CN104847379A - Method for reinforcing working surface bottom plate by Ordovician limestone top grouting - Google Patents
Method for reinforcing working surface bottom plate by Ordovician limestone top grouting Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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Abstract
The invention belongs to the technical field of mine Ordovician limestone aquifer grouting transformation, and relates to a method for reinforcing a working surface bottom plate by Ordovician limestone top grouting. According to the method, on the basis of analyzing the feasibility of the Ordovician limestone top grouting, a working surface, threatened by Ordovician limestone water, of lower group coal is analyzed, and a region of the working surface bottom plate transformed by the Ordovician limestone top grouting is determined; by starting from a water bursting coefficient, the Ordovician limestone top grouting depth is determined; the Ordovician limestone top grouting condition of the lower group seam is analyzed; concrete requirements are made for the grouting transformation work of each coal seam; then, a design of a grouting inclined hole three-stage sleeve and a principle of uniformly forming drill holes on the working surface are adopted, and the effectiveness and the pertinence of the Ordovician limestone aquifer grouting are ensured; finally, various methods are adopted for evaluating the grouting effect in a combined way; a region threatened by the Ordovician limestone water can be divided in time; the Ordovician limestone grouting thickness can be determined in time; the working surface bottom plate is reinforced through grouting; the safe mining of the working surface threatened by the Ordovician limestone water is ensured; the output of a resource-exhausted mine is improved; and the service life of the mine is prolonged.
Description
Technical field:
The invention belongs to mine aquifer in Ordovician limestone grout transformation technical field, relate to the technique of a kind of Austria grey top grout transformation floor undulation, particularly the method for a kind of Austria grey top grouting and reinforcing floor undulation.
Background technology:
Along with the increase of North China type coalfield mining depth in recent years, the hydraulic pressure of mine pressure, aquifer in Ordovician limestone is also in remarkable increase, grey water bursting coefficient difficult to understand exceedes threshold, the threat of the direct gushing water of ash difficult to understand is more and more large, the harm of grey gushing water difficult to understand can not guarantee safety by prevention merely, the research to the positive Treatment process of ash difficult to understand must be carried out, just can guarantee that Deep Mine is subject to Ordovician karst water to threaten the safe working of coal reserves.
Following evolution is mainly experienced in improvement for mine floor karst water: (1) coalfield large-scale industry outflow test technology, take Feicheng Coalfield as representative, successively point two phases in east, coalfield, mine of western implements many grasses and combines the large-scale industry outflow test that carries out with down-hole and integrated exploration is tested, for the hydrogeological conditions division of mine provides foundation.Through discharging water, experimental study finds out regional hydrogeological conditions; (2) mining area thin layer limestone grout transformation technology, thin layer limestone slurry injection technique is from ground punching, ground cement injection starts, arrive down-hole again to punch, underground water-injection mud, finally develops into down-hole punching, the process of ground note clay cement grout, achieve mine water to put prevention first to the spanning development of actively administering, this technology obtains promotion and application at North China type coalfield; (3) mechanism of water inrush research research, the research being the Water Inrush mechanism of representative with " leptophragmata water layer Water Inrush mechanism and prediction "." centered by rock shifting movement " mine theory is set out, further investigation stope tomography activating mechanism under action of underground; Propose working seam base plate " lower four bands " Partition Theory, analysis seat earth water barrier is original leads high Forming Mechanism, proposes the stress Dissolution Mechanism of rock; According to stope sill stress distribution feature, study of rocks crack is on the impact of base plate peak stress angle of propagation; Propose the new method of gushing water probability index method prediction Water Inrush, develop Water Inrush prediction application software; (4) the grey top grout transformation technology exploration stage difficult to understand, in thin layer limestone grout transformation technical foundation, the features such as inhomogeneity are grown in conjunction with deep grey high hydraulic pressure difficult to understand, Karst Fissures, be combined with theoretical research by field trial, exploration carries out grout transformation floor undulation to the grey top of Austria.
