CN104763428B - Grading And Zoning grouting and reinforcing karst collapse col umn makes the method for the fully mechanized coal face soft karst collapse col umn of straight mistake - Google Patents
Grading And Zoning grouting and reinforcing karst collapse col umn makes the method for the fully mechanized coal face soft karst collapse col umn of straight mistake Download PDFInfo
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Abstract
Grading And Zoning grouting and reinforcing karst collapse col umn makes the method for the fully mechanized coal face soft karst collapse col umn of straight mistake, belongs to Coal Mining Technology field, and it, on the basis of exploration, draining, is first divided into karst collapse col umn: roof reinforcement district, cut district and jacking of floor district；Reinforcing thickness reasonable Arrangement further according to karst collapse col umn shape, size, position and respective regions is holed, and the serosity of respective material proportioning it is injected separately in each region, slip casting improves the cementing properties of karst collapse col umn interior rock, so that the karst collapse col umn rock of zones of different reaches required mechanical property and bearing capacity；Then reduce mining height when work surface is close to karst collapse col umn and slow down the severe degree of roof movement, reduce the lead abutment pressure to karst collapse col umn, make fully-mechanized mining working can directly pass through karst collapse col umn.The method greatly reduces workload, waste of material and expense compared with the method that existing grouting and reinforcing karst collapse col umn makes the straight passing sunk pillars on full of fully-mechanized mining working, improves production efficiency and safety.
Description
Technical field
The invention belongs to Coal Mining Technology field, the method that a kind of Grading And Zoning grouting and reinforcing karst collapse col umn makes the fully mechanized coal face soft karst collapse col umn of straight mistake.
Background technology
Coal measure strata underlies, and solubility limestone washes away for a long time through subsoil water, corrosion forms solution cavity, and under the effect of overlying rock gravity and geological structure force, stratum, solution cavity top is progressively broken to subside, and has ultimately formed karst collapse col umn, also known as non-coal pillar.
Karst collapse col umn is a kind of geological hazard body common in coal production, is widely distributed in China's Carboniferous-permian, north China coal measure strata.The existence of karst collapse col umn destroys the seriality of coal, has had a strong impact on the normal production in colliery.Therefore, find a kind of method making fully-mechanized mining working directly pass through karst collapse col umn in coal mining, become very urgent.
At present, in process of coal mining, fully-mechanized mining working is mainly had removal of home jumping to adopt by the method for karst collapse col umn, is dug around lane with directly as hard as three kinds.For the karst collapse col umn that the property of water-bearing is stronger; protection coal pillar is set in order to ensure that safety need are stayed; general employing removal of home jumping is adopted, the mode around lane of digging is passed through; but for the karst collapse col umn that some properties of water-bearing are weak; the fewest as hard as having Coal Loss; the advantages such as little impact on production, coal resources utilization rate and economic benefit are high.According to the intensity of karst collapse col umn rock, directly as hard as method can be roughly divided into by hard karst collapse col umn and soft karst collapse col umn two kinds.
Technique study currently for direct karst collapse col umn really up to the mark is more, and disclosed method is broadly divided into physical method and chemical method.Main physical method has 1. presplitting Mobilization；2. boring reduction method.Presplitting Mobilization is to use the means such as explosion, high electric field pulse crush that karst collapse col umn is implemented work surface after presplitting loosens or is broken directly to pass through.For in-place blasting out, explosion not only complex process affects the problems such as construction speed, and slungshot infringement support.For high electric field pulse fragmented rock body, main application Oil/gas Well deep rock mass broken, for exist the explosion hazard gases such as gas, coal dust and have people to work coal-face for, the safety of application is the most unknowable.Boring reduction method is directly passed through by work surface after making it weaken karst collapse col umn boring, but it is many to there is drilling construction quantity, and quantities is big, the problem that project progress is slow.Common chemical method is that karst collapse col umn is injected chemical solution, chemical solution is utilized to dissolve karst collapse col umn rock mineral composition, its intensity is made to cut through after reducing, but it is big that the infiltration of the injection rate of chemical solution, chemical solution and dissolving control difficulty, chemical solution may corrode or affect coal-cutting machinery simultaneously, reduces the life-span.
