CN114233380A - Method for conducting overburden rock isolation grouting filling on coal-based solid waste - Google Patents
Method for conducting overburden rock isolation grouting filling on coal-based solid waste Download PDFInfo
- Publication number
- CN114233380A CN114233380A CN202111611132.4A CN202111611132A CN114233380A CN 114233380 A CN114233380 A CN 114233380A CN 202111611132 A CN202111611132 A CN 202111611132A CN 114233380 A CN114233380 A CN 114233380A
- Authority
- CN
- China
- Prior art keywords
- coal
- overburden
- slurry
- space
- grouting filling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003245 coal Substances 0.000 title claims abstract description 95
- 239000011435 rock Substances 0.000 title claims abstract description 57
- 238000002955 isolation Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000002910 solid waste Substances 0.000 title claims abstract description 11
- 239000002002 slurry Substances 0.000 claims abstract description 51
- 239000000843 powder Substances 0.000 claims abstract description 36
- 239000010881 fly ash Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000010883 coal ash Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003250 coal slurry Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 208000010392 Bone Fractures Diseases 0.000 abstract 1
- 206010017076 Fracture Diseases 0.000 abstract 1
- 238000005065 mining Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention relates to a method for carrying out overburden rock isolation grouting filling on coal-based solid waste, which can improve the overburden rock isolation grouting filling performance of coal gangue powder by adding fly ash and coal slime according to different properties of the coal gangue, the fly ash and the coal slime in the coal-based solid waste during the overburden rock isolation grouting filling, and can improve the fluidity of the coal gangue powder and reduce the settling rate of the coal gangue powder when the fly ash and the coal slime reach a certain ratio. Further, according to the state of the overlying strata space, the overlying strata isolation grouting filling is divided into four stages of initial stage, development stage, stability stage and final stage, and according to the fracture development characteristic and slurry flow characteristic under the overlying strata during the grouting of the four stages, different stages of the overlying strata isolation grouting filling are provided, and the overlying strata isolation grouting filling is carried out by adopting different mixing ratios; the application problem of the coal gangue in grouting filling is solved, and the dilemma of insufficient materials in the overlying strata isolation grouting filling technology and the dilemma of land occupation and environmental pollution of the coal gangue can be effectively improved.
Description
Technical Field
The invention belongs to the field of green mining of mining engineering, and particularly relates to a method for overburden rock isolation grouting filling by using coal-based solid wastes.
Background
The building coal pressing of (structure) always hinders the development of the coal mining industry in China, especially in the middle east area of China, and the coal pressing of mining buildings has great significance for liberating coal resources, relieving the contradiction between resource development and human residence and protecting the environment. The overburden rock isolation grouting filling green mining technology is applied in a large amount due to obvious settlement reducing effect, economy and reasonability, but also causes the shortage of supply and demand of the original grouting filling material and the rising of the price. The coal gangue is waste generated in coal mining, has low carbon content and poor combustion performance, is mostly taken as waste to be stacked and treated, occupies a large amount of land, and has the risks of spontaneous combustion and the like. The coal gangue is used as a substitute material for the green mining technology of overburden rock isolation grouting filling, so that the problem of insufficient supply of filling materials in the technology can be solved, and the problems of coal gangue stacking and pollution can be solved. Therefore, a method for using coal-based solid wastes for overburden rock isolation grouting filling is needed to be formed, and the problems of coal gangue stacking and pollution and grouting filling material shortage are solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for using coal-based solid waste for overlying strata isolation grouting filling, which comprises the steps of crushing coal gangue into coal gangue powder, mixing the coal gangue powder with fly ash and coal slime, adding the mixture into water to prepare slurry for grouting, and performing grouting filling by adopting different mixing ratios at different stages of the overlying strata isolation grouting filling;
