CN114542174A - Controllable grouting filling method in roadway - Google Patents
Controllable grouting filling method in roadway Download PDFInfo
- Publication number
- CN114542174A CN114542174A CN202210180139.3A CN202210180139A CN114542174A CN 114542174 A CN114542174 A CN 114542174A CN 202210180139 A CN202210180139 A CN 202210180139A CN 114542174 A CN114542174 A CN 114542174A
- Authority
- CN
- China
- Prior art keywords
- filled
- roadway
- grouting
- filling method
- grouting pipe
- 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
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000000903 blocking effect Effects 0.000 claims abstract description 23
- 239000011440 grout Substances 0.000 claims abstract description 20
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 239000003245 coal Substances 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 15
- 239000011435 rock Substances 0.000 abstract description 11
- 239000002699 waste material Substances 0.000 abstract description 5
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 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
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)
Abstract
The invention discloses a controllable grouting filling method in a roadway, which comprises the following steps: determining a roadway to be filled, and embedding grout blocking walls at equal intervals in an area to be filled of the roadway to be filled; building a grout blocking wall in an area to be filled, and reserving a shuttling hole on the grout blocking wall; installing a grouting device on the top wall of the roadway to be filled, and grouting the area to be filled through the grouting device; and (5) circulating the steps S1-S3 until the whole roadway to be filled is filled. The method arranges thick plugging walls in the roadway, and realizes the withdrawal movement of the grouting pipes through the grouting devices; on the basis of calculating on-way resistance, a proper slope angle is designed, slurry is injected into a post-mining space, gaps of broken waste rocks are filled, the compression ratio of the broken waste rocks is reduced, meanwhile, the broken rocks are reinforced, and the bearing performance of the broken rock is improved.
Description
Technical Field
The invention relates to the technical field of filling and grouting, in particular to a controllable grouting filling method in a roadway.
Background
The filling mining technology is an ideal way for mining the pressed coal under the building, has the advantages of high recovery rate, good effect of controlling overlying strata movement and slowing down surface subsidence, capability of treating coal-based solid waste materials and the like, but the existing filling mining technology is to fill the goaf before the direct roof of the goaf is collapsed, and the roof condition of the existing filling mining technology ensures that the working face has certain filling time and space, so the filling mining technology is suitable for the roof condition of medium stability and above. The occurrence conditions of coal seams in China are complex, and the coal reserves directly ejecting broken roof plates occupy a considerable proportion of the total coal reserves in China. The fracture of the joint of the broken roof is developed, the integrity is poor, the self-stability is low, the characteristic of being adopted and emitted at any time is achieved on the premise of not adopting other supporting measures, necessary time and space cannot be provided for filling, and continuous filling mining of the working face of the broken roof cannot be (or is difficult to be) realized by the existing filling mining technology. Therefore, how to realize filling mining of broken roof coal seams is a difficult problem for coal technologists. Aiming at the limitations of the existing filling mining technology and the characteristics of a broken top plate, based on the movement law of the overlying strata, the controllable grouting filling method in the roadway is provided, namely grouting filling is carried out on broken waste rocks in an caving goaf, gaps of the broken waste rocks are filled, the compression rate of the broken waste rocks is reduced, meanwhile, the broken rocks are reinforced, the bearing performance of the broken rock is improved, and the purposes of controlling the movement of the overlying strata and slowing down the settlement of the earth surface are finally achieved.
The controllable grouting filling method in the roadway can realize underground safe disposal of coal-based solid waste materials such as coal gangue and the like, and has important significance for reducing occupied farmland and protecting environment. Meanwhile, the controllable grouting filling method in the roadway is not limited by the roof condition of the working face, and has important significance for expanding the application of the filling mining technology in coal mines. Furthermore, the controllable grouting filling method in the roadway is used as a brand new filling mining new idea and has important significance for enriching the filling mining technical system in China.
Disclosure of Invention
The invention aims to provide a controllable grouting filling method in a roadway, which is used for solving the problems in the prior art and can realize the purposes of filling a post-mining space and slowing down surface settlement.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a controllable grouting filling method in a roadway, which comprises the following steps:
s1, determining a roadway to be filled, and embedding grout blocking walls at equal intervals in an area to be filled of the roadway to be filled;
s2, constructing a grout blocking wall in the area to be filled, and reserving a shuttling hole on the grout blocking wall;
s3, mounting a grouting device on the top wall of the roadway to be filled, and grouting the area to be filled through the grouting device;
s4 loops the above steps S1-S3 until the whole roadway to be filled is filled.
