CN103628912B - The construction method of filling grouting is processed in a kind of goaf - Google Patents
The construction method of filling grouting is processed in a kind of goaf Download PDFInfo
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Abstract
A construction method for filling grouting is processed in goaf, and the method comprises the following steps: 1) preparation of construction before boring; 2) in the process range of goaf, arrange filling grout hole, measure the setting-out drilling hole position in goaf; 3) cover layer to goaf and rock section are crept into; 4) boring in goaf is rinsed; 5) by boring, grouting treatment is carried out in inside, goaf: it is the Cement fly ash of the high fly ash of 0.8:1 or 1:1, wherein cement that grouting adopts water-solid ratio: the weight ratio of flyash is 0.15:0.85; 6) grouting quality inspection. The construction method of filling grouting is processed in a kind of goaf provided by the invention, adopt boring grouting method to efficiently solve the engineering geological problems in goaf, to stop the further inbreak of upper overlying strata body, prevent surface subsidence or subside, ensure the security of operation through building on goaf.
Description
Technical field
The present invention relates to a kind of goaf and process the construction method of filling grouting, belong to the base of hydraulic engineering and corresponding engineeringPlinth is processed and geological hazard control field.
Background technology
Along with greatly developing of national basis construction, engineering addressing and geological conditions become increasingly complex, and a large amount of mineral productsExploitation makes Goaf Area area increasing. And a series of environmental geotechnical that cause due to gob collapse interrogateTopic, as land subsidence, road cracking, the minimizing etc. of ploughing, often has a strong impact on the people's normal life, causes great economy to damageLose.
The experience of building engineering, especially hydraulic engineering both at home and abroad on goaf is little, without ripe construction experience, andDo not have relevant Regulations and the technical bid will definitely reference. Route is large hydraulic engineering, and engineering is in safetyAspect requires high, and while carrying out engineering addressing, Route Henan Province Yuzhou section cannot be avoided goaf.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of goaf and processes the construction method that filling is in the milk, and adopts and boresHole grouting method efficiently solves the engineering geological problems in goaf, to stop the further inbreak of upper overlying strata body, prevents groundSedimentation or subside, ensures the security of operation through building on goaf.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: filling grouting is processed in a kind of goafConstruction method, the method comprises the following steps:
1) preparation of construction before boring;
2) in the process range of goaf, arrange filling grout hole, measure the setting-out drilling hole position in goaf;
3) cover layer to goaf and rock section are holed;
4) boring in goaf is rinsed;
5) by boring, grouting treatment is carried out in inside, goaf: grouting employing water-solid ratio is that the height of 0.8:1 or 1:1 is mixed powderThe Cement fly ash of coal ash, wherein cement: the weight ratio of flyash is 0.15:0.85;
6) grouting quality inspection.
Step 3) in, for the different lithology feature of coal mined-out area overlying strata, adopt respectively alloy bit, diamondThin drilling bit, full section alloy or diamond bit, and adopt bentonite slurry as circulation fluid retaining wall.
Step 5) in, adopt ground slurry preparing station system to join Cement fly ash, adopt pressure grout method to be in the milk.
Grouting obstruction mode before grouting is used " aperture sealing method " and " like ring flange method ".
The construction method of filling grouting is processed in a kind of goaf provided by the invention, and beneficial effect is as follows:
1,, in the process range of goaf, arrange filling grout hole, the space by slip casing by pressure normal direction rock stratum and adopt skyDistrict's fracture belt, caving zone and adopt empty part and inject the slurry material with better filling performance and bonding capacity, after slurries sclerosisFormation has the supporter of some strength, and overlying strata body on goaf is formed to supporting role, to stop the further of upper overlying strata bodyInbreak, prevents surface subsidence or subsides, and ensures the security of operation through building on goaf (structures); Adopt boring slip casting sideMethod efficiently solves the engineering geological problems in goaf, to stop the further inbreak of upper overlying strata body, prevents surface subsidence or collapsesFall into, ensure the security of operation through building on goaf.