At present, the water prevention guiding theory of " five ashes to control, rely mainly on prevention by ash difficult to understand " can not meet the needs of Deep Mining safety in production, must carry out active administer ash difficult to understand.Therefore, seek a kind of method based on slurry injection technique reinforcement face, Austria grey top base plate, under Deep Mining seriously threatens actual conditions by Ordovician karst water, at home and abroad on water prevention achievement in research basis, especially on thin layer limestone grout transformation experiential basis, by practical exploration for many years, theory with practice, form the method for grey top difficult to understand grout transformation floor undulation, utilize the method can divide in time by Ordovician karst water threatening area, determine grey top slip casting thickness difficult to understand, by a series of grout transformation floor undulation working link, final guarantee threatens work plane safe working by Ordovician karst water, improve resource exhaustion ore deposit well yield, extend mine service-life.
Summary of the invention:
The object of the invention is to the shortcoming overcoming prior art existence, seeking to design provides a kind of method based on slurry injection technique reinforcement face, Austria grey top base plate, first on analysis grey top slip casting feasibility basis difficult to understand, analyze lower group coal and threaten work plane by Ordovician karst water, determine grout transformation floor undulation region, grey top difficult to understand; From water bursting coefficient, determine the grey top slip casting degree of depth difficult to understand, and analyze lower group coal seam Ao Hui top slip casting situation, specific requirement is made to the grout transformation work of each coal seam; Then adopt the design of slip casting inclined hole three grades of sleeve pipes, work plane is evenly arranged the principle of boring, guarantees grey top difficult to understand aquifer slip casting validity and specific aim; Finally adopt a series of activities such as advanced grout transformation technique and multiple method association evaluation slip casting effect, to ensure the quality problems of grey top difficult to understand grouting and reinforcing floor undulation, guarantee work plane energy safety coal extraction.
To achieve these goals, the present invention specifically comprises the following steps:
(1), the feasibility of grey top slip casting difficult to understand is analyzed: aquifer in Ordovician limestone is the multi-section multi-layer aquifer with layer control, structure control and rhythmic nature, and each water-bearing interval has relative independentability and inter-relation; Wherein grey roofing upper section 0 ~ 20m difficult to understand is relative aquitard section, and wherein 0 ~ 10m scope is relative water resisting layer section, forms the cap rock needed for the grout transformation of grey top difficult to understand; Grey top stage casing 20 ~ 40m difficult to understand is relative strong aquifer section, is the interval of interest of Austria's grey top grout transformation; The relative aquitard section of grey top hypomere 40 ~ 150m difficult to understand to be thickness be 90m is the bottom needed for Austria's grey top grout transformation interval of interest;
(2) region of grey top difficult to understand grouting and reinforcing floor undulation, is determined: the floor undulation possessing one of following condition is transformed: (a) is according to " mine geological hazards regulation ": base plate is by structure destruction location work plane grey water bursting coefficient difficult to understand more than 0.06MPa/m, and work plane grey water bursting coefficient difficult to understand in normal location is more than 0.1MPa/m; B () work plane grey water bursting coefficient difficult to understand is no more than " mine geological hazards regulation ", but be in hydrous fluids and strong runoff band, and comprehensive analysis has grey gushing water danger difficult to understand; C () is visited by existing physical prospecting, probing, lane or is taken out/outflow test, detect that floor undulation exists the vertical passage abnormal belt of structurally fractured zone, leaking crevice belt, water barrier thinning belt, karst collapse col umn, Ordovician karst water supply thin layer limestone, water-resisting floor can not resist the actual hydraulic pressure value of thin layer limestone and aquifer in Ordovician limestone;
(3), the grey top slip casting degree of depth difficult to understand is determined:
Slip casting degree of depth formula is calculated according to work plane grey water bursting coefficient difficult to understand:
in formula, T
1for the grey water bursting coefficient difficult to understand of the work plane before reinforcing, unit is MPa/m; T
2for the grey water bursting coefficient difficult to understand of the work plane after reinforcing, unit is MPa/m; M