in the initial stage of overburden isolation grouting filling, unfilled or unfilled overburden space exists in the overburden, a large amount of slurry needs to be quickly injected, the subsidence of an overburden stratum on the overburden space is restrained, and the mass ratio of the coal gangue powder, the coal ash and the coal slime in the injected slurry is (6-8): (2-4): 0;
in the overburden rock isolation grouting filling development stage, namely at the initial stage of filling the overburden rock space with the slurry, the grouting pressure in the overburden rock space is smaller than the gravity of the overburden rock, the collapsed rock starts to be compressed, the fluidity of the slurry injected into the overburden rock space is reduced, the coal slurry needs to be added into the coal gangue powder and coal powder mortar for increasing the fluidity, and the mass ratio of the coal gangue powder, the coal ash and the coal slurry in the injected slurry is (4-5): (2-4): (2-4);
in the overburden space isolation grouting filling stable stage, namely after the overburden space is filled with slurry for a period of time, the overburden space is gradually expanded under the driving of high-pressure slurry, the grouting pressure at the overburden space and the overburden stratum generate stress balance, the caving rock in the middle of a goaf is gradually compacted to a certain degree, the fluidity of the slurry injected into the overburden space is continuously reduced, the quantity of coal gangue powder and the quantity of coal ash in the slurry need to be reduced again, the quantity of coal slime is increased, and the mass ratio of the coal gangue powder, the coal ash and the coal slime in the injected slurry is (3-5): (1-3): (3-5);
at the final stage of overburden rock isolation grouting filling, further expanding a overburden space, further compacting collapsed rocks in the middle of a goaf, enabling the pressure of injected slurry in the overburden space to be larger than that of an overlying strata to generate stress, the overlying strata starts to be arched, the fluidity of the slurry injected into the overburden space is further reduced, the proportion of coal slime in the slurry needs to be further improved, and the mass ratio of coal gangue powder, coal ash and coal slime in the injected slurry needs to be kept at (1-2): (2-4): (5-7).
Preferably, the particle size of the coal gangue powder is 0.5-1.5mm, the fly ash and the coal slime need to pass through a square hole sieve with the particle size less than or equal to 2mm, and the mass proportion of water in the injected slurry is less than 40%.
Has the advantages that: according to the invention, different properties of the coal gangue, the coal ash and the coal slime in the coal-based solid waste during the overburden rock isolation grouting filling are discovered through research, the coal gangue powder has the characteristics of high settling rate and poor fluidity and is not good when being used as the overburden rock isolation grouting filling material alone, the coal ash has the characteristics of moderate fluidity and settling rate, and the coal slime has the characteristics of excellent fluidity and settling rate; according to the method, the overlying strata isolation grouting filling performance of the coal gangue powder is improved by adding the coal ash and the coal slime, and when the coal ash and the coal slime reach a certain proportion, the fluidity of the coal gangue powder can be improved, and the settling rate of the coal gangue powder is reduced. Further, according to the invention, the overburden rock isolation grouting filling is creatively divided into four stages of initial stage, development stage, stability stage and final stage according to the state of the overburden rock space, and different stages of the overburden rock isolation grouting filling are provided according to the space development characteristics and slurry flow characteristics under the overburden rock during grouting in the four stages, and different mixing ratios are adopted for the overburden rock isolation grouting filling; the application problem of the coal gangue in grouting filling is solved, and the dilemma of insufficient materials in the overlying strata isolation grouting filling technology and the dilemma of land occupation and environmental pollution of the coal gangue can be effectively improved.
Drawings
FIG. 1 is a schematic diagram of a method for overburden rock isolation grouting filling by using coal-based solid waste according to the invention;
in the figure: 1-overburden space; 2-rock caving; 3-lower rock stratum; 4-an overburden; 5-slurry.