2,, for the different lithological characteristic of overburden of the goaf (loam layer, boulder bed, rock section etc.), adopt respectively alloy to boreHead, diamond thin-wall drill bit, full section alloy or diamond bit, and be aided with bentonite slurry as circulation retaining wall liquid, effectivelySolved the rapidly and efficiently problem of pore-forming of goaf coal measure strata.
3, filling grouting adopts the Cement fly ash of high fly ash, and doping quantity of fly ash, up to 85%, not only reducesThe cost of raw material, solved preferably again the depression stable problem of overlying strata body on goaf.
4,, according to the large feature of goaf filling grouting amount, adopted the ground slurry preparing station water distribution processed that slurrying efficiency is higherMud pulverized fuel ash slurry, has met the filling successional requirement of being in the milk, and has improved filling grouting construction work efficiency, and has guaranteed fillingThe construction quality of grouting.
5, it is easy to operation that mode is blocked in the grouting before grouting: the effect of orifice tube of having held concurrently of borehole wall-protection sleeve pipe, and directConnecting aperture locking device can be in the milk, easy to operation, and has saved to a certain extent material and process costs.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is construction flow chart of the present invention.
Detailed description of the invention
A construction method for filling grouting is processed in goaf, and the method is made up of following steps:
1) preparation of construction before boring, preparation is as follows:
1-1) build operation platform: adopt the welding of channel-section steel or I-steel to form the larger operation platform of supporting surface, and with brillThe frame entirety bolt of machine connects, the construction stability requirement when guaranteeing high mast operation.
1-2) rig configuration: the buried depth of coal mine gob is generally larger, and complex formation, therefore that boring is generally selected is movingRevolution or down-the-hole drill that power 11KW is above, moment of torsion is not less than 1110N.m.
1-3) drilling tool configuration: for the different lithology spy of overburden of the goaf (loam layer, boulder bed, rock section etc.)Point, should configure respectively alloy bit, diamond thin-wall drill bit, full section alloy or diamond bit some; Drilling rod bores by actualThe different size such as φ 42mm, φ 50mm need to be selected in hole, adopts lock Threaded Connector Coupling.
1-4) grouting equipment configuration: goaf grouting amount is large and the continuous grouting time is generally longer. Therefore, require groutingThe low-grade theoretical displacement of pump is not less than 80L/min and possesses multistep speed regulation function, and in practice of construction, multiselect is filled with by BW250/50 typeStock pump is as main force's type.
1-5) pulp feeding system processed: because goaf is larger for slurry demand, pulping equipment adopts with automatic control systemThe unified system of large-scale ground mixing plant is joined, and is delivered to each operation side by terminal; Consider high fly ash cement groutThe feature of poor fluidity, very fast, the easy plugging of precipitation, slurry water gray scale (weight ratio) generally should not be richer than 0.6:1.
2) in the process range of goaf, arrange filling grout hole, measure the setting-out drilling hole position in goaf.
3) cover layer to goaf and rock section are holed, and step is as follows:
3-1) drilling construction order: the periphery hole in territory, subdrilling goaf to be processed, then advances to middle part, simultaneously graduallyOn order hole, point two orders are carried out, subdrilling I order hole, then bore II order hole;
3-2) boring location: drilling hole position, according to design cloth hole principle, adopts total powerstation or GPS, is combined with steel ruler and putsSample;
3-3) drilling hole array pitch: according to industrial experimentation situation, detect slurries range of scatters, determine that filling drilled grout holeExcellent hole array pitch, generally selects 18～22m, and largest hole is apart from being no more than 30m.
3-4) boring hole depth: reach the requirement of design hole depth, specifically, to occur significantly falling to bore after phenomenon in boring procedure, continueContinuous creeping into passing seat earth 1～1.5m, to guarantee that being subject to fill with section fully discloses.
3-5) boring aperture: it is differential that perforate aperture should be greater than two, aperture, whole hole, often adopts φ 110～130mm, is drilled into darkEnter after basement rock 5m, reducing is that φ 76～91mm continues to creep into, until reach whole hole depth.