At present, pass through again after directly only having grouting and reinforcing by the method for soft karst collapse col umn, due in soft karst collapse col umn often by some shale thing Filling Cementations, but cementing properties is poor, overall mechanical property is excessively poor, and self does not have bearing capacity, so directly letting out phenomenon by there will be to burst, cause the generation of work surface roof fall accident, simultaneously support by time be difficult to pass through owing to karst collapse col umn base plate soft bearing capacity difference causes bracket base to sink, have a strong impact on safety and manufacturing schedule.Karst collapse col umn grouting method the most used is typically the slip casting that karst collapse col umn is not added with distinguish, i.e. slip casting time, serosity kind and reinforcing area all do not differentiate between, and which results in problems.For the slip casting time, owing to karst collapse col umn cylinder and surrounding rock stratum integrity and stress state are different from common rock stratum, STRESS VARIATION in karst collapse col umn body can be caused when work surface is close to karst collapse col umn, cause cylinder disturbance to destroy, if the slip casting time is improper, then do not have the effect of reinforcing.For the serosity injected and reinforcing area, if the region reinforced implements to inject same serosity, although karst collapse col umn intensity is improved, but the intensity of karst collapse col umn cut district and corresponding roof and floor is equal, improve the difficulty in cut district, even define artificial " hard karst collapse col umn ", also need to utilize hard karst collapse col umn directly to carry out after-treatment as hard as method.If overall excessive being difficult to of slip casting intensity is cut, intensity is too small is not sufficient to ensure that safety this considerably increases workload and expense, wastes material, reduces efficiency and safety.Therefore, finding a kind of economical and practical, simple and efficient, safe and reliable method makes fully-mechanized mining working be directly the most necessary by soft karst collapse col umn.
In sum, under prior art conditions, grouting and reinforcing karst collapse col umn makes fully-mechanized mining working be directly consolidation time and fastening strength and the increase not differentiating between brought workload, waste of material and expense in region by the subject matter of soft karst collapse col umn, and reduction and the safety of production efficiency are poor.Therefore, searching is needed a kind of economical and practical, simple and efficient, safe and reliable method badly and karst collapse col umn is carried out Grading And Zoning reinforcing, improves its corresponding mechanical property and bearing capacity, it is ensured that fully-mechanized mining working is directly by soft karst collapse col umn.
Summary of the invention
The present invention provides a kind of Grading And Zoning method that grouting and reinforcing karst collapse col umn makes the fully mechanized coal face soft karst collapse col umn of straight mistake, make fully-mechanized mining working directly poor etc. by the subject matter i.e. consolidation time of soft karst collapse col umn and fastening strength and the increase not differentiating between brought workload, waste of material and expense in region, the reduction of production efficiency and safety solving grouting and reinforcing karst collapse col umn.
The method that a kind of Grading And Zoning grouting and reinforcing karst collapse col umn makes the fully mechanized coal face soft karst collapse col umn of straight mistake, comprises the steps:
Step one, the border being determined karst collapse col umn by physical prospecting or probing and karst collapse col umn include regimen condition, and draining；
Step 2, sample analysis: karst collapse col umn rock i.e. carries out drill hole sampling, measure natural uniaxial compressive strength, porosity, moisture content and the infiltration coefficient of sample；
Step 3, subregion and predict each district reinforce after physical and mechanical parameter: i.e. according to roof reinforcement thickness, karst collapse col umn is divided into jacking of floor district, cut district and roof reinforcement district in vertical direction by jacking of floor thickness and coal-winning machine cutting depth；
The result of calculation using elastic theory show that the reinforcing thickness in each district of karst collapse col umn is: in the range of roof reinforcement district thickness is coal seam thickness, when calculating the mechanics parameter after roof reinforcement, resistance needed for roof reinforcement district homeostasis and hydraulic support working resistance is equal pushes away after karst collapse col umn is reinforced the physical and mechanical parameters such as the critical unit weight of induration, internal friction angle, comprcssive strength as critical condition is counter；Jacking of floor thickness: jacking of floor thickness is the 1/3～2/3 of coal seam thickness, and jacking of floor thickness wants the pressure that weight tray is born, the pressure that base plate is born is hydraulic support weight and the roof pressure sum of top board transmission, and not sinking with hydraulic support is as the criterion counter pushes away the physical and mechanical parameter such as comprcssive strength of induration after karst collapse col umn is reinforced；Cut district integral reinforcing, and need to ensure after slip casting that the hardness of induration is less than the highest hardness of coal-winning machine cut, and counter push away after karst collapse col umn is reinforced the physical and mechanical parameters such as the shearing strength of induration；
Step 4, simulation grouting test: the physical and mechanical parameter of the induration in 3 regions drawn according to step 3, then pass through taken karst collapse col umn sample and dissimilar and proportioning serosity simulation grouting test, determine type and the proportioning of serosity.