1for reinforcing leading face water-resisting floor thickness, unit is m; Recycling formula (1), calculates lower group of coal each working face of coal seam base plate grey top slip casting degree of depth difficult to understand respectively in conjunction with work plane grey water bursting coefficient difficult to understand and critical absolute altitude; From first floor coal, after first floor coal mining completes, use existing both-end shutoff side leakage device in-site measurement first floor coal seam floor collapse dept, for exploitation second layer coal provides grout transformation data, by that analogy, terminate to last one deck coal;
(4), inlet well: the inclination angle of inlet well changes between 25 ~ 35 degree, in same place, difference moves towards the principle adopting " repeatedly perforate ", it is constant that the movement reducing rig brings, use existing " three grades of sleeve pipes " structure to carry out inlet well, guarantee the validity of grey top slip casting difficult to understand; Boring disclose and through five grey aquifers time, the hydraulic pressure in five grey aquifers, the water yield slip casting is carried out to this aquifer be measured, prevent five grey aquifers from impacting Austria's grey top slip casting;
(5), slip casting: after clay cement grout is completed by slip casting station by ground, by underground transportation pipeline, clay cement grout is transported to the work plane of corresponding grouting and reinforcing, by grouting pump, the base plate work of underground grouting reinforcement face is carried out to the boring of having constructed, in slip casting process, adopt slip casting work plane to divide order, single hole segmenting slip casting, the method that single hop continuous grouting combines with interval slip casting, slip casting work plane is close after adopting and first dredging, the method of middle interpolation, single inlet well first carries out slip casting to five ashes, extend to grey top slip casting difficult to understand again, a hole section carries out continuous grouting, interval slip casting during discovery down-hole running pulp, grouting pressure is 2 ~ 5 times of slip casting aquifer hydraulic pressure, grouting pump amount is determined according to the development degree of aquifer Karst Fissures, grouting serous fluid density is 1.12 ~ 1.18g/cm
3,
(6) detection of grouting effects and evaluation: adopt existing probing or mine geophysics detection method to detection of grouting effects, makes emphasis to the region of complex structure and detects; After detection of grouting effects completes, utilize the change of existing probing method inspection eye water yield size to slip casting effect evaluation, utilize mine geophysics result map simultaneously, before and after contrast slip casting, physical property changes and makes slip casting effect evaluation.
The present invention compared with prior art, can divide by Ordovician karst water threatening area in time, determines grey top slip casting thickness difficult to understand, by grouting and reinforcing floor undulation, ensure to threaten work plane safe working by Ordovician karst water, improve resource exhaustion ore deposit well yield, extend mine service-life.
Accompanying drawing illustrates:
Fig. 1 is the present invention's grey cap rock layer watery sectional drawing difficult to understand.
Fig. 2 is the present invention grey top inlet well design profile figure difficult to understand.
Fig. 3 is the present invention ore deposit 8804 work plane drilling design plan view.
Fig. 4 is 101002 floor undulations grey top resistive rate slice map difficult to understand before the slip casting of the present invention ore deposit.
Fig. 5 is 101002 floor undulations grey top resistive rate slice map difficult to understand after the slip casting of the present invention ore deposit.
Detailed description of the invention:
Below by embodiment, also the invention will be further described by reference to the accompanying drawings.
Embodiment:
The present embodiment is to Austria's ash top grout transformation work plane in certain mining area, and its detailed process is:
(1), the feasibility analysis of grey top slip casting difficult to understand: aquifer in Ordovician limestone is not the aquifer that tradition is thought, but there is the multi-section multi-layer aquifer of the features such as layer control, structure control, rhythmic nature, each water-bearing interval has relative independentability and inter-relation, grey top difficult to understand mainly refers to middle Ordovician limestone peak-to-peak group epimere, peak-to-peak group epimere thickness 154.68m, according to Xi'an Mei Ke institute results of study in 1986 and actually detect situation, be divided into three intervals, as shown in Figure 1:
Grey roofing upper section (0 ~ 20m) difficult to understand is relative aquitard section, and wherein 0 ~ 10m scope is relative water resisting layer section, is formed " cap rock " needed for the grout transformation of grey top difficult to understand; Stage casing, grey top (20 ~ 40m) difficult to understand is relative strong aquifer section, is the best interval of interest of Austria's grey top grout transformation; Grey top difficult to understand hypomere (40 ~ 150m) scope is the relative aquitard section that thickness is about 90m, " bottom " needed for Austria's grey top grout transformation interval of interest, to sum up analyze, grey top difficult to understand possesses the good geological conditions of grout transformation, for the grey top of Austria provides physical property condition gradually.