Detailed Description
The technical solution of the present invention is described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in figure 1, a method for using coal-based solid waste for overburden rock isolation grouting filling comprises the steps of crushing coal gangue into coal gangue powder with the particle size of 0.5-1.5mm, mixing the coal gangue powder with fly ash and coal slime, adding the mixture into water to prepare slurry for grouting, and performing grouting filling by adopting different mixing ratios at different stages of overburden rock isolation grouting filling; wherein the fly ash and the coal slime need to pass through a square hole sieve with the diameter less than or equal to 2mm, and the mass proportion of water in the injected slurry is less than 40 percent;
in the initial stage of overburden isolation grouting filling, unfilled or unfilled overburden space 1 exists in the overburden, a large amount of slurry needs to be quickly injected, the subsidence of an overburden stratum 4 on the overburden space is restrained, and the mass ratio of the coal gangue powder, the coal ash and the coal slime in the injected slurry is (6-8): (2-4): 0;
in the overburden rock isolation grouting filling development stage, namely at the initial stage of filling the overburden rock space 1 with the slurry 5, grouting pressure in the overburden rock space 1 is smaller than the gravity of the overburden rock 4, the caving rock 2 starts to be compressed, the fluidity of the slurry injected into the overburden rock space 1 is reduced, coal slime needs to be added into the coal gangue powder and coal powder mortar to increase the fluidity, and the mass ratio of the coal gangue powder, the coal ash and the coal slime in the injected slurry is (4-5): (2-4): (2-4);
in the overburden rock isolation grouting filling stable stage, namely after the overburden rock space 1 is filled with slurry for a period of time, the overburden rock space 1 is gradually expanded under the driving of high-pressure slurry, the grouting pressure at the overburden rock space 1 and an overburden rock layer 4 generate stress balance, the middle caving rock 2 in a goaf is gradually compacted to a certain degree, the fluidity of the slurry injected into the overburden rock space 1 is continuously reduced, the quantity of coal gangue powder and the quantity of coal ash in the slurry need to be reduced again, the quantity of coal slime is increased, and the mass ratio of the coal gangue powder, the coal ash and the coal slime in the injected slurry is (3-5): (1-3): (3-5);
at the final stage of overburden rock isolation grouting filling, the overburden space is further expanded, the caving rock 2 in the middle of the goaf is further compacted, the pressure of slurry 5 injected into the overburden space 1 is greater than that of an overburden rock layer 4 to generate stress, the overburden rock layer 4 starts to be arched, the fluidity of the slurry injected into the overburden space 1 is further reduced, the occupation ratio of coal slime in the slurry needs to be further improved, and the mass ratio of coal gangue powder, coal ash and coal slime in the injected slurry needs to be kept at (1-2): (2-4): (5-7).
Claims (2)
1. A method for using coal-based solid waste for overlying strata isolation grouting filling is characterized in that coal gangue is crushed into coal gangue powder, the coal gangue powder is mixed with fly ash and coal slime and then added into water to prepare slurry for grouting, and grouting filling is carried out at different stages of overlying strata isolation grouting filling by adopting different mixing ratios;
in the initial stage of overburden isolation grouting filling, unfilled or unfilled overburden space exists in the overburden, a large amount of slurry needs to be quickly injected, the subsidence of an overburden stratum on the overburden space is restrained, and the mass ratio of the coal gangue powder, the coal ash and the coal slime in the injected slurry is (6-8): (2-4): 0;
in the overburden rock isolation grouting filling development stage, namely at the initial stage of filling the overburden rock space with the slurry, the grouting pressure in the overburden rock space is smaller than the gravity of the overburden rock, the collapsed rock starts to be compressed, the fluidity of the slurry injected into the overburden rock space is reduced, the coal slurry needs to be added into the coal gangue powder and coal powder mortar for increasing the fluidity, and the mass ratio of the coal gangue powder, the coal ash and the coal slurry in the injected slurry is (4-5): (2-4): (2-4);
in the overburden space isolation grouting filling stable stage, namely after the overburden space is filled with slurry for a period of time, the overburden space is gradually expanded under the driving of high-pressure slurry, the grouting pressure at the overburden space and the overburden stratum generate stress balance, the caving rock in the middle of a goaf is gradually compacted to a certain degree, the fluidity of the slurry injected into the overburden space is continuously reduced, the quantity of coal gangue powder and the quantity of coal ash in the slurry need to be reduced again, the quantity of coal slime is increased, and the mass ratio of the coal gangue powder, the coal ash and the coal slime in the injected slurry is (3-5): (1-3): (3-5);
at the final stage of overburden rock isolation grouting filling, further expanding a overburden space, further compacting collapsed rocks in the middle of a goaf, enabling the pressure of injected slurry in the overburden space to be larger than that of an overlying strata to generate stress, the overlying strata starts to be arched, the fluidity of the slurry injected into the overburden space is further reduced, the proportion of coal slime in the slurry needs to be further improved, and the mass ratio of coal gangue powder, coal ash and coal slime in the injected slurry needs to be kept at (1-2): (2-4): (5-7).