Step 5, determine array pitch between roof reinforcement district inlet well according to the porosity of karst collapse col umn and the infiltration coefficient measured in step 2, and then determine setting time and grouting pressure, select slip casting facility.
Step 6, Grading And Zoning carry out slip casting: i.e. first inject rapidly solidified chemical grout in karst collapse col umn corresponding cut district, then at serosity corresponding determined by other twoth districts implantation steps four；
Cut district slip casting needs first to use intensive boring at up-and-down boundary, injects the chemical grout of rapid condensation, the porous dehiscence slot sytem of closure cut district karst collapse col umn rock mass, forms sealing coat, after carry out slip casting at middle part；The slip casting of cut district carries out floor grouting after terminating；Finally carry out the slip casting of roof reinforcement district；
Step 7, utilize observation ore deposit pressure measured data and combine the method for numerical simulation and judge that working face in the face of the influence degree of the stress of karst collapse col umn and affects distance, judging the opportunity to karst collapse col umn reinforcing with this；
Step 8, formulate in the condition according to fully-mechanized mining working and weaken the ore deposit measure that manifests of pressure accordingly and make fully-mechanized mining working pass through karst collapse col umn.
The present invention, according to the shape of karst collapse col umn, size, position, arranges boring, Grading And Zoning grouting and reinforcing, improves its corresponding mechanical property and bearing capacity.When work surface is by karst collapse col umn, work surface roof and floor is stable, so that work surface directly can let out type karst collapse col umn by bursting.
Compared with prior art, The present invention reduces workload, waste of material and expense, improve production efficiency and safety, be a kind of economical and practical, simple and efficient, safe and reliable to make fully-mechanized mining working directly by the method for soft karst collapse col umn.
Accompanying drawing explanation
Fig. 1 is the position plane schematic diagram of present invention ore deposit fully-mechanized mining working and karst collapse col umn；
Fig. 2 is that present invention ore deposit working face is in the face of karst collapse col umn injected hole plane of arrangement schematic diagram；
Fig. 3 is that present invention ore deposit working face is in the face of karst collapse col umn injected hole layout generalized section；
In figure: 1, open-off cut；2, haulage way；3, tailgate；4, karst collapse col umn；5, inlet well；6, roof reinforcement district；7, cut district；8, jacking of floor district.
Detailed description of the invention
Combine accompanying drawing below for certain ore deposit geological condition by embodiment, the detailed description of the invention of the present invention to be further illustrated.
Step one, as described in Figure 2, determines the shape of certain ore deposit karst collapse col umn, size, position and the geological condition in fully-mechanized mining working front by physical prospecting and drilling method.
Karst collapse col umn 4 shape approximate ellipsoidal after measured, major axis is 26.0m, and short axle is 23.0m, and the area of plane is 441m2, and karst collapse col umn distance tailgate 3 is nearer than distance haulage way 2；
There is retention of excessive fluid phenomenon in karst collapse col umn further, carry out draining；First two leting speeper boring (borehole bottom location be positioned at above tunnel at 50 meters) has been constructed inside work surface and above karst collapse col umn by water yield drainage at tailgate 3, till making the loose media in cylinder can not form mud-rock flow, simultaneously construction monitoring hole at vertical depth 50 meters above karst collapse col umn, water guide situation above monitoring karst collapse col umn, and improve the drainage system of tailgate on request and be equipped with slush pump；
Step 2, karst collapse col umn rock is carried out drill sampling, rock sample is made standard specimen.Record natural uniaxial compressive strength, porosity, moisture content and the infiltration coefficient of its rock.