(2), grout transformation floor undulation region, grey top difficult to understand is determined:
Grey top difficult to understand grout transformation technology will could use under certain conditions, this mining area-as possess one of following condition adopt grey top difficult to understand grout transformation floor undulation:
A () " mine geological hazards regulation " base plate is by structure destruction location work plane grey water bursting coefficient difficult to understand more than 0.06MPa/m, work plane grey water bursting coefficient difficult to understand in normal location is more than 0.1MPa/m;
Though b () work plane grey water bursting coefficient difficult to understand is no more than " mine geological hazards regulation ", be in hydrous fluids and strong runoff band, comprehensive analysis has grey gushing water danger difficult to understand;
C () is visited by physical prospecting, probing, lane, is taken out the means such as (putting) water test, find out that floor undulation exists the abnormal belt such as vertical passage of structurally fractured zone, leaking crevice belt, water barrier thinning belt, karst collapse col umn, Ordovician karst water supply thin layer limestone, water-resisting floor can not resist the actual hydraulic pressure value of thin layer limestone and aquifer in Ordovician limestone;
Possesses the work plane of above condition, during grey top grout transformation difficult to understand, boring, carrying out grout transformation through Xian Duixujia village limestone time base plate thin layer limestone (Xu Jia village limestone), is then extended deep to grey top difficult to understand and carries out grey top difficult to understand grout transformation by difficult to understand grey grout transformation boring.
(3), the grey top difficult to understand grout transformation degree of depth is determined:
By Ordovician karst water head pressure p before and after grout transformation
1, p
2formula:
Bring in water bursting coefficient formula:
Obtain grey top grout transformation degree of depth M difficult to understand
changedesign formulas:
Wherein, formula (1) and (2) middle H are work plane absolute altitude, m; H is Ordovician karst water position absolute altitude, m; M
1for transformation noseplate impermeable layer thickness, m; M
changefor Austria's grey top transformation degree of depth (namely increasing impermeable layer thickness after transformation), m; T in formula (4)
1for transforming front water bursting coefficient, MPa/m; T
2for transforming rear water bursting coefficient, MPa/m; The slip casting degree of depth bottom Austria's ash utilizing formula (4) to analyze 7,8,9,10 layers of coal respectively, according to work plane grey water bursting coefficient difficult to understand and critical absolute altitude computational chart (table 1), critical absolute altitude-420m during 7 coal T=0.06MPa/m, critical absolute altitude-600m during T=0.08MPa/m, critical absolute altitude-800m during T=0.1MPa/m.
This mining area maximum mining depth about-450m, exploitation absolute altitude is in safe range, consider that the impermeable layer thickness of mining area 7 coal is large, mining depth grey water bursting coefficient difficult to understand is less than 0.08MPa/m, and grey top difficult to understand grout transformation hole depth is large, the features such as difficulty of construction is large, therefore do not implement grey top difficult to understand grout transformation to 7 coals, main enforcement five grey grout transformation and Draining hook water control measures.
According to work plane grey water bursting coefficient difficult to understand and critical absolute altitude computational chart (table 1), critical absolute altitude-235m during 8 coal T=0.06MPa/m, critical absolute altitude-340m during T=0.08MPa/m, critical absolute altitude-450m during T=0.1MPa/m, three sections can be divided into carry out grout transformation according to above critical absolute altitude, in-230 ~-340m scope, must the slip casting degree of depth be 22.4m by formula (4);-340 ~-450m slip casting degree of depth is 44.8m; When 8 layers of coal work plane grey water bursting coefficient difficult to understand are greater than 0.1 (MPa/m), grey top difficult to understand needs the grout transformation degree of depth need determine according to actual water bursting coefficient size calculating;
Consider that 9,10 coal seam spacing are little, be similar to separate zone production, therefore, the grey top difficult to understand grout transformation degree of depth calculates by 10 layers of coal, show that 10 coals are 22.4m at-140 ~-220m slip casting thickness by formula (4); In-220 ~-300m scope, slip casting thickness is 31.36m; 9, when 10 layers of coal work plane grey water bursting coefficient difficult to understand are greater than 0.1 (M Pa/m), grey top difficult to understand needs the grout transformation degree of depth need determine according to actual water bursting coefficient size calculating.