3-6) boring hole deviation: because array pitch between filling grout hole is generally larger, and boring be as the criterion to drill goaf, boreHole deviation controlling is less demanding, but should be before boring perforate or rear strict correction rig vertical shaft angle in place again, ensures boringPerpendicularity requirement.
3-7) protection casing is buried underground: boring perforate is to going deep into after basement rock 5m, and the protection casing of imbedding φ 108～127mm (canDouble as grout pipe), quantitatively inject the striaght cement slurries build-in pin of 0.5:1, anchorage length must not exceed this basement rock segment length. For addingThe drilling construction progress of fast grout compartment, can add the accelerator of cement weight 1%～3%, accelerates sleeve pipe build-in cement groutSolidify.
3-8) drilling method: goaf boring generally (comprises bending through loam layer, boulder bed, rock section from top to bottomBand, fissure zone, caving zone), for different stratum characteristics, drilling method can adopt following several mode to carry out:
1. loam layer creeps into employing alloy bit, as three pages of brills, using bentonite slurry as circulation fluid retaining wall, middle and slow speed of revolutionCreep into;
2. boulder bed creeps into employing diamond thin-wall drill bit, and using bentonite slurry as circulation fluid retaining wall, the slow-speed of revolution is crept into;
3. general full section drill bit, long drill pipe, the high speed of adopting of rock section crept into, and adopts clear water as circulation fluid, midwayNeed not carry and drill through core, reduce and added drilling rod number of times in drilling process, can greatly improve drilling efficiency; Meet the higher quartz of intensityWhen sandstone formation, should carry boring and use diamond thin-wall drill bit instead and creep into.
4) boring in goaf is rinsed:
The boring mud of loam layer, boulder bed, outside portalling, enters in mud overfall pond by the suspension effect band of bentonite slurryPrecipitation is discharged; Rock section adopts full section drill bit to creep into, and can strengthen the flow of clear water flushing liquor in boring procedure, and rock dust is gone outOutside hole; Hole behind whole hole, do not carry boring and continue to rinse and be no less than 10min with pressure clear water, by the charges in rock fracture, spaceTake away, so that slurries range of scatter strengthens when slip casting.
5) grouting before grouting is blocked:
Grouting obstruction mode can adopt " aperture sealing method " and " like ring flange method " two kinds:
5-1), before grouting, mechanical type disabler is blocked in protection casing, or adopts orifice closure and protection casingDirectly connect. Adopt this obstruction mode, simple and easy to do, but the rear sleeve that is in the milk has for a long time been difficult for pulling out.
5-2) boring finish after, rise pull out protection casing, by one end with reducing place in hand-hole under the Grouting Pipe of flange pallet,The reverse screwed connection of slip casting bottom tube, so that after slip casting finishes, can forward propose top Grouting Pipe, reuses; ThenTo the dense cement grout that between hole wall and Grouting Pipe, quantitatively injected water gray scale is 0.5:1, by Grouting Pipe and hole wall build-in, build-in heightAlso be no more than the basement rock length of this section.
6) by boring, grouting treatment is carried out in inside, goaf:
6-1) total sequence of construction:
Grout hole is by the incline direction in goaf, grout hole and the structure of the gob floor absolute altitude lower position of first constructingThe grout hole at position, more along inclined direction from low to high, constructed to center deployment by limit portion. On order hole, point two orders are entered simultaneouslyOK, first fill with I order hole, then fill with II order hole, to form the filling grouting effect of " enclose, squeeze, press ".
6-2) grouting material:
It is the Cement fly ash (cement: fine coal of the high fly ash of 0.8:1 or 1:1 that filling grouting adopts water-solid ratioAsh=0.15:0.85). Wherein cement adopts P.O42.5 level Portland cement, and flyash adopts II level flyash. GenerallyMore than 0.60.
6-3) grouting line arrangement:
Overfall pipeline should not be arranged on grouting pump exit, should lengthen pipeline to aperture overfall, while preventing from pouring into for a long time,Stop up pulp-inlet pipe road, cause unnecessary trouble; Meanwhile, a check-valves should be installed before the return pipe of aperture, to be controlled at fillingThe slurry starting stage is when passive state, prevents slurry reflux and stops up overfall pipeline.