Step 3, karst collapse col umn is divided into jacking of floor district, cut district and roof reinforcement district in vertical direction according to roof reinforcement thickness, jacking of floor thickness and coal-winning machine cutting depth；
The result of calculation using elastic theory show that the reinforcing thickness in each district of karst collapse col umn is: in the range of roof reinforcement district thickness is coal seam thickness, when calculating the mechanics parameter after roof reinforcement, resistance needed for roof reinforcement district homeostasis and hydraulic support working resistance is equal pushes away after karst collapse col umn is reinforced the physical and mechanical parameters such as the critical unit weight of induration, internal friction angle, comprcssive strength as critical condition is counter；Jacking of floor thickness: jacking of floor thickness is the 1/3～2/3 of coal seam thickness, and jacking of floor thickness wants the pressure that weight tray is born, the pressure that base plate is born is hydraulic support weight and the roof pressure sum of top board transmission, and not sinking with hydraulic support is as the criterion counter pushes away the physical and mechanical parameter such as comprcssive strength of induration after karst collapse col umn is reinforced；Cut district integral reinforcing, and need to ensure after slip casting that the hardness of induration is less than the highest hardness of coal-winning machine cut, and counter push away after karst collapse col umn is reinforced the physical and mechanical parameters such as the shearing strength of induration；Because this pit coal layer thickness is 6.4m, mining height is 2.8m, so and the borehole bottom location holed hangs down at high 10m more than force piece and base plate with sagging high 1～2m at；
Step 4, the induration physical and mechanical parameter in 3 regions drawn according to step 3, then pass through taken karst collapse col umn sample and dissimilar and proportioning serosity simulation grouting test, determine type and the proportioning of serosity.
During passing sunk pillars on full-mechanized mining working face, the selection principle of slip casting strengthening material is further: the cut district of karst collapse col umn is coal-winning machine cut to be facilitated after grouting and reinforcing, so the intensity that karst collapse col umn is after grouting and reinforcing can not be the highest, with the strength similarity in coal seam；When the adjoining rock of karst collapse col umn intensity after grouting and reinforcing work surface to be met passes through, roof and floor is stable, i.e. by the regulation ratio of mud and coefficient of foaming, meets its varying strength requirement.Additionally, casting resin must have preferable mobility, permeability, setting time is short, nontoxic, with low cost and is prone to buy.
Compared by laboratory test further, a kind of novel silica-based inorganic airtight No. I setting time 5～10min of the urea acid auspicious rice of fat material, there is preferable mobility and permeability, and intensity reaches to design requirement, so cut district injecting paste material selects airtight No. I of auspicious rice during passing sunk pillars on full-mechanized mining working face；The intensity of adjoining rock when No. 525 strength of cement meet passing sunk pillars on full, therefore during passing sunk pillars on full, adjoining rock slip casting strengthening material selects No. 525 cement.
Further according to the grouting amount of the below equation each injected hole of estimation:
In formula, Q is grouting amount, m3；V is the volume needing filling, m3；N is obturator porosity, layer of sand n=25% ~ 40%, cavity n=1；A is serosity loss coefficient, takes a=1.1 ~ 1.3.
Total grouting amount is that single hole grouting amount is multiplied by brill slurry number, is 1784.5m by calculating the total grouting amount in this ore deposit3, a diameter of 75mm of injected hole 5；Grouting tube uses the seamless steel pipe of φ 25mm, and top is cone, and periphery is quincuncial arrangement, the colored hole of spacing 15cm length, aperture φ 10mm.
Determine trestle column and the bore arrangement mode of injected hole further according to the dilation angle of serosity, the pitch-row of holes should ensure that slip casting rear slurry penetration range has certain intersection, and trestle column, so should be less than the dilation angle of 2 times, most preferably takes 0.8 times of 2 times of dilation angle；
Step 5, calculate the dilation angle of serosity according to parameters such as the porosity of karst collapse col umn measured in step 2 and infiltration coefficients, the dilation angle utilizing serosity determines array pitch between roof reinforcement district inlet well, and then determine setting time and grouting pressure, select slip casting facility；
The dilation angle of serosity determines according to situations such as the on-the-spot mechanical property of country rock, crack situation, serosity character and grouting pressures further.Degree of crushing according to country rock determines grouting pressure: can be selected for the grouting pressure of 0.5MPa when country rock seriously crushes, and takes about 1.0MPa when relatively crushing, and takes 1.0～2.0MPa when crack is less, the highest less than 3MPa.If Surrounding Rock Strength is relatively low, grouting pressure is less than the 1/3 of its comprcssive strength.
Step 6, grouting sequence Grading And Zoning are carried out, first at the chemical pulp that cut district note is rapidly solidified, then at serosity determined by other twoth districts note；The slip casting of cut district needs first to use intensive boring at up-and-down boundary, injects the chemical pulp of rapid condensation, closure cut district porous dehiscence slot sytem, forms sealing coat, then in middle part normal process slip casting；Floor grouting is carried out after the slip casting of cut district terminates, and roof reinforcement district is finally carried out；Being moved towards direction trestle column by the injected hole 5 in this ore deposit of above method along tunnel is that 2m arranges (see figure 3), on the section being perpendicular to tunnel, boring on top, Xiang Banghe lane is arranged as shown in Figure 3, can suitably encrypt in case of exceptional circumstances, grouting mode to put in order the 3rd boring in first cut district, the 7th boring, the 4th boring, the 6th boring, the 5th boring by boring, 1st boring in jacking of floor district, the 2nd boring again, the 8th boring in last roof reinforcement district, the 10th boring, the 9th boring, the 11st boring by stages are every carrying out.