Table 1: work plane grey water bursting coefficient difficult to understand and critical absolute altitude computational chart
After day-coal has been exploited, need to use coal seam (for 8 coals) plate destructing depth on both-end shutoff side leakage device in-site measurement, for exploitation lower floor's coal (for 9 layers of coal) provides Grout data, if 8 layers of coal seam floor collapse dept do not arrive grey top difficult to understand, then only need the further grouting and reinforcing floor undulation of inspection eye carrying out 8 layers of coal injected hole sum 20% at lower floor's coal, if the plate destructing depth of 8 layers of coal reaches grey top slip casting place difficult to understand, then the program of 8 layers of coal grout transformation difficult to understand is needed to carry out grout transformation floor undulation.
(4) inlet well design and construction:
A () drilling design inclination angle requires: for improving boring utilization rate, adopt the mode of " segmenting slip casting ", not only can carry out slip casting to five grey aquifers, and slip casting can also be carried out to the aquifer of ash difficult to understand, pass through aquifer in Ordovician limestone under floor undulation as much as possible, be therefore the tangent value of the angle of inlet well according to floor undulation absolute altitude to project on the stope ratio of L of the distance h in aquifer, Austria grey top and inlet well.Because the distance of floor undulation to aquifer in Ordovician limestone is fixed, the projection of inlet well on stope changes within the specific limits, requires 25 ~ 35 degree of excursions; In order to save the labour of mobile drill, carry out " repeatedly perforate " in same rig place.The design of work plane grey top difficult to understand inlet well as shown in Figure 2, from 8804 work plane haulage gates as track crossheading direction drilling, at the same rig point of 8804 rail transport crossheading, the inlet wells of the different trend of construction 8804 ash 5,6,7 three difficult to understand;
(b) inlet well sleeve pipe and construction requirement: as shown in Figure 3, opening diameter is 146mm to hole structure, sleeve pipe Ф 127mm, long 5m; Secondary structure Ф 108mm, sleeve pipe 35m, be drilled into 5m position, below 11 coal seams; Tertiary structure Ф 89mm, sleeve pipe 70m, be drilled into 1m position, grieshoch position difficult to understand; Whole pore structure Ф 73mm.Estimate the grey hydraulic pressure 3.7MPa in this place five; Ordovician karst water pressure 4.5MPa, sealing sleeve pipe needs 20m by regulation, and one, two, three casing length all meets the demands; For meeting high-pressure slip-casting needs, boring water valve is installed on final stage sleeve pipe, is connected after casing flange dish at different levels will superpose with water valve, and the maximum anti-pressure ability of water valve will match with slip casting whole hole pressure; Drilling depth 0.5m darker in expectation casing point during setting of casing, under enter sleeve pipe after to adopt fresh P.O42.5 cement to be made into water/binder ratio be that 0.8:1 ~ 1:1 (proportion is 1.4 ~ 1.6) neat slurry carries out sealing of hole, indivedual mine is for improving setting time, take to add water glass measure, after neat slurry setting time is not less than 72 hours, cleaning bottom of hole carries out withstand voltage test, the pressure of withstand voltage test is not less than maximum grouting pressure and adds 1MPa, after five grey aquifer grout transformation terminate 72 hours, five grieshoch positions can be entered by cleaning bottom of hole, as the five grey water yields are greater than 5m
3/ h, will carry out grouting and reinforcing again.
(5), grout transformation technique:
After clay cement grout is completed by slip casting station by ground, by underground transportation pipeline, clay cement grout is transported to the work plane of corresponding grout transformation, by grouting pump, the base plate work of underground grouting retrofit work face is carried out to the boring of having constructed.In slip casting process, slip casting work plane is adopted to divide order, single hole segmenting slip casting, single hop continuous grouting and the method that combines of interval slip casting: slip casting work plane adopts the method for first dredging close, middle interpolation afterwards, single inlet well first carries out grout transformation to five ashes, extend to grey top difficult to understand grout transformation again, a hole section carries out continuous grouting, find down-hole running pulp time can interval slip casting; Grouting pressure generally selects 2 ~ 5 times of slip casting aquifer hydraulic pressure; Grouting pump amount is according to the development degree determination pump amount of aquifer Karst Fissures; Grouting serous fluid density generally adopts 1.12 ~ 1.18g/cm
3.In order to increase slurries diffusion length, improve slip casting effect, the standard in the whole hole of single hole needs high pressure, little pump amount, dilute slurry.