2. The method for overburden rock isolation grouting filling according to claim 1, wherein the particle size of the coal gangue powder is 0.5-1.5mm, the coal ash and the coal slime need to pass through a square hole sieve with the size less than or equal to 2mm, and the mass proportion of water in injected slurry is less than 40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111611132.4A CN114233380B (en) | 2021-12-27 | 2021-12-27 | Method for isolating, grouting and filling overlying strata by using coal-based solid wastes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111611132.4A CN114233380B (en) | 2021-12-27 | 2021-12-27 | Method for isolating, grouting and filling overlying strata by using coal-based solid wastes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114233380A true CN114233380A (en) | 2022-03-25 |
| CN114233380B CN114233380B (en) | 2023-12-05 |
Family
ID=80763307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111611132.4A Active CN114233380B (en) | 2021-12-27 | 2021-12-27 | Method for isolating, grouting and filling overlying strata by using coal-based solid wastes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114233380B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562330A (en) * | 2022-04-02 | 2022-05-31 | 中国矿业大学 | Method for controlling diffusion range of filling slurry for overburden rock isolation grouting |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704933A (en) * | 2012-05-25 | 2012-10-03 | 中国矿业大学 | Isolated-section grouting filling coal-mining method for mining overburden rock |
| CN103364534A (en) * | 2013-07-03 | 2013-10-23 | 中国矿业大学 | Mining overburden rock isolation grouting filling simulation experiment device and method |
| CN206174997U (en) * | 2016-10-25 | 2017-05-17 | 淮北工业建筑设计院有限责任公司 | It moves towards subregion and keeps apart slip casting and fill structure to adopt overlying strata |
| CN107989613A (en) * | 2017-11-14 | 2018-05-04 | 太原理工大学 | A kind of overlying strata separation layer subregion isolates grouting filling working seam complete extraction method |
| CN110470522A (en) * | 2019-09-19 | 2019-11-19 | 东北大学 | A kind of method of prefabricated different water cut saturation degree rock mass of fracture network sample |
| AU2020100234A4 (en) * | 2020-02-18 | 2020-03-26 | Xi'an University Of Science And Technology | Method for water conservation mining by filling flexible strip |
| CN112067508A (en) * | 2020-09-11 | 2020-12-11 | 中国矿业大学 | Simulation device and simulation method for diffusion of overlying strata isolation grouting filling slurry |
| US20200408094A1 (en) * | 2018-09-30 | 2020-12-31 | China University Of Mining And Technology | Mine exploitation based on stoping, separation and filling control |
| AU2020103699A4 (en) * | 2020-11-11 | 2021-02-11 | Anhui University of Science and Technology | Drilled hole stratified filling method |
| CN113374522A (en) * | 2021-06-22 | 2021-09-10 | 中国煤炭地质总局一一九勘探队 | Solid waste coal gangue disposal grouting sedimentation reducing method |
| CN113374440A (en) * | 2021-05-28 | 2021-09-10 | 中煤科工集团西安研究院有限公司 | Rapid plugging method and construction method for water inrush channel of hidden collapse column |
| CN113700527A (en) * | 2021-08-30 | 2021-11-26 | 中国矿业大学 | High-strength coal gangue overlying rock isolation grouting filling green mining method for mining working face |
| CN113833467A (en) * | 2021-10-19 | 2021-12-24 | 中勘资源勘探科技股份有限公司 | Method for solving rock burst of coal field mining area through grouting filling |
-
2021
- 2021-12-27 CN CN202111611132.4A patent/CN114233380B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102704933A (en) * | 2012-05-25 | 2012-10-03 | 中国矿业大学 | Isolated-section grouting filling coal-mining method for mining overburden rock |
| CN103364534A (en) * | 2013-07-03 | 2013-10-23 | 中国矿业大学 | Mining overburden rock isolation grouting filling simulation experiment device and method |
| CN206174997U (en) * | 2016-10-25 | 2017-05-17 | 淮北工业建筑设计院有限责任公司 | It moves towards subregion and keeps apart slip casting and fill structure to adopt overlying strata |
| CN107989613A (en) * | 2017-11-14 | 2018-05-04 | 太原理工大学 | A kind of overlying strata separation layer subregion isolates grouting filling working seam complete extraction method |
| US20200408094A1 (en) * | 2018-09-30 | 2020-12-31 | China University Of Mining And Technology | Mine exploitation based on stoping, separation and filling control |