6-4) grouting method
Filling grouting adopts " pure pressure type, continuous grouting method ", in the time that grouting amount is large or crack, goaf, space are larger,Aperture adds funnelform sand slinging machine, with slurries by sand or slag band hand-hole.
6-5) grouting segment length: grouting segment length is that segment length to whole hole after reducing, gos deep into extremely holing eventually after basement rock 5mThat segment length in hole.
6-6) grouting pressure control: grouting flow and the grouting pressure of filling grouting are negative correlativing relation, i.e. filling processMiddle grouting is substantially taking the perfusion of gravity flow (pressure is as 0MPa) state, and last 5～30min is in the milk flow rapid drawdown to 10L/min,Grouting pressure rises to 1.0～1.5MPa from 0MPa.
Therefore, grouting pressure control should send special messenger to monitor, and in the time that pressure exceedes 0.3MPa, reminds workmen immediatelyCheck-valves is opened, prevented the generation of booster phenomenon. On the other hand, in the perfusion state with no pressure of last stage, for avoiding slurriesBy overfall pipeline blockage, in filling process, should close check-valves.
6-7) grouting ending standard: the ending phase of considering to be in the milk is lasted shorter, strict ending standard and is not difficult to reach.Therefore, can adopt when aperture pressure is in the force value (1.0MPa) of regulation, pump amount is less than 10L/min, stablizes 10～15min,Can finish the filling grouting construction in this hole.
6-8) grouting record: to adopt grouting automatic recording instrument to be recorded as master, consider that filling grouting lasts longer, in constructionUnder on-the-spot complicated rugged environment condition,, inevitably can there is signal interruption, printout not in recorder long-playThe fault such as complete, now, should adopt hand-kept filling process immediately.
7) grouting quality inspection:
7-1) test mode: carry out the inspection of filling grouting quality after corresponding units engineering mortar depositing construction finishes 7 days, checkMode, taking geology CT boring scanning and mud jacking inspection as main, is auxiliary in conjunction with boring and coring and grouting data Analysis on Results simultaneously, comprehensiveClose judgement grouting effect.
7-2) inspection opening is arranged: every 40～50 holes are divided into a unit, and each unit arranges two inspection openings, adjacentTwo pitchs of holes should be controlled within the scope of the accuracy of detection of CT scanner, are generally 25～30m;
7-3) mud jacking inspection: adopt the Cement fly ash continuous grouting of water-solid ratio 0.8:1 or 1:1, ending standard is sameFilling grouting requirement. After mud jacking finishes, inject dry ash consumption with inspection opening single hole and carry out two class comparisons, the one, be less than this unit flatAll 25% of single hole dry ash consumption, think that slip casting effect is better, the 2nd, with inspection opening single hole dry ash consumption control (according toGrouting data is determined), if be less than this value, think that slip casting effect is better, inspection opening mud jacking meets above-mentioned any one standard,Think that element project grouting quality is qualified.
7-4) consider that coal mine gob Overburden Rock Failure form is generally " trizonal ", filling grouting treatment scope is mainly adoptsEmpty part, caving zone and fracture belt. Therefore, inspection opening is got core and only the goaf section of the above 50m scope of whole hole depth is got to core, rockCore taking rate is not less than the regulation of technical requirement on design.
7-5) for the underproof unit of quality examination, according to geology CT scan, mud jacking inspection, grouting effect Information integrationAnalyze, determined whether to need supplementary irrigation or supplement to check by management or designing unit.
8) special circumstances processing:
8-1) boring bit freezing, bury drills phenomenon
Coal measure strata is taking soft mud stone as main, and sandstone mostly is argillaceous agglutination, adopts the construction method of full-face drilling, hasA large amount of rock dust produce, and " bury drills " phenomenon very easily occurs; " three bands " distributes obviously, and cranny development, falls piece phenomenon and happen occasionally, bit freezingThe phenomenon frequency also can be higher.