For certain grouting retrofit work face base plate, ore deposit 8804 (Fig. 2), 31 inlet wells of constructing altogether, wherein construction drill 9 boring outside face, 22 borings of constructing in face.What 8804 grouting methods adopted is the mode that segmentation divides order, wherein the first order construction drill 9, the second order construction drill 8, inspection eye 5.Single inlet well illustrates for 8804 work planes of the first order, 22 bored grouting situations statistical form (table 2) difficult to understand.22 drilling orifice absolute altitude-362.2m, hole depth 152m difficult to understand, 26 degree, inclination angle, hydraulic pressure of wherein holing during hydraulic pressure when exposure five grey aquifer is 1.5Mpa, and water yield is 10m
3/ h, is greater than 5m
3/ h, needs to carry out slip casting, slip casting total amount 223.5m to five grey aquifers
3, serum density 1.12 ~ 1.15g/cm
3, use clay 53.6t, cement 27.7t, in slip casting process, grouting pressure is at 3 ~ 4MPa, grouting pump amount 100 ~ 120L/min, 37 hours slip casting time.After five grey slip castings complete, extend boring to aquifer in Ordovician limestone, Ordovician karst water pressure is 3.6Mpa, and the water yield is 70m
3/ h, in slip casting process, grouting pressure at 8 ~ 10MPa, slip casting total amount 247.9m
3, clay 55.9t, the close 1.14 ~ 1.17g/cm of cement 38.9t slurries
3, grouting pump amount is 110 ~ 120L/min, occurs running pulp phenomenon in slip casting process, and therefore adopt batch (-type) slip casting, the slip casting time is 53 hours, whole hole pressure 11.5MPa.
Table 2: 22 inlet well statistical forms difficult to understand
(6), detection of grouting effects and evaluation:
1. detection of grouting effects: adopt drilling test method or physical prospecting detection method to detect slip casting effect
A) drilling test method: probing inspection eye is arranged in analyzes the location that grouting quality is poor, the weak band of structure, Geophysical Anomalies band or injected hole are sparse, the quantity of inspection eye is no less than 20% of injected hole, main Contents for Monitoring is the single hole water yield and fracture filling situation, calculus, the filling situation adopting down-hole drilling endoscope to observe slurries in rock cranny with good conditionsi;
B) physical prospecting detection method: main utilization adopts the down-hole three-dimensional mine geophysical exploration such as electrical method, transient electromagnetic method to carry out meticulous detecting to before and after work plane inner bottom plating grout transformation, by the change of formation resistivity before and after contrast slip casting, analytical work face floor strata grout transformation situation.
2. evaluation method:
A) water yield comparison method before and after grout transformation: when the inspection eye water yield reaches following provisions, coal-face can be exploited :-300m is not more than 20m with the shallow inspection eye water yield
3/ h;-300m is not more than 10m with the dark inspection eye water yield
3/ h.See (table 3) (for data before slip casting before slash, being data after slip casting after slash) with 8804 grouting inspection boring statistical forms, construct altogether 5 and check boring, absolute altitude, all below-300m, is therefore greater than 10m
3/ h, needs to carry out grout transformation to aquifer in Ordovician limestone.Difficult to understand 5 and 18 place's slip casting effects difficult to understand bad, further grout transformation reinforcement face base plate need be carried out, meet the demands after grouting and reinforcing.
Table 3: inspection eye situation statistical form
B) physical prospecting method of comparison: by transforming the comparative analysis of front and back physical prospecting achievement to grouting, as shown in Figure 4,5, before and after contrast slip casting, resistivity section is known for result, and section left part low resistance region is obviously reduced, originally resistivity value becomes large, and the shape of low resistance region scope there occurs change; The high resistance region on the right there occurs change, diminishes before the relative slip casting of formation resistivity value, illustrates to change original formation resistivity values after relevant slip casting, and greatly, Local Layer resistivity value diminishes in integrally layer resistivity change; Resistivity value change reason be DC electrical method measure be apparent resistivity value, it is not the true resistance rate on stratum, apparent resistivity is the entirety reflection of stratum watery sector, therefore will carry out further slip casting for local water enrichment area, to ensure that work plane is kept the safety in production.