Step 7, utilize observation actual measurement ore deposit pressure data and combine the method for numerical simulation and judge that work surface on the influence degree of the stress of karst collapse col umn and affects distance, judging the opportunity to karst collapse col umn reinforcing with this；
According to ore deposit pressure measured data and numerical simulation study, to work surface front and the numerical simulation study of karst collapse col umn stress during Coal Face Passing Through karst collapse col umn, find according to affecting distance and mining induced stress and influencing each other of karst collapse col umn body stress can be divided into 3 Main Stage by degree: weak affect the stage, middle affect the stage, affect the stage by force.Should weak affect the stage arrive before strengthen and subside cylinder, affect the stage strengthen the roof control of work surface strong.During work surface distance karst collapse col umn 150m, start karst collapse col umn body stress is produced impact, start to carry out pre-grouting reinforcing by inlet well 5 to karst collapse col umn in tailgate 3.
Step 8, fully-mechanized mining working is made to pass through karst collapse col umn under conditions of the condition according to work surface is formulated and weakened the ore deposit technical measures that manifest of pressure accordingly.
Work surface away from karst collapse col umn 50m time, karst collapse col umn start to work surface mining induced stress produce considerable influence.Therefore, start to strengthen the management of hydraulic support from work surface close to karst collapse col umn 50m, it is ensured that setting load and yield load.Start neighbouring frame hydraulic support from work surface close to karst collapse col umn 20m and gradually decrease mining height to slow down the severe degree of roof movement, reduce the impact on karst collapse col umn.Determine that by the work surface mining height of karst collapse col umn be 2.8m according to the situation that karst collapse col umn is reinforced, thus reach that fully-mechanized mining working is safe efficient, effect quickly through karst collapse col umn.
The method that the Grading And Zoning grouting and reinforcing karst collapse col umn that the embodiment of the present invention provides makes the fully mechanized coal face soft karst collapse col umn of straight mistake, on the basis of exploration, draining, is first divided into karst collapse col umn: roof reinforcement district, cut district and jacking of floor district；Reinforcing thickness reasonable Arrangement further according to karst collapse col umn shape, size, position and respective regions is holed, and the serosity of respective material proportioning it is injected separately in each region, slip casting improves the cementing properties of karst collapse col umn interior rock, so that the karst collapse col umn rock of zones of different reaches required mechanical property and bearing capacity；Then reduce mining height when work surface is close to karst collapse col umn and slow down the severe degree of roof movement, reduce the lead abutment pressure to karst collapse col umn, make fully-mechanized mining working can directly pass through karst collapse col umn.The method greatly reduces workload, waste of material and expense compared with the method that existing grouting and reinforcing karst collapse col umn makes the straight passing sunk pillars on full of fully-mechanized mining working, improve production efficiency and safety, it is a kind of economical and practical, simple and efficient, safe and reliable to make fully-mechanized mining working directly by the method for soft karst collapse col umn, there are stronger promotion and application and be worth.
