outstanding
Float and bubble, even if boring is constantly washed away in match-drill water filling, the most still cannot gather effective data, largely effect on observation
Definition and verity, and need after drawing data just to draw a general conclusion through substantial amounts of calculating and assessment,
And cannot ensure that conclusion is whether reliable, i.e. cannot the most accurately draw position and the development condition of formation variations, to follow-up just
Often construction brings the biggest potential safety hazard.
Summary of the invention
The problem existed for above-mentioned prior art, it is an object of the invention to provide one can improve borehole failure rate,
Reduce economic loss；Boring speculum safe handling can be ensured, ensure that detection process is normally carried out；Can be the most accurate
Go out rock crack situation of change and development condition, remain that boring is in the optimum efficiency of anhydrous observation, and can meet many
Secondary reuse, ensure that data monitor the detection system and method grown without coal column gob side entry retaining floor crack reliably.
For achieving the above object, the technical solution used in the present invention is: a kind of monitoring is without coal column gob side entry retaining floor crack
The detection system grown, including stope drift active workings, described stope drift active workings side is for treating back production coal seam, and opposite side is adjacent coal bed, phase
Adjacent coal seam is provided with base plate boring drill site, from base plate boring drill site to treating that below back production seat earth, extension is provided with base plate low-angle
Angular hole-boring and the boring of base plate wide-angle, angular hole-boring and base plate wide-angle in the boring of base plate low-angle, base plate in boring, base plate
Boring is arranged side by side successively, and spaced 1-2m, angular hole-boring and base plate wide-angle in the boring of described base plate low-angle, base plate
Boring is equipped with sealing observation cylinder, seals observation cylinder and expose hell 0.5～1.0m, in described sealing observation cylinder, be provided with detection
Positioning component；
The described observation cylinder that seals includes many interconnective transparent hollow tube, and adjacent transparent hollow pipe is by Butt sealing group
Part links together, and described Butt sealing assembly includes butt muff and is located at the " u "-shaped jump ring at butt muff two ends, described right
Female connector cylinder two ends are respectively fitted over adjacent clear hollow tube end, and two " u "-shaped jump rings are respectively perpendicular to butt muff from docking
The groove to perforation and transparent hollow tube on sleeve wall passes, and butt muff and adjacent transparent hollow tube are connected in one
Rise；
Described sealing is provided with dummy seal assembly at the bottom of observation cylinder cylinder, and described dummy seal assembly includes back cover sleeve, back cover
Sleeve is fixed on one end at the bottom of the cylinder sealing observation cylinder, and back cover sleeve bottom is provided with back cover face, the back cover face of described back cover sleeve
And seal between observing at the bottom of cylinder cylinder and the joint of adjacent transparent hollow pipe is equipped with waterproof " O " type pad；Described butt muff
Be equipped with anti-deviation parts on back cover sleeve drum outer wall, described anti-deviation parts include being located at sleeve outer wall along sleeve is circumferentially distributed
On three anti-deviation alignment pins, described three anti-deviation alignment pins radially screw in alignment pin screwed hole respectively and fasten along sleeve
On sleeve wall, and the hole wall of anti-deviation alignment pin outer end and boring is at a distance of 2～5mm；
Described sealing has the boring of large fluidity shrinking-free grouting material solidification formation to note between observation cylinder and borehole wall
Slurry, seals barrel inside observation cylinder and is provided with measurement parts, and described measurement parts include the dip stick that multistage scale is connected, institute
The length stating every section of dip stick is consistent with the length of transparent hollow tube, and one side indicates scale, and another side is fixing viscous by anchor adhesive
Knot is on clear hollow inside pipe wall；
Described Detection location assembly includes that essential safe type inspection instrument for borehole, essential safe type inspection instrument for borehole pass through cable
Line connects boring peeker, and described essential safe type inspection instrument for borehole is externally provided with abutment sleeve, around three spiral shells of abutment sleeve
Nail radially screws in along abutment sleeve from abutment sleeve outer wall respectively, and abutment sleeve is fixed on essential safe type inspection instrument for borehole
On；Being distributed with many springs on described abutment sleeve barrel, described spring radially extends along abutment sleeve, and one end is welded on
On abutment sleeve, the other end is fixed with anti-wiper ball.
Preferably, the material of described " u "-shaped jump ring is spring steel, and two fixed supporting leg ends of " u "-shaped jump ring are outside
Open.
Preferably, corresponding with the groove position of transparent hollow tube to perforation, and to piercing aperture on butt muff barrel
Identical with the fixed supporting leg diameter of " u "-shaped jump ring.
Preferably, the material of butt muff and transparent hollow tube is resin fibre or acrylic lucite.
Preferably, anti-deviation alignment pin material is rustless steel, and outer end is hemispherical.
Preferably, the inside and outside footpath of described waterproof " O " type pad is consistent with the inside and outside footpath of transparent hollow tube.
Preferably, described large fluidity shrinking-free grouting material includes early strengthening and high strengthening type portland cement, reinforcing agent, bone
Material, high efficiency water reducing agent, extender, fluid loss agent, anti-shrinking medium, defoamer and retarder, its weight ratio is 40-55%, 4-
13%, 35-50%, 0.3-1.6%, 2-8%, 0.01-0.6%, 0.01-0.2%, 0.1-0.8%, 0.5-1.5%, the ratio of mud
It is 0.12～0.20；
Described early strengthening and high strengthening type portland cement is 42.5R portland cement or 52.5R portland cement or weight ratio
The portland cement of 8:1 and the mixture of aluminate cement；
Described reinforcing agent is superfined flyash or high-calcium fly ass, and specification is 200～300 mesh；
Described aggregate is quartz sand, and particle diameter is distributed as 0～1.25mm；
Described high efficiency water reducing agent is polycarboxylic acid polymer high efficiency water reducing agent；
Described extender is UEA efficient low-alkali concrete extender or WZ-MPC polymer fiber extender；
Described fluid loss agent is hydroxyethyl cellulose；
Described anti-shrinking medium is polypropylene type fiber；
Described defoamer is amido polyethers defoamer or silicone defoamer；
Described retarder is the one in Tartaric acid, citric acid, boric acid, phosphate.
Preferably, the range of described dip stick is 1m or 2m.
Preferably, described abutment sleeve material is rustless steel or aluminium.