The distance between the adjacent embedded grout blocking walls is 28-32 m.
The thickness of the slurry blocking wall is 0.25-0.4 m; the shuttling hole is formed in the top of the grout blocking wall and close to the side of the coal wall.
The grouting device comprises an inner grouting pipe, a shuttle trailer, a booster pump and an outer grouting pipe; the outer grouting pipe is communicated with the feed end of the booster pump; the discharge end of the booster pump is connected with one end of an inner grouting pipe; the other end of the inner grouting pipe penetrates through the shuttle hole and is arranged in the area to be filled; the shuttle type trailer is arranged at the shuttle hole, and the inner grouting pipe is hung at the bottom of the shuttle type trailer; the booster pump is placed in an unfilled region.
The inner grouting pipe is arranged at the area to be filled and is fixedly provided with a hanging ring; the outer wall of the bottom of the shuttle trailer is provided with a hook; the inner grouting pipe is hung on the hook through the hanging ring;
the other end of the inner grouting pipe is horizontally erected on the unfilled region roadway through a towing hook, and the slope rising angle formed by the middle part of the inner grouting pipe and the horizontal section of the inner grouting pipe is alpha.
The hooks are arranged on the side close to the coal wall at equal intervals; and the vertical distance between the hook and the bottom wall of the roadway to be filled is 1 m.
The shuttle trailer comprises a trailer chain, a driving wheel and a driven wheel; the trailer chain is laid at the position, close to the coal wall, of the top wall of the roadway to be filled; the centers of the driving wheel and the driven wheel are both provided with chain teeth, and the driving wheel and the driven wheel are in chain transmission connection through a transmission chain; the driving wheel and the driven wheel are rotatably arranged on the trailer chain.
A rotating motor is also arranged in the driving wheel; the rotating motor is arranged in the driving wheel, and two ends of the rotating motor are connected with the driving wheel through rotating rods in a transmission mode.
A controller is arranged in the booster pump and electrically connected with the rotating motor.
An embedded steel wire is embedded in the inner grouting pipe.
The invention discloses the following technical effects: the method arranges thick plugging walls in the roadway, and realizes the withdrawal movement of the grouting pipes through the grouting devices; on the basis of calculating on-way resistance, a proper slope angle is designed, grout is injected into a post-mining space, gaps of broken gangue are filled, the compression ratio of the broken gangue is reduced, meanwhile, broken rock is reinforced, and the bearing performance of the broken rock is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of the overall structure;
FIG. 2 is a schematic view of a shuttle trailer configuration;
FIG. 3 is a schematic view of a driving wheel;
FIG. 4 is a schematic view of a driven wheel construction;
FIG. 5 is a schematic view of a drive train configuration;
FIG. 6 is a schematic view of a grouting pipe structure;
wherein, 1-filled roadway; 2-plugging a slurry wall; 3-a roadway to be filled; 4-pipeline nozzle; 5-driven wheel; 6-a shuttle hole; 7-a transmission chain; 8-shuttle trailer; 9-driving wheel; 10-inner grouting pipe; 11-embedding a grout blocking wall; 12-a trailer chain; 13-a control line; 14-roadway top slope to be filled; 15-a booster pump; 16-a controller; 17-an outer grouting pipe; 18-a tow hook; 19-roadway bottom slope to be filled; 20-step-up pressure gauge; 21-back pressure gauge; 22-sprocket; 23-a rotating electric machine; 24-rotating rods; 25-hanging hooks; 26-embedded steel wires; 27-hanging ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a controllable grouting filling method in a roadway, which comprises the following steps:
s1, determining the roadway 3 to be filled, and embedding the grout blocking walls 11 at equal intervals in the area to be filled of the roadway 3 to be filled;
s2, constructing a grout blocking wall 2 in an area to be filled, and reserving a shuttling hole 6 on the grout blocking wall 2;
s3, mounting a grouting device on the top wall of the roadway 3 to be filled, and grouting the area to be filled through the grouting device;
s4 loops through the above steps S1-S3 until the entire roadway 3 to be filled is filled.
The distance between the adjacent embedded grout blocking walls 11 is 28-32 m.
The thickness of the slurry blocking wall 2 is 0.25m-0.4 m; the shuttle-passing hole 6 is arranged at the top of the slurry blocking wall 2 close to the side of the coal wall.