While there is this situation, focus on obviate: the one, adopt the larger slewing drilling machine of moment of torsion, can effectively avoidThe generation of bit freezing, bury drills phenomenon; The 2nd, in drilling process, strengthen flushing fluid and flushing pressure, in time rock dust is gone out to holeOutward; The 3rd, it is differential that the caliber of protection casing should be greater than two, aperture, whole hole, while being convenient to occur drilling accident, extracts processing.
8-2) earth's surface grout phenomenon
Open while filling, occur earth's surface grout phenomenon, wash boring immediately, ensures that perfusion channel is unimpeded, then re-startsGrouting processing; Longer for infusion time, or the earth's surface grout phenomenon of boost phase appearance, the perfusion of step-down immediately, along spillagePoint is taked " earth bag or sandbag ballast " grouting measure; When ballast grouting is still invalid, after pointing out underflow, treats spillage solidifying being no less than8h, then cleaning bottom of hole is filled with again.
8-3) string hole phenomenon
In goaf grouting process, when pour in a hole, close on around sometimes hole, even, every a hole, there is holeInterior " grout leaking " phenomenon. While there is this phenomenon, gone out after underflow wait ganging up hole, take two holes or porous to pour into simultaneously.
8-4) midge phenomenon not
In the filling process of goaf, part gets into the reserved coal column in colliery, does not connect with coal mine gob; Part is boredThe position that subsides to coal mine gob, and the situation of subsiding is more serious, and poor with the connectivity of adjacent regions, there are indivedual holes notEat the phenomenon of slurry. For this phenomenon, can take grouting pressure suitably to strengthen, the plane of weakness at the position that subsides is punctured and strengthenedConcrete castability; While can not pressure puncturing, need to pay close attention to the perfusion situation of periphery hole, take appropriate measures and guarantee that the grouting of periphery hole is continuousProperty, to increase its range of scatter.
Claims (4)
1. a construction method for filling grouting is processed in goaf, it is characterized in that the method comprises the following steps:
1) preparation of construction before boring, specific as follows;
1-1) build operation platform: adopt the welding of channel-section steel or I-steel to form the larger operation platform of supporting surface, and with rigFrame entirety bolt connects, the construction stability requirement when guaranteeing high mast operation,
1-2) rig configuration: select power 11KW is above, moment of torsion is not less than 1110N.m revolution or down-the-hole drill,
1-3) drilling tool configuration: for the different lithology feature of overburden of the goaf, configuration alloy bit, diamond core drill bitHead, full section alloy or diamond bit are some; Drilling rod need to be selected the different size such as φ 42mm, φ 50mm by reality boring,Adopt lock Threaded Connector Coupling,
1-4) grouting equipment configuration: the low-grade theoretical displacement of grouting pump is not less than 80L/min and possesses multistep speed regulation function,
1-5) pulp feeding system processed: because goaf is larger for slurry demand, pulping equipment employing is large-scale with automatic control systemThe unified system in ground slurry preparing station is joined, and is delivered to each operation side by terminal; Slurry water ash weight ratio is not richer than 0.6:1,
2) in the process range of goaf, arrange filling grout hole, measure the setting-out drilling hole position in goaf;
3) cover layer to goaf and rock section are holed, specific as follows;
3-1) drilling construction order: the periphery hole in territory, subdrilling goaf to be processed, then advances to middle part, gradually simultaneously in orderKong Shangfen two orders are carried out, subdrilling I order hole, then bore II order hole,
3-2) boring location: drilling hole position, according to design cloth hole principle, adopts total powerstation or GPS, is combined with steel ruler setting-outCan,
3-3) drilling hole array pitch: according to industrial experimentation situation, detect slurries range of scatter, determine the optimum hole of filling drilled grout holeArray pitch, is 18～30m,
3-4) boring hole depth: reach the requirement of design hole depth, specifically to occur significantly falling to bore after phenomenon in boring procedure, continue to boreProceed to through seat earth 1～1.5m, to guarantee that being subject to fill with section fully discloses,
3-5) boring aperture: it is differential that perforate aperture should be greater than two, aperture, whole hole, often adopts φ 110～130mm, is drilled into and gos deep into baseAfter rock 5m, reducing is that φ 76～91mm continues to creep into, until reach whole hole depth,