Present invention also offers a kind of method monitored and grow without coal column gob side entry retaining floor crack, comprise the steps:
Step 1, employing are exploited without coal pillar mining mode and are treated back production coal seam, treat that side, back production coal seam is stope drift active workings, back production
Tunnel is provided with base plate boring drill site adjacent to adjacent coal bed side；
Step 2, in base plate boring drill site, use colliery essential safe type underground drill rig along x direction, transverse section to treating back
The boring of different angles of constructing under mining coal seam base plate, i.e. in base plate low-angle boring, base plate, angular hole-boring and base plate wide-angle are bored
Hole, the spacing of adjacent boring is 1～2m；
Step 3, until the boring of base plate low-angle, after angular hole-boring and base plate wide-angle drilling construction complete in base plate, first
The multistage dip stick that, scale identical with clear hollow length of tube are connected is respectively adopted anchor adhesive be bonded in transparent hollow tube
Wall, and in transparent hollow tube, " little 1 ", " little 2 ", " little are marked the most respectively by the scale range of each section of dip stick
3 " ... ..., stand-by；
Step 4, constructed base plate low-angle boring in, waterproof " O " type pad is positioned over back cover sleeve
Bottom, and back cover sleeve is spun on the range initial end of the transparent hollow tube of mark " little 1 ", arranging around the distribution of back cover sleeve
Anti-deviation alignment pin is tightened at three alignment pin screwed holes on back cover sleeve wall；Then mark " little 1 " transparent in
Waterproof " O " type pad is placed in the other end of blank pipe, and takes a joint butt muff and be inserted in another of transparent hollow tube of " little 1 "
End, aligns the position of the groove to perforation and transparent hollow tube, inserts a " u "-shaped jump ring, thus fixed by butt muff
In the transparent hollow tube of mark " little 1 "；Initial one end of transparent hollow tube range of mark " little 2 " is butted up against outside butt muff
Dew mouth, and insert another root " u "-shaped jump ring at correspondence position, the transparent hollow tube of mark " little 2 " is fixed on butt muff
Together；Anti-deviation tightening at three alignment pin screwed holes that butt muff distribution is arranged in the middle part of butt muff on barrel
Alignment pin；By " little 1 " and " little 2 " transparent hollow tube connected slowly being sent into the boring of base plate low-angle, in " little 2 " clear hollow
Pipe exposes the other end of base plate low-angle drilling orifice installs mark " little 3 ", " little 4 " by that analogy ... transparent hollow tube,
Until " little 1 " transparent hollow tube falls at the bottom of base plate low-angle drilling hole, thus installation low-angle seals observation cylinder,
Later section transparent hollow tube need to expose the safe distance of drilling orifice 0.5～1m；
Step 5, the process of repeat the above steps 3-4, make and be designated " in 1, in 2, in 3 ... " and " big 1, big 2, greatly
3 ... " transparent hollow tube, and will mark " in 1, in 2, in 3 ... " transparent hollow tube angular hole-boring in the soleplate is installed
In, the transparent hollow tube by " big 1, big 2, big 3 ... " is arranged in the boring of base plate wide-angle, and in being formed respectively, angle seals is seen
Survey cylinder and wide-angle seals observation cylinder；
Step 6, each transparent hollow tube angular hole-boring and the boring of base plate wide-angle in the boring of base plate low-angle, base plate are installed
After in place, select large fluidity shrinking-free grouting material according to the lithology of floor rocks layer, and press the ratio of mud 0.12～0.20 and exist
After grouting material adds the abundant mix of mixing water, pour into angular hole-boring and base plate wide-angle in the boring of base plate low-angle, base plate
Boring, with the gap sealing observation cylinder, forms bored grouting body；
Step 7, injecting cement paste hole to be drilled reach 3 days to carry out the observation of first base plate mining induced fissure after comprcssive strength, first incite somebody to action this
Matter safety inspection instrument for borehole is connected in place by cable with the boring peeker of data collection host；
Step 8, essential safe type inspection instrument for borehole is provided with the abutment sleeve of anti-wiper ball through outer wall, around abutment sleeve
Three screws radially screw in along abutment sleeve from abutment sleeve outer wall respectively, abutment sleeve is fixed on essential safe type boring
On endoscope, and the axis of abutment sleeve is made to overlap with the axis of essential safe type inspection instrument for borehole；The most successively the end of at
Slowly transfer in the transparent hollow tube that in the boring of plate low-angle, base plate, angular hole-boring and base plate wide-angle connect in holing and be cased with
Photographic head is spied in the boring of abutment sleeve device, and boring peeker real time record is spied on video content for the first time, passed through clear hollow
Wall-rock crack developmental state on scale itemized record bored grouting body on the dip stick of inside pipe wall；
Step 9, when treating that back production coal seam is in exploitation, and coal-face and base plate boring drill site is at a distance of 1～2 cycle
During water component, goaf forms overburden of the goaf fissure zone, now carries out second time base plate and adopts wall-rock crack law of development
Observation, repeats the process of step 8, record base plate low-angle boring, saturating in angular hole-boring and the boring of base plate wide-angle in base plate
Wall-rock crack situation on bored grouting body at different scales on the dip stick of bright hollow pipe, and by this observed result with first
Observed result is analyzed, and tentatively judges coal seam floor failure form during exploitation；
Step 10, when treating that base plate boring drill site position was adopted in back production coal seam, and the compacting of overburden of the goaf fissure zone region is steady
After Ding, now stope drift active workings become without coal column gob side entry retaining, without using between coal column gob side entry retaining and overburden of the goaf fissure zone
Roadside support body, as top board roadside support, carries out third time base plate and adopts the observation of wall-rock crack law of development, repeat step 7-
The process of step 8, the transparent hollow tube during angular hole-boring and base plate wide-angle are holed in record base plate low-angle boring, base plate
Wall-rock crack situation on bored grouting body at different scales on dip stick, and by this observed result with see with second time first
Survey result is analyzed, coal seam floor failure form after delineation coal output layer exploitation.