Claims (4)
1. the method that grouting and reinforcing karst collapse col umn in Grading And Zoning makes the fully mechanized coal face soft karst collapse col umn of straight mistake, its feature comprises the steps:
(1), determine that border and the karst collapse col umn of karst collapse col umn include regimen condition draining；
(2), karst collapse col umn rock is holed materials and measure natural uniaxial compressive strength, porosity, moisture content and the infiltration coefficient of sample；
(3), subregion and predict each district reinforce after physical and mechanical parameter: karst collapse col umn is in axial direction divided into jacking of floor district, cut district and roof reinforcement district；Calculate jacking of floor district, cut district and the thickness in roof reinforcement district simultaneously；
(4), use several serosity to be simulated grouting test, determine the proportioning serosity that jacking of floor district and roof reinforcement district use；
(5), determine array pitch, setting time and grouting pressure between roof reinforcement district inlet well, select slip casting facility；Wherein, the array pitch dilation angle less than 2 times；
(6), Grading And Zoning carries out slip casting: first injects chemical grout in cut district, injects proportioning serosity in jacking of floor district and roof reinforcement district the most successively；
Wherein, first to injecting chemical grout in cut district up-and-down boundary intensive brill injected hole, injected hole during the slip casting of cut district, the porous dehiscence slot sytem of closure cut district karst collapse col umn rock mass, form sealing coat；Afterwards to carrying out slip casting in the middle part of cut district；
(7), utilize observation ore deposit pressure measured data and combine the method for numerical simulation and judge the influence degree of the stress of karst collapse col umn faced by working face and affect distance；Described observation ore deposit pressure measured data and the method that combines numerical simulation, mining induced stress and influencing each other of karst collapse col umn body stress will be divided into 3 Main Stage: weak affects the stage, middle affects the stage, affects the stage by force；Weak affect the stage arrive before reinforce and subside cylinder, in the roof control affecting by force stage reinforcement work surface；During work surface distance karst collapse col umn 150m, start karst collapse col umn body stress is produced impact, start to carry out grouting and reinforcing by injected hole to karst collapse col umn in tailgate；
(8), weakening ore deposit accordingly according to the condition formulation of fully-mechanized mining working presses the measure manifested to make fully-mechanized mining working pass through karst collapse col umn.
The method that Grading And Zoning the most according to claim 1 grouting and reinforcing karst collapse col umn makes the fully mechanized coal face soft karst collapse col umn of straight mistake, is characterized in that described roof reinforcement district thickness is for no more than coal seam thickness；Jacking of floor thickness is the 1/3～2/3 of coal seam thickness, and jacking of floor thickness wants the pressure that energy weight tray is born, and the pressure that base plate is born is hydraulic support weight and the roof pressure sum of top board transmission.
The method that Grading And Zoning the most according to claim 1 grouting and reinforcing karst collapse col umn makes the fully mechanized coal face soft karst collapse col umn of straight mistake, is characterized in that described chemical grout is inorganic airtight No. I of the silica-based urea acid auspicious rice of fat material；Proportioning serosity is No. 525 cement of cement.
The method that Grading And Zoning the most according to claim 1 grouting and reinforcing karst collapse col umn makes the fully mechanized coal face soft karst collapse col umn of straight mistake, is characterized in that the grouting amount of described injected hole:
In formula, Q is grouting amount, m3；V is the volume needing filling, m3；N is obturator porosity, layer of sand n=25% ~ 40%, cavity n=1；A is serosity loss coefficient, takes a=1.1 ~ 1.3.
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| CN105401971B (en) * | 2015-09-02 | 2017-10-27 | 煤科集团沈阳研究院有限公司 | Combine regional grouting method above and below a kind of well |
| CN105160188B (en) * | 2015-09-16 | 2018-11-16 | 中国矿业大学(北京) | A kind of method that determination closes on karst collapse col umn crush roadway supporting length |
| CN106761748A (en) * | 2016-12-02 | 2017-05-31 | 淮北矿业股份有限公司 | A kind of deep mining coal seam Hidden Karst Under karst collapse col umn method for blocking |
| CN109447366A (en) * | 2018-11-09 | 2019-03-08 | 昆明理工大学 | A kind of prediction technique for the Seed harvest compression strength that the loose crushed stone soil layer of floral tube grouting and reinforcing is formed |
| CN109779663B (en) * | 2019-02-01 | 2021-02-12 | 王�琦 | Gob-side entry retaining partition cooperative control method |
| CN110017152B (en) * | 2019-03-23 | 2021-08-31 | 新汶矿业集团有限责任公司孙村煤矿 | Underground engineering extremely-broken surrounding rock stepped grouting reinforcement method |
| CN111335900B (en) * | 2020-03-25 | 2021-04-27 | 王�琦 | High-strength anchoring and grouting self-tunneling method and system |
| CN112112559A (en) * | 2020-08-26 | 2020-12-22 | 山西晋城无烟煤矿业集团有限责任公司 | Method for segmented grouting of same grouting hole of underground mining face collapse column roadway |
| CN112814737B (en) * | 2021-03-10 | 2023-03-14 | 淮南矿业(集团)有限责任公司 | Collapse column advanced treatment method and system based on laminated multi-branch horizontal well |
| CN113431578A (en) * | 2021-06-11 | 2021-09-24 | 中国煤炭地质总局水文地质局 | Coal mine collapse column reinforcing construction process |
| CN114087015A (en) * | 2021-11-12 | 2022-02-25 | 中国矿业大学 | Mine solid waste disposal and working face collapse column crossing cooperation method |
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