The grouting device comprises an inner grouting pipe 10, a shuttle trailer 8, a booster pump 15 and an outer grouting pipe 17; the outer grouting pipe 17 is communicated with the feed end of the booster pump 15; the discharge end of the booster pump 15 is connected with one end of an inner grouting pipe 10; the other end of the inner grouting pipe 10 penetrates through the shuttle hole 6 and is arranged in the area to be filled; the shuttle trailer 8 is arranged at the shuttle hole 6, and an inner grouting pipe 10 is hung at the bottom of the shuttle trailer 8; the booster pump 15 is placed in the unfilled region.
The inner grouting pipe 10 is fixedly arranged at the region to be filled and is fixedly provided with a hanging ring 27; the outer wall of the bottom of the shuttle trailer 8 is provided with a hook 25; the inner grouting pipe 10 is hung on the hook 25 through a hanging ring 27;
the other end of the inner grouting pipe 10 is horizontally erected on an unfilled region roadway through a towing hook 18, and the rising angle formed by the middle part of the inner grouting pipe 10 and the horizontal section of the inner grouting pipe 10 is alpha.
The hooks 17 are arranged on the side close to the coal wall at equal intervals; and the vertical distance between the hook 17 and the roadway bottom wall 14 to be filled is 1 m.
The shuttle trailer 8 comprises a trailer chain 12, a driving wheel 9 and a driven wheel 5; the trailer chain 12 is laid at the position of the top wall 14 of the roadway to be filled, which is close to the coal wall; the centers of the driving wheel 9 and the driven wheel 5 are both provided with chain teeth 22, and the driving wheel 9 and the driven wheel 5 are in transmission connection through a transmission chain 7; the driving wheel 9 and the driven wheel 5 are rotatably mounted on a trailer chain 12.
A rotating motor 23 is also arranged in the driving wheel; the rotating motor 23 is arranged in the driving wheel 9, and two ends of the rotating motor 23 are in transmission connection with the driving wheel 9 through a rotating rod 24.
The booster pump is internally provided with a controller 16, and the controller 16 is electrically connected with a rotating motor 23.
An embedded steel wire 26 is also embedded in the inner grouting pipe 10.
In one embodiment of the invention, a filled roadway 1 and a roadway 3 to be filled are separated by a grout blocking wall 2; and after filling is completed, the shuttle holes are also filled with the slurry and sealed.
In one embodiment of the invention, the inner grouting pipe 10 is arranged at the end of the roadway 3 to be filled and is provided with a pipeline nozzle; the inner grouting pipe 10 moves along with the shuttle trailer 8; the slope angle alpha of the horizontal section and the hanging section of the inner grouting pipe 10 is the calculated angle when the on-way resistance is minimum.
Further, when the transmission chain 7 controls the inner grouting pipe 10 to move, the booster pump also pushes forwards along with the coal face;
the tow hook is arranged in the side part of the roadway, the whole roadway is arranged in advance, the tow hook of the lower part of the shuttle trailer and the slope raising section is detached, and the tow hook is applied to the next grouting roadway.
In one embodiment of the invention, the controller 16 controls the rotary motor 23 via the control line 13, and the rotary motor 23 effects the movement of the driving wheel 9 and the driven wheel 5 on the trailer chain 12 via the transmission chain 7 and the sprocket 22 by rotating the rod 24, while the booster pump 15 also moves forward.
In an embodiment of the invention, the trailer chain 12 penetrates through the shuttle hole 6 at each corresponding position, and when the inner grouting pipe 10 is required to completely fill the roadway 3 to be filled in one area, the inner grouting pipe 10 is moved and placed in the next roadway 3 to be filled.
In one embodiment of the present invention, the booster pump 15 is further provided with a booster gauge 20 and a back pressure gauge 21; the booster pump 15 controls the flow of the slurry in the grouting pipe by a booster gauge 20 and a back pressure gauge 21 thereon.
In one embodiment of the present invention, the inner slurry pipe 10 is a hose.
Furthermore, the steel wires are arranged in the grouting pipes to increase the flexibility of the grouting pipes and prevent the grouting pipes from being damaged when accidents happen to the top plate or the side part of the roadway.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. A controllable grouting filling method in a roadway is characterized by comprising the following steps:
s1, determining a roadway to be filled, and embedding grout blocking walls at equal intervals in an area to be filled of the roadway to be filled;
s2, constructing a grout blocking wall in the area to be filled, and reserving a shuttling hole on the grout blocking wall;
s3, mounting a grouting device on the top wall of the roadway to be filled, and grouting the area to be filled through the grouting device;
s4 loops the above steps S1-S3 until the whole roadway to be filled is filled.