The present invention, relative to prior art, has the advantage that
1. the detection system overall construction design of the present invention is reasonable, and many transparent hollow tube are by Butt sealing assembly and envelope
End black box is connected and fixed to form and seals observation cylinder, and makes structure by perfusion large fluidity shrinking-free grouting material
Sizing, can be effective against destructive power, it is possible to ensures that base plate drilling safe is stable, avoid the boring hole accident that collapses to occur, avoid
Base plate boring perforations adding situation, the most time saving and energy saving, more can gather valid data in time；Once mounting is in place just can repeatedly be continued
Safety monitoring, save cost, improve boring utilization rate；
2. by the enforcement of the present invention, can successfully manage hard formation, incompetent bed, soft and hard alternation rock stratum, passing fault crush
The complicated base plate geological structure such as band, greatly overcome soft floor and occur to meet water and soften the difficult problem such as shrinkage cavity, aperture Guan Bi, save
Repeatedly complement boring expense, gathers coal seam floor failure feature observation data timely and effectively, is not required to before and after the exploitation of safeguard work face
Frequently to change boring, utilize the progress of the cranny development of the boring observation different phase of same position, data truly may be used
Lean on.
3. it is placed in the Detection location assembly sealed in observation cylinder and can effectively protect essential safe type inspection instrument for borehole, keep
During detection, position is stably accurate, and spring has flexible bending regulatory function, even if elastic force can also be utilized after stress to be automatically adjusted
Reducing the impact to essential safe type inspection instrument for borehole, anti-wiper ball facilitates essential safe type inspection instrument for borehole and moves up and down, keeps away
Exempted to be stuck at boring monitoring section, stuck situation, greatly reduce noncontrollable factors, save instrument loss and material etc.
Expense；
4. seal observation cylinder and base plate boring between sealing perfusion large fluidity shrinking-free grouting material mobility up to
To 260-380mm, and in the case of the ratio of mud is little, available higher mobility, it is not necessary to manually vibrate or stir and just may be used
Complete filling space, small-bore, it is achieved self-compaction, Self-leveling effect；The material vertical expansion ratio of a day is 0.03～0.65%,
And scalable, its boring small-bore fill area is not produced contraction situation, does not haves transparent hollow tube and bored grouting body
Segregation phenomenon, it is ensured that adhesive surface is seamless, do not loosen；Getting up early intensity is high, 1 day comprcssive strength 20～45MPa, 28 days intensity up to
To 45～60MPa, sleeve pipe is installed can realize construction monitoring in latter second day；Acidic groundwater is had preferable corrosion resistance,
Corrosion-free to transparent hollow tube, can monitor for a long time.
The large fluidity shrinking-free grouting material of the present invention is poured molding latter aspect and is possible to prevent Floor water along brill
Hole is led and is risen and water inrush accident occurs, and protection Detection location assembly and boring will not be by muddy water, sewage, oil water mixture and water
Float and bubble are infected with and are affected observation；On the other hand same with country rock body around after the molding of large fluidity shrinking-free grouting material
Belonging to inorganic material, its physico-mechanical properties is close, can change self stress characteristic along with the change of country rock hydrodynamic properties,
With country rock body compatible deformation, combine dip stick by essential safe type inspection instrument for borehole and directly read boring through transparent hollow tube
What position, crack on injecting cement paste and form directly reflected is exactly position in boring, the floor rocks crack, and visual result can
Letter, can the most accurately draw position and the development condition of formation variations.
5. the method for testing that the present invention provides belongs to a kind of collection safe efficient, quick, timely without at the bottom of coal column gob side entry retaining
The technology of plate destructive characteristics observation data is little to treating that mining coal seam base plate direction extends the base plate being arranged side by side from base plate boring drill site
Angular hole-boring and base plate wide-angle boring spatial arrangement in angular hole-boring, base plate, can be by observing same temporally adjacent brill
Hole and same boring difference mine the stage crack situation delineation coal output layer exploitation in after coal seam floor failure form and seam mining
Coal seam floor failure form, sets offer foundation to staying of the effective water barrier of base plate, significant to coal seam in safety and stability exploitation pressure-bearing；
Additionally may further determine that base plate effective slip casting degree of depth and range of grouting, its floor grouting transformation situation made and accurately studies and judges analysis,
There is base plate retention of excessive fluid, water bursting disaster during being avoided as much as seam mining, provide reliable data refer for safe construction.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the amplification plan view in Fig. 1 at A；
Fig. 3 is present invention structural representation when forming overburden of the goaf fissure zone in back production seam mining；
Fig. 4 is that the present invention treats that base plate boring drill site position, and the compacting of overburden of the goaf fissure zone region were adopted in back production coal seam
Structural representation after Wen Ding；
Fig. 5 is the unitary construction schematic diagram (bored grouting body illustrates a part) that the present invention seals observation cylinder；
Fig. 6 is that the present invention seals observation barrel structure generalized section (bored grouting body illustrates a part)；
Fig. 7 is the A-A generalized section (bored grouting body illustrates a part) of Fig. 6 of the present invention；
Fig. 8 is the B-B generalized section (bored grouting body illustrates a part) of Fig. 6 of the present invention；
Fig. 9 is the C-C generalized section (bored grouting body illustrates a part) of Fig. 6 of the present invention；
Figure 10 is the D-D generalized section (bored grouting body illustrates a part) of Fig. 6 of the present invention；
Figure 11 is the E-E generalized section (bored grouting body illustrates a part) of Fig. 6 of the present invention；
Figure 12 is the inside partial structurtes enlarged drawing of Figure 11 of the present invention；
Figure 13 is that the present invention seals observation cylinder internal detection positioning component schematic enlarged-scale view；
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail.