Claims (1)
1. a method for Austria grey top grouting and reinforcing floor undulation, is characterized in that specifically comprising the following steps:
(1), the feasibility of grey top slip casting difficult to understand is analyzed: aquifer in Ordovician limestone is the multi-section multi-layer aquifer with layer control, structure control and rhythmic nature, and each water-bearing interval has relative independentability and inter-relation; Wherein grey roofing upper section 0 ~ 20m difficult to understand is relative aquitard section, and wherein 0 ~ 10m scope is relative water resisting layer section, forms the cap rock needed for the grout transformation of grey top difficult to understand; Grey top stage casing 20 ~ 40m difficult to understand is relative strong aquifer section, is the interval of interest of Austria's grey top grout transformation; The relative aquitard section of grey top hypomere 40 ~ 150m difficult to understand to be thickness be 90m is the bottom needed for Austria's grey top grout transformation interval of interest;
(2) region of grey top difficult to understand grouting and reinforcing floor undulation, is determined: the floor undulation possessing one of following condition is transformed: (a) is according to " mine geological hazards regulation ": base plate is by structure destruction location work plane grey water bursting coefficient difficult to understand more than 0.06MPa/m, and work plane grey water bursting coefficient difficult to understand in normal location is more than 0.1MPa/m; B () work plane grey water bursting coefficient difficult to understand is no more than " mine geological hazards regulation ", but be in hydrous fluids and strong runoff band, and comprehensive analysis has grey gushing water danger difficult to understand; C () is visited by existing physical prospecting, probing, lane or is taken out/outflow test, detect that floor undulation exists the vertical passage abnormal belt of structurally fractured zone, leaking crevice belt, water barrier thinning belt, karst collapse col umn, Ordovician karst water supply thin layer limestone, water-resisting floor can not resist the actual hydraulic pressure value of thin layer limestone and aquifer in Ordovician limestone;
(3), the grey top slip casting degree of depth difficult to understand is determined:
Slip casting degree of depth formula is calculated according to work plane grey water bursting coefficient difficult to understand:
in formula, T
1for the grey water bursting coefficient difficult to understand of the work plane before reinforcing, unit is MPa/m; T
2for the grey water bursting coefficient difficult to understand of the work plane after reinforcing, unit is MPa/m; M
1for reinforcing leading face water-resisting floor thickness, unit is m; Recycling formula (1), calculates each working face of coal seam base plate grey top slip casting degree of depth difficult to understand respectively in conjunction with work plane grey water bursting coefficient difficult to understand and critical absolute altitude; From first floor coal, after first floor coal mining completes, use existing both-end shutoff side leakage device in-site measurement first floor coal seam floor collapse dept, for exploitation second layer coal provides grout transformation data, by that analogy, terminate to last one deck coal;
(4), inlet well: the inclination angle of inlet well changes between 25 ~ 35 degree, in same place, difference moves towards the principle adopting " repeatedly perforate ", it is constant that the movement reducing rig brings, use existing " three grades of sleeve pipes " structure to carry out inlet well, guarantee the validity of grey top slip casting difficult to understand; Boring disclose and through five grey aquifers time, the hydraulic pressure in five grey aquifers, the water yield slip casting is carried out to this aquifer be measured, prevent five grey aquifers from impacting Austria's grey top slip casting;