2. The controllable grouting filling method in the roadway according to claim 1, characterized in that: the distance between the adjacent embedded grout blocking walls is 28-32 m.
3. The controllable grouting filling method in the roadway according to claim 1, characterized in that: the thickness of the slurry blocking wall is 0.25-0.4 m; the shuttling hole is formed in the top of the grout blocking wall and close to the side of the coal wall.
4. The controllable grouting filling method in the roadway according to claim 1, characterized in that: the grouting device comprises an inner grouting pipe, a shuttle trailer, a booster pump and an outer grouting pipe; the outer grouting pipe is communicated with the feed end of the booster pump; the discharge end of the booster pump is connected with one end of an inner grouting pipe; the other end of the inner grouting pipe penetrates through the shuttle hole and is arranged in the area to be filled; the shuttle type trailer is arranged at the shuttle hole, and the inner grouting pipe is hung at the bottom of the shuttle type trailer; the booster pump is placed in an unfilled region.
5. The controllable grouting filling method in the roadway according to claim 4, characterized in that: the inner grouting pipe is arranged at the area to be filled and is fixedly provided with a hanging ring; the outer wall of the bottom of the shuttle trailer is provided with a hook; the inner grouting pipe is hung on the hook through the hanging ring;
the other end of the inner grouting pipe is horizontally erected on the unfilled region roadway through a towing hook, and the slope rising angle formed by the middle part of the inner grouting pipe and the horizontal section of the inner grouting pipe is alpha.
6. The controllable grouting filling method in the roadway according to claim 5, characterized in that: the hooks are arranged on the side close to the coal wall at equal intervals; and the vertical distance between the hook and the bottom wall of the roadway to be filled is 1 m.
7. The controllable grouting filling method in the roadway according to claim 4, wherein: the shuttle trailer comprises a trailer chain, a driving wheel and a driven wheel; the trailer chain is laid at the position, close to the coal wall, of the top wall of the roadway to be filled; the centers of the driving wheel and the driven wheel are both provided with sprockets, and the driving wheel and the driven wheel are connected in a transmission manner through a transmission chain; the driving wheel and the driven wheel are rotatably arranged on the trailer chain.
8. The controllable grouting filling method in the roadway according to claim 7, characterized in that: a rotating motor is also arranged in the driving wheel; the rotating motor is arranged in the driving wheel, and two ends of the rotating motor are connected with the driving wheel through rotating rods in a transmission mode.
9. The controllable grouting filling method in the roadway according to claim 8, characterized in that: a controller is arranged in the booster pump and electrically connected with the rotating motor.
10. The controllable grouting filling method in the roadway according to claim 4, characterized in that: an embedded steel wire is embedded in the inner grouting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210180139.3A CN114542174B (en) | 2022-02-25 | 2022-02-25 | Controllable grouting filling method in roadway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210180139.3A CN114542174B (en) | 2022-02-25 | 2022-02-25 | Controllable grouting filling method in roadway |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114542174A true CN114542174A (en) | 2022-05-27 |
| CN114542174B CN114542174B (en) | 2023-02-28 |
Family
ID=81679324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210180139.3A Active CN114542174B (en) | 2022-02-25 | 2022-02-25 | Controllable grouting filling method in roadway |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114542174B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425454A (en) * | 2011-09-22 | 2012-04-25 | 中国矿业大学 | Construction method of walling and filling combined gob-side entry retaining wall body |
| CN203394582U (en) * | 2013-08-05 | 2014-01-15 | 北京科技大学 | Grouting type filling retaining wall and goaf filling system |
| CN105317459A (en) * | 2015-11-19 | 2016-02-10 | 中国矿业大学(北京) | Subarea filling method used for controlling large-area falling disaster of hard roof |
| CN108625894A (en) * | 2018-06-25 | 2018-10-09 | 山东科技大学 | The waste filling solid grouting construction method of the flat working face of shortwall lane water acquisition |