The detection system grown without coal column gob side entry retaining floor crack is monitored as it can be seen, a kind of, including stope drift active workings 42,
Described stope drift active workings 42 side is for treating back production coal seam 43, and opposite side is adjacent coal bed 40；Treat that back production coal seam 43 opposite side is air intake
Tunnel 44, adjacent coal bed 40 is provided with base plate boring drill site 41, from base plate boring drill site 41 to treating below the base plate of back production coal seam 43
Extending and be provided with angular hole-boring 46 and base plate wide-angle boring 47 in base plate low-angle boring 45, base plate, periphery is the wall of a borehole country rock
Body 1, in base plate low-angle boring 45, base plate, angular hole-boring 46 and base plate wide-angle boring 47 are arranged side by side successively, and respectively hole
Spacing along stope drift active workings 42 longitudinal axis is 1～2m, angular hole-boring 46 and the end in described base plate low-angle boring 45, base plate
Plate wide-angle boring 47 is equipped with sealing observation cylinder, seals observation cylinder and expose hell 0.5～1.0m, described sealing observation cylinder
Inside it is provided with Detection location assembly；
The described observation cylinder that seals includes many interconnective transparent hollow tube 8, and adjacent transparent hollow pipe 8 is by Butt sealing
Assembly links together, and described Butt sealing assembly includes butt muff 7 and is located at the " u "-shaped jump ring 5 at butt muff 7 two ends,
Described butt muff 7 two ends are respectively fitted over adjacent transparent hollow tube 8 end, and two " u "-shaped jump rings 5 are respectively perpendicular to female connector
Cylinder 7 passing perforation 6 and the grooves 24 of transparent hollow tube 8 from butt muff 7 barrel, by butt muff 7 and adjacent saturating
Bright hollow pipe 8 connects together；
Described sealing is provided with dummy seal assembly at the bottom of observation cylinder cylinder, and described dummy seal assembly includes back cover sleeve 19, envelope
End sleeve 19 is threaded connection to be fixed on bottom one end, and back cover sleeve 19 at the bottom of the cylinder sealing observation cylinder and is provided with back cover face 22,
The back cover face 22 of described back cover sleeve 19 and between sealing at the bottom of observation cylinder cylinder and the joint of adjacent transparent hollow pipe 8 is equipped with anti-
Water " O " type pad 11；Anti-deviation parts, described anti-deviation parts it are equipped with on described butt muff 7 and back cover sleeve 19 outer wall
Including along the sleeve anti-deviation alignment pin 9 of circumferentially distributed three be located on sleeve outer wall, described three anti-deviation alignment pins 9 are respectively
Radially screw in alignment pin screwed hole 10 along sleeve and be fastened on sleeve wall, and the hole of anti-deviation alignment pin 9 outer end and boring
Wall is at a distance of 2～5mm；
Described sealing has the boring of large fluidity shrinking-free grouting material solidification formation to note between observation cylinder and borehole wall
Slurry 3, seals barrel inside observation cylinder and is provided with measurement parts, and described measurement parts include the dip stick 4 that multistage scale is connected,
The length of described every section of dip stick 4 is consistent with the length of transparent hollow tube 8, and one side indicates scale, and another side passes through anchor adhesive 23
Fix and be bonded on transparent hollow tube 8 inwall；
Described Detection location assembly includes that essential safe type inspection instrument for borehole 18, essential safe type inspection instrument for borehole 18 pass through
Cable 12 connects boring peeker 53, and described essential safe type inspection instrument for borehole 18 is externally provided with abutment sleeve 13, around location
Three screws 15 of sleeve 13 radially screw in along abutment sleeve 13 from abutment sleeve 13 outer wall respectively, are fixed on by abutment sleeve 13
On essential safe type inspection instrument for borehole 18, screw 15 matches with bush whorl hole 16 with external screw thread 25, external screw thread 25；Described
Being distributed with many springs 17 on abutment sleeve 13 barrel, described spring 17 radially extends along abutment sleeve 13, and one end welding
On abutment sleeve 13, the other end is fixed with anti-wiper ball 14.Spring 17 structure has flexible bending function, permissible after stress deformation
Reducing the impulsive force impact to essential safe type inspection instrument for borehole 18, anti-wiper ball 14 facilitates Detection location assembly in clear hollow
Pipe 8 moves up and down, it is to avoid stuck equipment situation occur.
Preferably, the material of described " u "-shaped jump ring 5 is spring steel, and two fixed supporting leg ends of " u "-shaped jump ring 5 to
Open outward.After sending into boring, " u "-shaped jump ring 5 fixed supporting leg end is flared out, and will not be able to fall off with clamping the wall of a borehole
Situation.
Preferably, 6 corresponding with groove 24 position of transparent hollow tube 8 to perforation on butt muff 7 barrel, and to perforation
6 apertures are identical with the fixed supporting leg diameter of " u "-shaped jump ring 5.Thus the fixed supporting leg of " u "-shaped jump ring 5 can with to 6 close-fittings of boring a hole
Close, it is ensured that transparent hollow tube 8 can firmly be coupled together by butt muff 7.
Preferably, the material of butt muff 7 and transparent hollow tube 8 is resin fibre or acrylic lucite.Choose
Machine transparent material, on the one hand ensure that the intensity of material, will not crush when stress；On the other hand, it is ensured that transparent
Degree, convenient observation cranny development situation.
Preferably, anti-deviation alignment pin 9 material is rustless steel, and outer end is hemispherical.Stainless steel is possible to prevent rust
Erosion, it is ensured that use safety, it is anti-deviation fixed that the most hemispheric end face is possible to prevent each boring to produce during the generation drastic mechanical deformation of crack
Serious gouging abrasion, the service life of extension fixture is there is in the outer end of position pin 9 with the hole wall of boring.
Preferably, the inside and outside footpath of described waterproof " O " type pad 11 is consistent with the inside and outside footpath of transparent hollow tube 8.Can protect
Card sealing effectiveness, prevents liquid from entering.
Preferably, described large fluidity shrinking-free grouting material includes early strengthening and high strengthening type portland cement, reinforcing agent, bone
Material, high efficiency water reducing agent, extender, fluid loss agent, anti-shrinking medium, defoamer and retarder, its weight ratio is 40-55%, 4-
13%, 35-50%, 0.3-1.6%, 2-8%, 0.01-0.6%, 0.01-0.2%, 0.1-0.8%, 0.5-1.5%, the ratio of mud
It is 0.12～0.20；
Described early strengthening and high strengthening type portland cement is 42.5R portland cement or 52.5R portland cement or weight ratio
The portland cement of 8:1 and the mixture of aluminate cement；
Described reinforcing agent is superfined flyash or high-calcium fly ass, and specification is 200～300 mesh；
Described aggregate is quartz sand, and particle diameter is distributed as 0～1.25mm；
Described high efficiency water reducing agent is polycarboxylic acid polymer high efficiency water reducing agent；
Described extender is UEA efficient low-alkali concrete extender or WZ-MPC polymer fiber extender；
Described fluid loss agent is hydroxyethyl cellulose；
Described anti-shrinking medium is polypropylene type fiber；
Described defoamer is amido polyethers defoamer or silicone defoamer；
Described retarder is the one in Tartaric acid, citric acid, boric acid, phosphate.
Preferably, the range of dip stick is 1m or 2m.Wall-rock crack is directly read in boring by dip stick when observation
Interior position, compares the range data of more traditional indirect acquisition, and error is the least.
Preferably, essential safe type inspection instrument for borehole 18 is essential safe type borehole camera head.
Preferably, described abutment sleeve 13 material is rustless steel or aluminium.Rustless steel or aluminium are difficult to corrosion, make positioning sleeve
Cylinder 13 can play, while location, the effect of being effectively protected.
Specific embodiment:
Prepare a certain proportion of large fluidity shrinking-free grouting material the most on the ground standby for down-hole.Large fluidity
Shrinking-free grouting material component includes inorganic gum base, reinforcing agent, aggregate, high efficiency water reducing agent, extender, fluid loss agent, anti-shrinkage
Agent, defoamer and retarder, its weight ratio is 45.6%, 6.3%, 42.5%, 0.85%, 3.54%, 0.056%,
0.012%, 0.48%, 0.76%, wherein:
The most inorganic gum base is early strengthening and high strengthening type portland cement, and model is 42.5R portland cement；
2. reinforcing agent is high-calcium fly ass, and specification is 200～300 mesh；
3. aggregate is quartz sand, and particle diameter is distributed as 0～1.25mm, wherein 0～0.16mm accounts for 15%, 0.16～0.325mm
Account for 35%, 0.325～0.85mm to account for 32%, 0.85～1.25mm and account for 18%；
4. high efficiency water reducing agent is polycarboxylic acid polymer high efficiency water reducing agent；
5. extender is WZ-MPC polymer fiber extender；
6. fluid loss agent is hydroxyethyl cellulose；
7. anti-shrinking medium is polypropylene type fiber；
8. defoamer is silicone defoamer；
9. retarder is phosphate；
Monitor the method grown without coal column gob side entry retaining floor crack specific as follows:
Step 1, employing are exploited without coal pillar mining mode and are treated back production coal seam 43, treat that side, back production coal seam 43 is stope drift active workings
42, stope drift active workings 42 are provided with base plate boring drill site 41 adjacent to adjacent coal bed 40 side, and base plate boring drill site 41 length not only ensures
In base plate low-angle boring 45 to be onstructed, base plate, angular hole-boring 46 and the boring 47 of base plate wide-angle are along stope drift active workings 42 longitudinal axis
Y spacing 1～2m, and the effective dimensions of the length of construction drill rig operation to be ensured.Take base plate boring drill site 41
Size: long * width * height=10m*6m*6.5m.
Step 2, in base plate boring drill site 41, use colliery essential safe type underground drill rig along x direction, transverse section to treating
The boring (the whole bore dia φ=105mm of boring) of different angles of constructing under the base plate of back production coal seam 43, i.e. base plate low-angle boring 45
Angular hole-boring 46 in (vertical depth 13.3m, 28 ° be angled downward), base plate (vertical depth 21.5m, 57 ° be angled downward) and base plate
Wide-angle boring 47 (vertical depth 26m, 75 ° be angled downward), adjacent boring is 1 along the spacing of stope drift active workings 42 longitudinal axis
～2m；
Step 3, treat base plate low-angle boring 45, in base plate angular hole-boring 46 and base plate wide-angle boring 47 constructed
After, first will identical with transparent hollow tube 8 length (a length of 1m), scale be connected (0～1.0m, 1.0～2.0m, 2.0～
3.0m... is by that analogy) multistage dip stick 4 be respectively adopted anchor adhesive 23 and be bonded in transparent hollow tube 8 inwall (transparent hollow tube
Internal diameter φ=45mm external diameter φ=55mm, wall thickness 5mm), and by the scale range of each section of dip stick 4 the most respectively transparent
" little 1 ", " little 2 ", " little 3 " are marked on hollow pipe 8 ... ..., stand-by；
Step 4, constructed base plate low-angle boring 45 in, waterproof " O " type pad 11 (pad internal diameter φ
=45mm external diameter φ=55mm, thickness 6mm) it is positioned over bottom back cover sleeve 19, and make the female thread 20 of back cover sleeve 19 with saturating
The match range of the transparent hollow tube 8 that back cover sleeve 19 is spun on mark " little 1 " of the external screw-thread 21 of bright hollow pipe 8 is initial
End, anti-deviation tightening at three alignment pin screwed holes 10 that back cover sleeve 19 distribution is arranged on back cover sleeve 19 barrel
Alignment pin 9；Then waterproof " O " type pad 11 is placed in the other end in the transparent hollow tube 8 of mark " little 1 ", and it is right to take a joint
Female connector cylinder 7 (internal diameter φ=55mm, external diameter φ=65mm, wall thickness 5mm) is inserted in the other end of the transparent hollow tube 8 of " little 1 ", by right
The position of the groove 24 of perforation 6 and transparent hollow tube 8 aligns, and inserts a " u "-shaped jump ring 5, thus is fixed on by butt muff 7
In the transparent hollow tube 8 of mark " little 1 "；Initial one end of transparent hollow tube 8 range of mark " little 2 " is butted up against butt muff 7
Exposed mouth, and insert another root " u "-shaped jump ring 5 at correspondence position, the transparent hollow tube 8 that will mark " little 2 " is solid with butt muff 7
It is scheduled on together；Twisting at three alignment pin screwed holes 10 that butt muff 7 distribution is arranged in the middle part of butt muff 7 on barrel
Tight anti-deviation alignment pin 9；" little 1 " and " little 2 " transparent hollow tube 8 connected slowly will be sent into base plate low-angle boring 45,
" little 2 " transparent hollow tube 8 exposes the hole other end in 45 apertures of base plate low-angle installs mark " little 3 ", " little by that analogy
4 " ... transparent hollow tube 8, until " little 1 " transparent hollow tube 8 falls into base plate low-angle and holes at the bottom of 45 holes, thus installation
Low-angle seals observation cylinder, and final section transparent hollow tube 8 need to expose the safe distance of drilling orifice 0.5～1m simultaneously, in case
Only the transparent hollow tube 8 connected internal entrance sewage or grouting serous fluid are poured in down a chimney in it.
Step 5, the process of repeat the above steps 3-4, make and be designated " in 1, in 2, in 3 ... " and " big 1, big 2, greatly
3 ... " transparent hollow tube 8, and will mark " in 1, in 2, in 3 ... " transparent hollow tube 8 install in the soleplate angle bore
In hole 46, the transparent hollow tube 8 by " big 1, big 2, big 3 ... " is arranged in base plate wide-angle boring 47, angle in being formed respectively
Degree seals observation cylinder and wide-angle seals observation cylinder；
Step 6, each transparent hollow tube 8 angular hole-boring 46 and base plate wide-angle in base plate low-angle boring 45, base plate are bored
Hole 47 install in place after, the large fluidity shrinking-free grouting material that the aforementioned lithology according to floor rocks layer selects is pressed the ratio of mud
After 0.158 adds the abundant mix of mixing water in grouting material, pour into angular hole-boring 46 and in base plate low-angle boring 45, base plate
Base plate wide-angle boring 47, with the gap sealing observation cylinder, forms bored grouting body 3；
Step 7, injecting cement paste hole to be drilled 3 reach 3 days to carry out the observation of first base plate mining induced fissure after comprcssive strength, first incite somebody to action this
Matter safety inspection instrument for borehole 18 is connected in place by cable 12 with the boring peeker 53 of data collection host；
Step 8, essential safe type inspection instrument for borehole 18 is provided with the abutment sleeve 13 of anti-wiper ball 14, around fixed through outer wall
Three screws 15 of position sleeve 13 radially screw in along abutment sleeve 13 from abutment sleeve 13 outer wall respectively, are fixed by abutment sleeve 13
On essential safe type inspection instrument for borehole 18, and make in axis and the essential safe type inspection instrument for borehole 18 of abutment sleeve 13
Dead in line；Connect in angular hole-boring 46 and base plate wide-angle boring 47 in base plate low-angle boring 45, base plate the most successively
Slowly transferring in good transparent hollow tube 8 and be cased with the boring of abutment sleeve 13 device and spy on photographic head, boring peeker 53 is real-time
Record spies on video content, for the first time by the scale itemized record bored grouting body 3 on the dip stick 4 of transparent hollow tube 8 inwall
Upper wall-rock crack developmental state；
Step 9, when treating that back production coal seam 43 is in exploitation, and coal-face and base plate boring drill site 28 is at a distance of 1～2
During periodic weighting step pitch, goaf forms overburden of the goaf fissure zone 48, now carries out second time base plate and adopts wall-rock crack and send out
Educate rule observation, repeat the process of step 8, angular hole-boring 46 and base plate wide-angle in record base plate low-angle boring 45, base plate
Wall-rock crack situation on bored grouting body 3 at different scales on the dip stick 4 of the transparent hollow tube 8 in boring 47, and by this
Secondary observed result is analyzed with First Observation result, tentatively judges coal seam floor failure form 51 during exploitation；Owing to being subject to
To seam mining disturbing influence, bottom slab stress changes, and is positioned at the bored grouting within coal seam floor failure form 51 during exploitation
Body 3 will be broken bad by tension and compression, and the cranny development of bored grouting body 3 can be by the essence peace of lower section in transparent hollow tube 8 herein
Holotype inspection instrument for borehole 18 is directly observed, and can obtain good observed result, and Detection location assembly can avoid the occurrence of and block, blocks
A difficult problem for dead camera device " cannot be up and down ".On-the-spot for second time actual observation result is fed back to technical staff, can be directly perceived
Understanding bored grouting body 3 Crack change, bored grouting body 3 Crack change directly reflects that base plate is adopted wall-rock crack and grown rule
Rule；The most also its floor grouting transformation situation can be made and accurately study and judge analysis, occur during being avoided as much as seam mining
Base plate retention of excessive fluid, water bursting disaster.
Step 10, when treating that base plate boring drill site 41 position, and overburden of the goaf fissure zone 48 region were adopted in back production coal seam 43
After stabilization by compaction, now stope drift active workings 42 become, without coal column gob side entry retaining 50, splitting with overburden of the goaf without coal column gob side entry retaining 50
Use roadside support body 49 as top board roadside support between gap band 48, carry out third time base plate and adopt wall-rock crack law of development
Observation, repeats the process of step 7-step 8, angular hole-boring 46 and base plate wide-angle in record base plate low-angle boring 45, base plate
Wall-rock crack situation on bored grouting body 3 at different scales on the dip stick 4 of the transparent hollow tube 8 in boring 47, and by this
Secondary observed result be analyzed with second time observed result first, delineation coal output layer exploitation after coal seam floor failure form 52；
The base plate that is given that thus can be quantitative adopts surrounding rocks failure and the base plate Mining failure degree of depth, and water barrier effective to base plate stays and set
Providing reference, significant to coal seam in safety and stability exploitation pressure-bearing, the slip casting degree of depth effective to its base plate and range of grouting carry
Supply scientific basis.
The present embodiment only carries out three observation, has been actually needed according to scene and can also increase the number of times of observation, pass through
Improve observation density and accurately understand floor crack growth course.