3-6) boring hole deviation: because array pitch between filling grout hole is generally larger, and boring be as the criterion to drill goaf, drilling holeTiltedly control less demanding, but should be before boring perforate or rear strict correction rig vertical shaft angle in place again, ensure hanging down of boringThe requirement of straight degree,
3-7) protection casing is buried underground: boring perforate, to going deep into, after basement rock 5m, imbedding the protection casing of φ 108～127mm, is quantitatively notedThe striaght cement slurries build-in pin that enters 0.5:1, anchorage length must not exceed this basement rock segment length, for accelerating the drilling construction of grout compartmentProgress, can add the accelerator of cement weight 1%～3%, accelerates solidifying of sleeve pipe build-in cement grout,
3-8) creep into being chosen as of drilling method:
1. loam layer creeps into employing alloy bit, and using bentonite slurry as circulation fluid retaining wall, middle and slow speed of revolution creeps into;
2. boulder bed creeps into employing diamond thin-wall drill bit, and using bentonite slurry as circulation fluid retaining wall, the slow-speed of revolution is crept into;
3. rock section adopts full section drill bit, long drill pipe, high speed to creep into, and adopts clear water as circulation fluid, need not carry brill midwayGet core, reduced and added drilling rod number of times in drilling process, can greatly improve drilling efficiency; Meet the higher quartzy sandstone stratum of intensityTime, should carry boring and use diamond thin-wall drill bit instead and creep into;
4) boring in goaf is rinsed;
5) by boring, grouting treatment is carried out in inside, goaf; Specific as follows:
5-1) sequence of construction:
Grout hole is by the incline direction in goaf, grout hole and the structure position of the gob floor absolute altitude lower position of first constructingGrout hole, more along inclined direction from low to high, constructed to center deployment by limit portion, on order hole, point two orders are carried out simultaneously, firstFill with step 3-1) the I order hole of boring, then fill with II order hole,
5-2) grouting material:
It is the Cement fly ash of the high fly ash of 0.8:1 or 1:1, wherein cement that filling grouting adopts water-solid ratio: fine coalThe weight ratio of ash is 0.15:0.85; Wherein cement adopts Portland cement, and flyash adopts II level flyash,
5-3) grouting line arrangement:
Overfall pipeline is arranged on grouting pump exit, should lengthen pipeline to aperture overfall, while preventing from pouring into for a long time, stops up into slurryPipeline, causes unnecessary trouble; Meanwhile, a check-valves should be installed before the return pipe of aperture, to be controlled at the initial rank of groutingSection is when passive state, prevents slurry reflux and stops up overfall pipeline;
5-4) grouting method
Filling grouting adopts " pure pressure type, continuous grouting method ", in the time that grouting amount is large or crack, goaf, space are larger, in apertureAdd funnelform sand slinging machine, with slurries by sand or slag band hand-hole,
5-5) grouting segment length: grouting segment length be that segment length in whole hole extremely after reducing, i.e. step 3-5) in go deep into after basement rock 5m extremelyHole that segment length in whole hole,
5-6), when aperture pressure is in the force value of regulation, pump amount is less than 10L/min, stablizes 10～15min, finishes filling of this holeFill out grouting construction,
6) grouting quality inspection.
2. the construction method of filling grouting is processed in a kind of goaf according to claim 1, it is characterized in that: step 3)In, for the different lithology feature of coal mined-out area overlying strata, adopt respectively alloy bit, diamond thin-wall drill bit, Quan DuanFace alloy or diamond bit, and adopt bentonite slurry as circulation fluid retaining wall.
3. the construction method of filling grouting is processed in a kind of goaf according to claim 1 and 2, it is characterized in that: step5) in, adopt ground slurry preparing station system to join Cement fly ash, adopt pressure grout method to be in the milk.
4. the construction method of filling grouting is processed in a kind of goaf according to claim 1 and 2, it is characterized in that: groutingFront grouting obstruction mode is used " aperture sealing method ".
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| CN110439463A (en) * | 2019-07-31 | 2019-11-12 | 江河水利水电咨询中心 | Mined-out Area control injected hole pore-creating technique |
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