| CN108798770A (en) * | 2018-06-25 | 2018-11-13 | 山东科技大学 | Waste filling grouting construction method suitable for the flat working face of shortwall lane water acquisition |
| US20200040727A1 (en) * | 2018-08-02 | 2020-02-06 | Xiexing Miao | Method for mining ultra-thick coal seam by utilizing goaf solid backfilling technique |
| CN113187486A (en) * | 2021-06-03 | 2021-07-30 | 华北科技学院(中国煤矿安全技术培训中心) | Gob-side entry driving method for deep well without coal pillar and formed entry |
| WO2021237912A1 (en) * | 2020-05-26 | 2021-12-02 | 山东科技大学 | Subsidence-restricted stoping method for false mined-out layer support formed in combination with waste rock |
-
2022
- 2022-02-25 CN CN202210180139.3A patent/CN114542174B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425454A (en) * | 2011-09-22 | 2012-04-25 | 中国矿业大学 | Construction method of walling and filling combined gob-side entry retaining wall body |
| CN203394582U (en) * | 2013-08-05 | 2014-01-15 | 北京科技大学 | Grouting type filling retaining wall and goaf filling system |
| CN105317459A (en) * | 2015-11-19 | 2016-02-10 | 中国矿业大学(北京) | Subarea filling method used for controlling large-area falling disaster of hard roof |
| CN108625894A (en) * | 2018-06-25 | 2018-10-09 | 山东科技大学 | The waste filling solid grouting construction method of the flat working face of shortwall lane water acquisition |
| CN108798770A (en) * | 2018-06-25 | 2018-11-13 | 山东科技大学 | Waste filling grouting construction method suitable for the flat working face of shortwall lane water acquisition |
| US20200040727A1 (en) * | 2018-08-02 | 2020-02-06 | Xiexing Miao | Method for mining ultra-thick coal seam by utilizing goaf solid backfilling technique |
| WO2021237912A1 (en) * | 2020-05-26 | 2021-12-02 | 山东科技大学 | Subsidence-restricted stoping method for false mined-out layer support formed in combination with waste rock |
| CN113187486A (en) * | 2021-06-03 | 2021-07-30 | 华北科技学院(中国煤矿安全技术培训中心) | Gob-side entry driving method for deep well without coal pillar and formed entry |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114542174B (en) | 2023-02-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108915764B (en) | A kind of method of reserved tunnel consolidated fill recycling room formula coal column | |
| CN103883350B (en) | The filling coal mining method of adopting is jumped at a kind of interval | |
| CN109826665B (en) | Gangue and high-water-content material mixed filling method | |
| CN106014344B (en) | Environment-friendly water-holding coal and uranium coordinated mining system and application method thereof | |
| CN103437768B (en) | Pre-set space filling mining method without top column and bottom column | |
| CN104532818A (en) | Treatment method for strip mine goaf | |
| CN112253115B (en) | Near-horizontal coal seam roadway type cemented filling mining method | |
| CN106907177B (en) | A kind of girdle gob side entry retaining roadside packing method for protecting support | |
| CN104775819A (en) | Deep inclined coal seam mining roadway mine pressure control mining method | |
| CN102877858A (en) | Reinforcing method for crushed top plate of coal face | |
| CN113653492B (en) | Method for preventing rock burst in filling mining | |
| CN111411962A (en) | Coal mine rock burst treatment method | |
| CN104632220A (en) | Mining method with adjustable and controllable structure size of gentle dip medium-thickness ore body strip column reconstructed stope | |
| CN103993881A (en) | Long-wall roadway type cemented filling mining method | |
| CN105443143A (en) | Tunnel support device of coal mine goaf and construction method thereof | |
| CN108468564A (en) | A kind of flat seam lane formula consolidated fill method | |
| CN105089693A (en) | Goaf-side-roadway-retaining wall roof-contact improving method | |
| CN113153295A (en) | Mining method for extremely thick hard coal | |
| CN104088637B (en) | A kind of residual coal second mining of upper group shallow embedding method under coal seam group condition | |
| CN108590716A (en) | A kind of tunnel crosses rich water tomography tree root type and dredges water blockoff integral construction method | |
| CN114542174B (en) | Controllable grouting filling method in roadway | |
| CN110644993B (en) | Z-shaped strip working face mining method | |
| CN116517617A (en) | Coal gangue-based waste underground stoping roadway chamber filling method | |
| CN107013213B (en) | A kind of method that pattern presets tunnel | |
| CN114776368A (en) | System for adopt to fill and stay integration and combine and adopt waste filling working face |
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 |