Claims (10)
1. monitor the detection system grown without coal column gob side entry retaining floor crack, including stope drift active workings (42), described back production
Tunnel (42) side is for treating back production coal seam (43), and opposite side is adjacent coal bed (40), it is characterised in that adjacent coal bed sets on (40)
There is base plate boring drill site (41), from base plate boring drill site (41) to treating that below back production coal seam (43) base plate, extension is provided with the little angle of base plate
Angular hole-boring (46) and base plate wide-angle boring (47) in degree boring (45), base plate, angle in base plate low-angle boring (45), base plate
Degree boring (46) and base plate wide-angle boring (47) are arranged side by side successively, and spaced 1-2m, and described base plate low-angle is holed
(45), base plate is equipped with sealing observation cylinder in angular hole-boring (46) and base plate wide-angle boring (47), seals observation cylinder and expose
Hell 0.5～1.0m, is provided with Detection location assembly in described sealing observation cylinder；
The described observation cylinder that seals includes many interconnective transparent hollow tube (8), and adjacent transparent hollow pipe (8) is by Butt sealing
Assembly links together, and described Butt sealing assembly includes butt muff (7) and is located at the " u "-shaped card at butt muff (7) two ends
Spring (5), described butt muff (7) two ends are respectively fitted over adjacent transparent hollow tube (8) end, and two " u "-shaped jump rings (5) are respectively
It is perpendicular to the butt muff (7) groove (24) to perforation (6) and transparent hollow tube (8) from butt muff (7) barrel pass,
Butt muff (7) and adjacent transparent hollow tube (8) are connected together；
Described sealing is provided with dummy seal assembly at the bottom of observation cylinder cylinder, and described dummy seal assembly includes back cover sleeve (19), back cover
Sleeve (19) is fixed on one end at the bottom of the cylinder sealing observation cylinder, and back cover sleeve (19) bottom is provided with back cover face (22), described back cover
The back cover face (22) of sleeve (19) and between sealing at the bottom of observation cylinder cylinder and the joint of adjacent transparent hollow pipe (8) is equipped with waterproof
" O " type pad (11)；It is equipped with anti-deviation parts on described butt muff (7) and back cover sleeve (19) outer wall, described anti-deviation
Parts include along circumferentially distributed three the anti-deviation alignment pins (9) being located on sleeve outer wall of sleeve, described three anti-deviation location
Pin (9) radially screws in alignment pin screwed hole (10) respectively and is fastened on sleeve wall along sleeve, and anti-deviation alignment pin (9) is outward
End and the hole wall holed are at a distance of 2～5mm；
Described sealing has large fluidity shrinking-free grouting material to solidify the bored grouting body formed between observation cylinder and borehole wall
(3), sealing barrel inside observation cylinder and be provided with measurement parts, described measurement parts include the dip stick (4) that multistage scale is connected,
The length of described every section of dip stick (4) is consistent with the length of transparent hollow tube (8), and one side indicates scale, and another side is by anchoring
Glue (23) is fixing to be bonded on transparent hollow tube (8) inwall；
Described Detection location assembly includes that essential safe type inspection instrument for borehole (18), essential safe type inspection instrument for borehole (18) pass through
Cable (12) connects boring peeker (53), and described essential safe type inspection instrument for borehole (18) is externally provided with abutment sleeve (13),
Three screws (15) around abutment sleeve (13) radially screw in along abutment sleeve (13) from abutment sleeve (13) outer wall respectively, will
Abutment sleeve (13) is fixed on essential safe type inspection instrument for borehole (18)；It is distributed with many on described abutment sleeve (13) barrel
Root spring (17), described spring (17) radially extends along abutment sleeve (13), and one end is welded on abutment sleeve (13), another
End is fixed with anti-wiper ball (14).
A kind of detection system monitored without the growth of coal column gob side entry retaining floor crack the most according to claim 1, its feature
Being, the material of described " u "-shaped jump ring (5) is spring steel, and two fixed supporting leg ends of " u "-shaped jump ring (5) are flared out.
A kind of detection system monitored without the growth of coal column gob side entry retaining floor crack the most according to claim 1, its feature
It is, corresponding with the groove of transparent hollow tube (8) (24) position to perforation (6), and to perforation on butt muff (7) barrel
(6) aperture is identical with the fixed supporting leg diameter of " u "-shaped jump ring (5).
A kind of detection system monitored without the growth of coal column gob side entry retaining floor crack the most according to claim 1, its feature
Being, the material of butt muff (7) and transparent hollow tube (8) is resin fibre or acrylic lucite.
A kind of detection system monitored without the growth of coal column gob side entry retaining floor crack the most according to claim 1, its feature
Being, anti-deviation alignment pin (9) material is rustless steel, and outer end is hemispherical.
A kind of detection system monitored without the growth of coal column gob side entry retaining floor crack the most according to claim 1, its feature
Being, the inside and outside footpath of described waterproof " O " type pad (11) is consistent with the inside and outside footpath of transparent hollow tube (8).
A kind of detection system monitored without the growth of coal column gob side entry retaining floor crack the most according to claim 1, its feature
Being, described large fluidity shrinking-free grouting material includes early strengthening and high strengthening type portland cement, reinforcing agent, aggregate, efficient diminishing
Agent, extender, fluid loss agent, anti-shrinking medium, defoamer and retarder, its weight ratio is 40-55%, 4-13%, 35-50%,
0.3-1.6%, 2-8%, 0.01-0.6%, 0.01-0.2%, 0.1-0.8%, 0.5-1.5%, the ratio of mud is 0.12～0.20；
Described early strengthening and high strengthening type portland cement is 42.5R portland cement or 52.5R portland cement or weight ratio 8:1
Portland cement and the mixture of aluminate cement；
Described reinforcing agent is superfined flyash or high-calcium fly ass, and specification is 200～300 mesh；
Described aggregate is quartz sand, and particle diameter is distributed as 0～1.25mm；
Described high efficiency water reducing agent is polycarboxylic acid polymer high efficiency water reducing agent；
Described extender is UEA efficient low-alkali concrete extender or WZ-MPC polymer fiber extender；
Described fluid loss agent is hydroxyethyl cellulose；
Described anti-shrinking medium is polypropylene type fiber；
Described defoamer is amido polyethers defoamer or silicone defoamer；
Described retarder is the one in Tartaric acid, citric acid, boric acid, phosphate.
A kind of detection system monitored without the growth of coal column gob side entry retaining floor crack the most according to claim 1, its feature
Being, the range of described dip stick is 1m or 2m.
A kind of detection system monitored without the growth of coal column gob side entry retaining floor crack the most according to claim 1, its feature
Being, described abutment sleeve (13) material is rustless steel or aluminium.
10. monitor the method grown without coal column gob side entry retaining floor crack for one kind, it is characterised in that comprise the steps:
Step 1, employing are exploited without coal pillar mining mode and are treated back production coal seam (43), treat that back production coal seam (43) side is stope drift active workings
(42), neighbouring adjacent coal bed (40) side of stope drift active workings (42) is provided with base plate boring drill site (41)；
Step 2, in base plate boring drill site (41), employing colliery essential safe type underground drill rig along x direction, transverse section to treating back
The boring of different angles of constructing under mining coal seam (43) base plate, i.e. base plate low-angle boring (45), base plate in angular hole-boring (46) and
Base plate wide-angle boring (47), the spacing of adjacent boring is 1～2m；
Step 3, treat in base plate low-angle boring (45), base plate angular hole-boring (46) and base plate wide-angle hole (47) constructed
After, first the multistage dip stick (4) that, scale identical with transparent hollow tube (8) length are connected is respectively adopted anchor adhesive (23) and glues
Tie in transparent hollow tube (8) inwall, and by the scale range of each section of dip stick (4) the most respectively in transparent hollow tube (8)
Upper mark " little 1 ", " little 2 ", " little 3 " ... ..., stand-by；
Step 4, constructed base plate low-angle boring (45) in, one waterproof " O " type pad (11) are positioned over back cover
Sleeve (19) bottom, and back cover sleeve (19) is spun on the range initial end of the transparent hollow tube (8) of mark " little 1 ", in cincture
It is anti-deviation fixed that three alignment pin screwed hole (10) places that back cover sleeve (19) distribution is arranged on back cover sleeve (19) barrel tighten
Position pin (9)；Then waterproof " O " type pad (11) is placed in the other end in the transparent hollow tube (8) of mark " little 1 ", and takes one
Joint butt muff (7) is inserted in the other end of the transparent hollow tube (8) of " little 1 ", will lead to perforation (6) and transparent hollow tube (8)
The position of groove (24) aligns, and inserts a " u "-shaped jump ring (5), thus butt muff (7) is fixed on the transparent of mark " little 1 "
On hollow pipe (8)；Initial one end of transparent hollow tube (8) range of mark " little 2 " is butted up against butt muff (7) exposed mouth, and
Inserting another root " u "-shaped jump ring (5) at correspondence position, the transparent hollow tube (8) that will mark " little 2 " is fixed with butt muff (7)
Together；Three the alignment pin screwed holes (10) being arranged on the barrel of butt muff (7) middle part around butt muff (7) distribution
Anti-deviation alignment pin (9) is tightened at place；Bore " little 1 " and " little 2 " transparent hollow tube (8) connected slowly being sent into base plate low-angle
Hole (45), the other end exposing base plate low-angle boring (45) aperture in " little 2 " transparent hollow tube (8) installs mark by that analogy
" little 3 ", " little 4 " ... transparent hollow tube (8), until " little 1 " transparent hollow tube (8) fall into base plate low-angle boring (45) hole
The end, final section transparent hollow tube (8) need to expose the safe distance of drilling orifice 0.5～1m simultaneously, thus the little angle of installation
Degree seals observation cylinder；
Step 5, the process of repeat the above steps 3-4, make and be designated " in 1, in 2, in 3 ... " and " big 1, big 2, greatly
3 ... " transparent hollow tube (8), and will mark " in 1, in 2, in 3 ... " transparent hollow tube (8) angle in the soleplate is installed
In degree boring (46), the transparent hollow tube (8) by " big 1, big 2, big 3 ... " is arranged in base plate wide-angle boring (47), point
Not Xing Cheng in angle seals observation cylinder and wide-angle seal observation cylinder；
Step 6, each transparent hollow tube (8) be angular hole-boring (46) and base plate wide-angle in base plate low-angle boring (45), base plate
Boring (47) install in place after, select large fluidity shrinking-free grouting material according to the lithology of floor rocks layer, and press the ratio of mud
After 0.12～0.20 adds the abundant mix of mixing water in grouting material, pour into angle in base plate low-angle boring (45), base plate
Boring (46) and base plate wide-angle boring (47), with the gap sealing observation cylinder, form bored grouting body (3)；
Step 7, injecting cement paste hole to be drilled (3) reach 3 days to carry out the observation of first base plate mining induced fissure after comprcssive strength, first by essence
Safety inspection instrument for borehole (18) is connected in place by cable (12) with the boring peeker (53) of data collection host；
Step 8, essential safe type inspection instrument for borehole (18) is provided with the abutment sleeve (13) of anti-wiper ball (14), cincture through outer wall
Three screws (15) of abutment sleeve (13) radially screw in along abutment sleeve (13) from abutment sleeve (13) outer wall respectively, will location
Sleeve (13) is fixed on essential safe type inspection instrument for borehole (18), and makes axis and the essential safe type of abutment sleeve (13)
The axis of inspection instrument for borehole (18) overlaps；The most successively base plate low-angle boring (45), base plate in angular hole-boring (46) and
Slowly transfer, in the transparent hollow tube (8) connected in base plate wide-angle boring (47), the boring being cased with abutment sleeve (13) device
Spying on photographic head, boring peeker (53) real time record spies on video content, for the first time by the measurement of transparent hollow tube (8) inwall
The upper wall-rock crack developmental state of scale itemized record bored grouting body (3) on chi (4)；
Step 9, when treating that back production coal seam (43) is in exploitation, and coal-face and base plate boring drill site (28) are at a distance of 1～2
During periodic weighting step pitch, goaf forms overburden of the goaf fissure zone (48), now carries out second time base plate and adopts wall-rock crack
Law of development is observed, and repeats the process of step 8, angular hole-boring (46) and base plate in record base plate low-angle boring (45), base plate
The upper country rock of bored grouting body (3) at the upper different scales of the dip stick (4) of the transparent hollow tube (8) in wide-angle boring (47) splits
Gap situation, and this observed result is analyzed with First Observation result, tentatively judge coal seam floor failure during exploitation
Form (51)；
Step 10, when treating that base plate boring drill site (41) position, and overburden of the goaf fissure zone (48) district were adopted in back production coal seam (43)
After the stabilization by compaction of territory, now stope drift active workings (42) become without coal column gob side entry retaining (50), without coal column gob side entry retaining (50) with mined out
Use roadside support body (49) as top board roadside support between district's overlying strata fissure zone (48), carry out third time base plate and adopt country rock
Cranny development rule is observed, and repeats the process of step 7-step 8, angular hole-boring in record base plate low-angle boring (45), base plate
(46) the bored grouting body at the upper different scales of the dip stick (4) of the transparent hollow tube (8) and in base plate wide-angle boring (47)
(3) upper wall-rock crack situation, and by this observed result be analyzed with second time observed result first, delineation is produced coal
Coal seam floor failure form (52) after layer exploitation.
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| CN113622907A (en) * | 2021-09-07 | 2021-11-09 | 中国矿业大学 | Single-hole synchronous monitoring method for movement and fracture distribution in coal seam mining overburden rock |
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