(5), slip casting: after clay cement grout is completed by slip casting station by ground, by underground transportation pipeline, clay cement grout is transported to the work plane of corresponding grouting and reinforcing, by grouting pump, the base plate work of underground grouting reinforcement face is carried out to the boring of having constructed, in slip casting process, adopt slip casting work plane to divide order, single hole segmenting slip casting, the method that single hop continuous grouting combines with interval slip casting, slip casting work plane is close after adopting and first dredging, the method of middle interpolation, single inlet well first carries out slip casting to five ashes, extend to grey top slip casting difficult to understand again, a hole section carries out continuous grouting, interval slip casting during discovery down-hole running pulp, grouting pressure is 2 ~ 5 times of slip casting aquifer hydraulic pressure, grouting pump amount is determined according to the development degree of aquifer Karst Fissures, grouting serous fluid density is 1.12 ~ 1.18g/cm
3,
(6) detection of grouting effects and evaluation: adopt existing probing or mine geophysics detection method to detection of grouting effects, makes emphasis to the region of complex structure and detects; After detection of grouting effects completes, utilize the change of existing probing method inspection eye water yield size to slip casting effect evaluation, utilize mine geophysics result map simultaneously, before and after contrast slip casting, physical property changes and makes slip casting effect evaluation.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106437790A (en) * | 2016-12-02 | 2017-02-22 | 淮北矿业股份有限公司 | High-pressure-intensity water-containing layer karst fissure grouting method of difficult mining coal seam base plate thin-layer limestone |
| CN110082252A (en) * | 2019-05-31 | 2019-08-02 | 宿州学院 | A kind of grouting serous fluid bleed experimental provision and syneresis rate changing rule test method |
| CN110145336A (en) * | 2019-05-23 | 2019-08-20 | 焦作煤业（集团）有限责任公司 | A kind of coal working face top plate rich water gravel layer bored grouting method |
| CN111042831A (en) * | 2019-08-20 | 2020-04-21 | 北京龙软科技股份有限公司 | Grouting reinforcement transformation method for coal seam floor limestone confined aquifer |
| CN112240213A (en) * | 2020-06-09 | 2021-01-19 | 冀中能源峰峰集团有限公司 | Method for grouting, reinforcing and transforming coal mine underground coal seam bottom plate |
| CN112879041A (en) * | 2021-01-23 | 2021-06-01 | 中铁二十三局集团第一工程有限公司 | Construction method for treating diseases of main structure of subway |
| CN113958285A (en) * | 2021-10-21 | 2022-01-21 | 中国水利水电第四工程局有限公司 | Coal seam treatment method for preventing coal mine from water and sand bursting and solidifying |
| CN114527253A (en) * | 2022-03-02 | 2022-05-24 | 山东省水利科学研究院 | Seawater intrusion layered monitoring device and method |
| CN114856688A (en) * | 2022-04-13 | 2022-08-05 | 华北科技学院 | Method for controlling deformation of coal seam floor rock stratum by underground grouting slurry filling casing |
| CN115306346A (en) * | 2022-08-19 | 2022-11-08 | 山西汾西矿业(集团)有限责任公司双柳煤矿 | Mine Aojiao top slip casting reinforcing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110145336A (en) * | 2019-05-23 | 2019-08-20 | 焦作煤业（集团）有限责任公司 | A kind of coal working face top plate rich water gravel layer bored grouting method |
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| CN111042831A (en) * | 2019-08-20 | 2020-04-21 | 北京龙软科技股份有限公司 | Grouting reinforcement transformation method for coal seam floor limestone confined aquifer |
| CN112240213A (en) * | 2020-06-09 | 2021-01-19 | 冀中能源峰峰集团有限公司 | Method for grouting, reinforcing and transforming coal mine underground coal seam bottom plate |
| CN112879041A (en) * | 2021-01-23 | 2021-06-01 | 中铁二十三局集团第一工程有限公司 | Construction method for treating diseases of main structure of subway |
| CN113958285A (en) * | 2021-10-21 | 2022-01-21 | 中国水利水电第四工程局有限公司 | Coal seam treatment method for preventing coal mine from water and sand bursting and solidifying |
| CN114527253A (en) * | 2022-03-02 | 2022-05-24 | 山东省水利科学研究院 | Seawater intrusion layered monitoring device and method |
| CN114856688A (en) * | 2022-04-13 | 2022-08-05 | 华北科技学院 | Method for controlling deformation of coal seam floor rock stratum by underground grouting slurry filling casing |
| CN115306346A (en) * | 2022-08-19 | 2022-11-08 | 山西汾西矿业(集团)有限责任公司双柳煤矿 | Mine Aojiao top slip casting reinforcing apparatus |
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