| CN110470522A (en) * | 2019-09-19 | 2019-11-19 | 东北大学 | A kind of method of prefabricated different water cut saturation degree rock mass of fracture network sample |
| AU2020100234A4 (en) * | 2020-02-18 | 2020-03-26 | Xi'an University Of Science And Technology | Method for water conservation mining by filling flexible strip |
| CN112067508A (en) * | 2020-09-11 | 2020-12-11 | 中国矿业大学 | Simulation device and simulation method for diffusion of overlying strata isolation grouting filling slurry |
| AU2020103699A4 (en) * | 2020-11-11 | 2021-02-11 | Anhui University of Science and Technology | Drilled hole stratified filling method |
| CN113374440A (en) * | 2021-05-28 | 2021-09-10 | 中煤科工集团西安研究院有限公司 | Rapid plugging method and construction method for water inrush channel of hidden collapse column |
| CN113374522A (en) * | 2021-06-22 | 2021-09-10 | 中国煤炭地质总局一一九勘探队 | Solid waste coal gangue disposal grouting sedimentation reducing method |
| CN113700527A (en) * | 2021-08-30 | 2021-11-26 | 中国矿业大学 | High-strength coal gangue overlying rock isolation grouting filling green mining method for mining working face |
| CN113833467A (en) * | 2021-10-19 | 2021-12-24 | 中勘资源勘探科技股份有限公司 | Method for solving rock burst of coal field mining area through grouting filling |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562330A (en) * | 2022-04-02 | 2022-05-31 | 中国矿业大学 | Method for controlling diffusion range of filling slurry for overburden rock isolation grouting |
| CN114562330B (en) * | 2022-04-02 | 2022-11-08 | 中国矿业大学 | Method for controlling diffusion range of filling slurry for overburden rock isolation grouting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114233380B (en) | 2023-12-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102705002B (en) | Roadside proper yielding unequal combined filling structure of gob-side entry retaining and construction method | |
| Chang et al. | Implementation of paste backfill mining technology in Chinese coal mines | |
| CN110723952B (en) | Phosphogypsum-based all-solid waste filler proportioning optimization method for improving filling roof contact rate | |
| CN110781587B (en) | Multi-objective optimization method for anti-segregation waste rock filling slurry by using low-quality solid waste | |
| CN103265248B (en) | Soil engineering filler mainly prepared from industrial waste, and preparation method and application thereof | |
| CN105152553A (en) | Green expansive cementing material based on salt chemical industry solid waste and building garbage, preparation method and applications thereof | |
| CN114233380B (en) | Method for isolating, grouting and filling overlying strata by using coal-based solid wastes | |
| CN104556917A (en) | High-early-strength filling material for coal mine goaf | |
| CN108609964A (en) | A kind of goaf grouting filler | |
| CN103452586A (en) | Gob expanding material prestressed filling method and prestressed filling material | |
| CN114622953B (en) | Coal mine gangue and CO 2 Mining overburden rock isolation grouting filling emission reduction method | |
| CN114472462A (en) | Underground-aboveground linkage coal gangue disposal system and disposal method | |
| Xuan et al. | Backfill mining practice in China coal mines | |
| CN117449900A (en) | Method for controlling stope rock stratum movement and earth surface subsidence | |
| Dong et al. | Experimental study on the compaction and deformation of filling gangue by reducing waste gangue for filling mining | |
| CN110130977A (en) | A kind of method of coal base solid waste slip casting fill system and slip casting | |
| CN114542171A (en) | Improvement method of overburden rock isolation grouting filling material | |
| CN102775105A (en) | Mine paste filling aggregate prepared from building waste materials and preparation method of mine paste filling aggregate | |
| CN107082604A (en) | A kind of coarse aggregate phosphorus ore cemented filling material defeated applied to big times of spool | |
| CN202578781U (en) | Layered load-bearing filling structure beside hard roof gob-side entry retaining | |
| CN113493336B (en) | Preparation method of fly ash-slag-based cemented filling material | |
| CN201473927U (en) | Face rockfill dam filled by mixture of hard rock and soft rock | |
| CN116515468B (en) | Coal mine goaf gangue returning slurry and preparation method thereof | |
| CN114907138A (en) | Grouting material for filling underground cavity | |
| CN116675473A (en) | Solid waste-based gel, paste, preparation method and filling method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |