CN113294154B - Method for reserving roadway in dead zone at bottom of ore drawing - Google Patents
Method for reserving roadway in dead zone at bottom of ore drawing Download PDFInfo
- Publication number
- CN113294154B CN113294154B CN202110394647.7A CN202110394647A CN113294154B CN 113294154 B CN113294154 B CN 113294154B CN 202110394647 A CN202110394647 A CN 202110394647A CN 113294154 B CN113294154 B CN 113294154B
- Authority
- CN
- China
- Prior art keywords
- ore
- roadway
- concrete
- isolation
- receiving
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000004567 concrete Substances 0.000 claims abstract description 44
- 238000002955 isolation Methods 0.000 claims abstract description 44
- 238000005553 drilling Methods 0.000 claims description 12
- 239000011435 rock Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 210000003462 vein Anatomy 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000035515 penetration Effects 0.000 claims 1
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 7
- 230000005641 tunneling Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000005065 mining Methods 0.000 description 8
- 238000005422 blasting Methods 0.000 description 3
- 239000011449 brick Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- 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
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
-
- 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
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
- E21F15/04—Stowing mats; Goaf wire netting; Partition walls
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)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Remote Sensing (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a method for reserving a roadway in a dead zone at the bottom of an ore drawing, which comprises the steps of manufacturing an isolation template in a dead zone roadway (a safe area) and pushing the isolation template into the dead zone roadway (the unsafe area), wherein a pouring retaining wall is arranged at an entrance of the isolation template, a top concrete pouring pipe, a side wall concrete pouring pipe and a communicated grouting hose are arranged at the isolation template, concrete can be poured into the isolation template, the dead zone between the roadway and the inner dead zone with a certain height at the top from bottom to top, the isolation template and the concrete are used as permanent supports of the roadway, and after the concrete is solidified, conventional filling operation is carried out from top to bottom of the dead zone, so that the method has the advantages of capability of reversely tunneling the roadway in the dead zone at the bottom, safety and reliability, low construction cost, high efficiency and the like and is suitable for being applied to the field of underground mine exploitation.
Description
Technical Field
The invention relates to the field of underground mining, in particular to a method for reserving a roadway in a dead zone at the bottom of a mine.
Background
In the field of underground mining, the segmented open-stope subsequent filling and the staged open-stope subsequent filling methods are generally as follows: filling ore receiving tunnels, ore discharging traversing tunnels (corresponding filling retaining walls are built in the tunnels) and the like in the goaf of the first-step ore room and the goaf of the bottom after the stope of the first-step ore room, and taking the ore receiving tunnels and the ore discharging traversing and dredging out of the first-step ore room in the filling body as the ore discharging tunnels of the second-step ore room after the strength of the filling body reaches a certain strength. Because the strength of the filling body is lower, the reverse tunneling method is an advanced pipe shed drilling and blasting method, and the advanced pipe shed is adopted for advanced support in rock drilling and blasting and roadway support in the filling body, so that the defects of high construction risk, high cost, slow construction progress, serious roadway overexcavation and the like exist.
In order to solve the above problems, many studies have been made at home and abroad: deep analysis of tunneling blasting parameters and supporting technology in a cemented filling body is carried out in paper (modern metallurgy, volume 40, period 5); chinese patent CN102748029B discloses a "sectional mining method", which is divided into a mine room and a pillar, wherein the mine room is opened first, then the pillar is cemented and filled, and then the pillar is mined and then the water and sand are filled; chinese patent CN106121643B discloses a "two-step nested combined filling mining method of reserved dado mine", which constructs a two-step stope environment by reserving a dado mine wall in a one-step stope on the basis of a conventional process, and then stopes the dado mine by reasonably arranging stope connecting lanes of the two-step stope, thereby reducing exposure time of unstable surrounding rocks, improving safety to a certain extent, but setting a dado pillar to cause reduction of stope rate; chinese patent CN104453904B discloses a "slot-free process", which also has some problems; the paper "new method of roadway formation in cemented filling mining method" (design and construction of metallurgical mine, 2 nd 1994) translates into Russian invention that by placing an elastic inflatable template in a goaf, then injecting a cemented filling material in the goaf, after the filling body is solidified and strengthened, removing the elastic inflatable template for the next use, in the method, because the cemented filling body has lower strength, after removing the elastic template, the peripheral filling body collapses, so the method still needs to be applied as a passive support such as a support steel arch frame and concrete support, and the cost is high, in addition, the strength of the elastic filling template is low, and the requirement on a high goaf cannot be met, so the method is not popularized and implemented; the paper (mining research and development volume 37, stage 1) introduces a method for manually building a red brick retaining wall in a goaf by casting reinforced concrete in red bricks to form an artificial wall body, paving steel rails and steel plates on the wall body as roadway top plates, and then injecting cementing filling materials in the goaf.
In summary, a great deal of research is carried out at home and abroad on the reserved roadway or the reversely excavated roadway after filling in the bottom dead zone, but no effective method and measures are found at present,
therefore, the development of a method for reserving a roadway in the dead zone at the bottom of the ore drawing is particularly urgent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for reserving a roadway in a dead zone at the bottom of a mine, which can not only stop operators from working under the dead zone and ensure the safety of the operators, but also reduce the process cost and save the mining investment.
The task of the invention is accomplished by the following technical scheme:
a method for setting up the top of the goaf includes such steps as making isolating template in the top of the goaf, putting it in the top of the goaf, pouring retaining wall at the entrance of isolating template, pouring concrete from bottom to top, and conventional filling from top to bottom.
Compared with the prior art, the invention has the following advantages or effects:
1. the difficult problem of the reverse tunneling construction of the tunnel in the bottom dead zone is solved.
2. The operation of workers in the empty area is stopped, and the safety and the reliability are improved.
3. The construction cost is reduced, and the construction efficiency is improved.
Drawings
FIG. 1 is a plan view of a method for reserving a roadway in a dead zone at the bottom of a mine according to the present invention.
Fig. 2 is a vertical projection view of a method for setting up a roadway in a dead zone at the bottom of a mine according to the present invention.
Fig. 3 is an enlarged schematic view of a main structure of a method for setting up a roadway in a dead zone at the bottom of a mine according to the present invention.
The reference symbols in the drawings indicate:
1. a first step bottom pulling and receiving roadway 2, a second step bottom pulling and receiving roadway 3, a lower disc conveying roadway 4, an upper disc conveying roadway 5, an ore drawing traversing 6, a rock drilling penetrating vein 7, a rock drilling roadway 8, a concrete pouring area 9, a filling area 10, an unexplored mining area 11, an isolation retaining wall 12, a top concrete pouring pipe 13, a side concrete pouring pipe 14, a grouting hose 15, a first step pouring concrete 16, a second step pouring concrete 17, an ore drawing hopper
The description is described in further detail below with reference to the accompanying drawings.
Detailed Description
As shown in fig. 1=3, the method for setting up the goaf at the bottom of the ore is characterized in that an isolation template (11) is manufactured in a goaf roadway (safe area) and pushed into the goaf roadway (unsafe area), pouring retaining walls are arranged at the inlets and outlets of the isolation template (11), a top concrete pouring pipe (12), a side wall concrete pouring pipe (13) and a communicated grouting hose (14) are arranged on the isolation template (11), concrete can be poured into the isolation template (11), the goaf between the roadway and the goaf at a certain height from bottom to top, the isolation template (11) and the concrete are used as permanent supports of the roadway, and after the concrete is solidified, conventional filling operation is carried out from top of the goaf to bottom.
The method of the invention may further be:
the specific process steps and conditions of the method are as follows:
A. ore body stoping and ore extraction: driving a first-step bottom pulling and ore receiving roadway (1), a second-step bottom pulling and ore receiving roadway (2), a lower disc conveying roadway (3) and an upper disc conveying roadway (4), driving a plurality of ore drawing transverse directions (5) between the first-step bottom pulling and ore receiving roadway (1) and the second-step bottom pulling and ore receiving roadway (2), forming an ore drawing funnel (17) on the first-step bottom pulling and ore receiving roadway (1), driving a downward hole of ore bodies of the first-step bottom pulling and ore receiving roadway (1) through an upper rock drilling through vein (6) and a rock drilling roadway (7), realizing ore body ore falling of the first-step bottom pulling and ore receiving roadway (1), and discharging ore bodies of the first-step bottom pulling and ore receiving roadway (1) from eight ore drawing holes through two outlets on two sides of the first-step bottom pulling and ore receiving roadway (1), the ore drawing transverse directions (5) and six second-step bottom pulling and ore receiving roadway (2);
B. installing an isolation template and a retaining wall: after the ore body is blasted out from the ore body by the bottom pulling and receiving roadway (1) in one step, pushing the isolation templates (11) assembled in the non-empty area roadway on the side of the lower disc conveying roadway (3) to the side of the upper disc conveying roadway (4), and arranging the isolation templates (11) in the non-empty area by the bottom pulling and receiving roadway (1) in one step; assembling an isolation template (11) in a non-empty area roadway of the ore removal traversing (5) close to the two-step bottom pulling and ore receiving roadway (2), pushing the isolation template (11) to overlap the side of the ore removal traversing (5) and the ore receiving roadway (1) to the bottom pulling and ore receiving roadway (1), fully installing the ore removal traversing (5) empty area roadway, and finally arranging eight isolation retaining walls at the inlet and outlet of the isolation template (11);
C. pouring concrete from bottom to top to form a permanent support: pouring a step of concrete between the side wall of the isolation template (11) and the roadway space area through a grouting hose (14) and a concrete pouring pipe (12) at the top of the isolation retaining wall in the non-goaf roadway, and pouring a two-step concrete between the upper part of the isolation template (11) and the roadway space area through a grouting hose (14) and a concrete pouring pipe (13) at the side wall of the isolation retaining wall after the concrete of the step is solidified;
D. the upper is penetrated by a conventional filling and isolating template from top to bottom: after the concrete in the two steps is solidified, conventional filling materials are filled from top to bottom through the upper rock drilling through vein (6) and the rock drilling lane (7), the whole one-step goaf is filled, and the lap joint of the isolation template (11) of the one-step bottom roadway (1) and the isolation template (11) in the ore removal traversing (5) is penetrated.
E. And (3) stoping a two-step ore body: the ore body of the same step is subjected to ore receiving and ore falling in two-step ore bodies at two sides of a filled empty area of the first step, and the ore body of the second step is subjected to ore discharging through a bottom pulling step, an ore receiving roadway (1) and an ore discharging traversing (5).
The isolation template (11) can be formed by welding a steel plate with the thickness of 8 mm.
The top concrete pouring pipe (12) and the side wall concrete pouring pipe (13) are steel pipes with the thickness of 30 mm.
The position of the bottom pulling and ore receiving roadway (1) and the ore outlet traversing (5) in one step is sealed by a rubber leakage-proof ring.
In the embodiment, the casting concrete strength C30, the casting concrete thickness of the top plate of the isolation template is 1.5m, and the length of the grouting pipe of the top plate is 2.0m.
As described above, the present invention can be preferably realized. The above embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be made in equivalent ways, and are included in the scope of the present invention.
Claims (4)
1. The method for reserving the roadway in the dead zone at the bottom of the ore drawing is characterized in that an isolation template (11) is manufactured in a non-dead zone roadway and pushed into the dead zone roadway, pouring retaining walls are arranged at the inlet and outlet of the isolation template (11), a top concrete pouring pipe (12), a side concrete pouring pipe (13) and a grouting hose (14) communicated with the side concrete pouring pipe are arranged on the isolation template (11), concrete can be poured into the isolation template (11), the dead zone and the inner dead zone with a certain height at the top from bottom to top, the isolation template (11) and the concrete are used as permanent supports of the roadway, and after the concrete is solidified, conventional filling operation is carried out from top to bottom of the dead zone, and the concrete process steps and conditions are as follows:
A. ore body stoping and ore extraction: driving a first-step bottom pulling and ore receiving roadway (1), a second-step bottom pulling and ore receiving roadway (2), a lower disc conveying roadway (3) and an upper disc conveying roadway (4), driving a plurality of ore drawing transverse directions (5) between the first-step bottom pulling and ore receiving roadway (1) and the second-step bottom pulling and ore receiving roadway (2), forming an ore drawing funnel (17) on the first-step bottom pulling and ore receiving roadway (1), driving a downward hole of ore bodies of the first-step bottom pulling and ore receiving roadway (1) through an upper rock drilling through vein (6) and a rock drilling roadway (7), realizing ore body ore falling of the first-step bottom pulling and ore receiving roadway (1), and discharging ore bodies of the first-step bottom pulling and ore receiving roadway (1) from eight ore drawing holes through two outlets on two sides of the first-step bottom pulling and ore receiving roadway (1), the ore drawing transverse directions (5) and six second-step bottom pulling and ore receiving roadway (2);
B. installing an isolation template and a retaining wall: after the ore body is blasted out from the ore body by the bottom pulling and receiving roadway (1) in one step, pushing the isolation templates (11) assembled in the non-empty area roadway on the side of the lower disc conveying roadway (3) to the side of the upper disc conveying roadway (4), and arranging the isolation templates (11) in the non-empty area by the bottom pulling and receiving roadway (1) in one step; assembling an isolation template (11) in a non-empty area roadway of the ore removal traversing (5) close to the two-step bottom pulling and ore receiving roadway (2), pushing the isolation template (11) to overlap the side of the ore removal traversing (5) and the ore receiving roadway (1) to the bottom pulling and ore receiving roadway (1), fully installing the ore removal traversing (5) empty area roadway, and finally arranging eight isolation retaining walls at the inlet and outlet of the isolation template (11);
C. pouring concrete from bottom to top to form a permanent support: a step of concrete pouring is carried out between the side wall of the isolation template (11) and the roadway empty area through a connection grouting hose (14) and a top concrete pouring pipe (12) in the non-empty area roadway, and after the concrete poured in the step is solidified, a step of concrete pouring (16) is carried out between the upper part of the isolation template (11) and the roadway empty area through a connection grouting hose (14) and a side concrete pouring pipe (13) of the isolation template (11);
D. conventional filling and isolating retaining wall penetrating from top to bottom: after the two-step casting concrete (16) is solidified, filling conventional filling materials from top to bottom through the upper rock drilling through vein (6) and the rock drilling lane (7), filling the whole one-step ore body empty area, and enabling the lap joint of the isolation template (11) of the one-step bottom pulling and ore receiving lane (1) and the isolation template (11) in the ore discharging traversing (5) to realize the penetration;
E. and (3) stoping a two-step ore body: the ore body of the same step is subjected to ore receiving and ore falling in two-step ore bodies at two sides of a filled empty area of the first step, and the ore body of the second step is subjected to ore discharging through a bottom pulling step, an ore receiving roadway (1) and an ore discharging traversing (5).
2. A method according to claim 1, characterized in that the spacer form (11) is welded from 8mm thick steel plates.
3. The method according to claim 1, characterized in that the top concrete pouring pipe (12) and the side concrete pouring pipe (13) are 30mm steel pipes.
4. The method of claim 1, wherein the one-step bottom pulling and receiving roadway (1) and ore removal traverse (5) are closed by rubber leakage-proof rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110394647.7A CN113294154B (en) | 2021-04-13 | 2021-04-13 | Method for reserving roadway in dead zone at bottom of ore drawing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110394647.7A CN113294154B (en) | 2021-04-13 | 2021-04-13 | Method for reserving roadway in dead zone at bottom of ore drawing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113294154A CN113294154A (en) | 2021-08-24 |
| CN113294154B true CN113294154B (en) | 2023-10-03 |
Family
ID=77319736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110394647.7A Active CN113294154B (en) | 2021-04-13 | 2021-04-13 | Method for reserving roadway in dead zone at bottom of ore drawing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113294154B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1023089A1 (en) * | 1982-02-08 | 1983-06-15 | Московский Ордена Трудового Красного Знамени Горный Институт | Method of underground mining of ore deposits |
| CN101696637A (en) * | 2009-10-09 | 2010-04-21 | 中国矿业大学 | Coal and gas separation bin and method thereof |
| CN103603676A (en) * | 2013-11-21 | 2014-02-26 | 长沙矿山研究院有限责任公司 | Scraper roadway supporting method |
| CN203685245U (en) * | 2014-02-20 | 2014-07-02 | 陕西开拓建筑科技有限公司 | Flexible formwork gob-side entry retaining hydraulic support |
| CN106677787A (en) * | 2016-12-27 | 2017-05-17 | 中冶集团武汉勘察研究院有限公司 | Vertical shaft restoration and reinforcement structure and restoration and reinforcement construction method |
| CN108533265A (en) * | 2018-05-22 | 2018-09-14 | 福州大学 | The filling mining method of foundation is assembled using concrete component |
-
2021
- 2021-04-13 CN CN202110394647.7A patent/CN113294154B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1023089A1 (en) * | 1982-02-08 | 1983-06-15 | Московский Ордена Трудового Красного Знамени Горный Институт | Method of underground mining of ore deposits |
| CN101696637A (en) * | 2009-10-09 | 2010-04-21 | 中国矿业大学 | Coal and gas separation bin and method thereof |
| CN103603676A (en) * | 2013-11-21 | 2014-02-26 | 长沙矿山研究院有限责任公司 | Scraper roadway supporting method |
| CN203685245U (en) * | 2014-02-20 | 2014-07-02 | 陕西开拓建筑科技有限公司 | Flexible formwork gob-side entry retaining hydraulic support |
| CN106677787A (en) * | 2016-12-27 | 2017-05-17 | 中冶集团武汉勘察研究院有限公司 | Vertical shaft restoration and reinforcement structure and restoration and reinforcement construction method |
| CN108533265A (en) * | 2018-05-22 | 2018-09-14 | 福州大学 | The filling mining method of foundation is assembled using concrete component |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113294154A (en) | 2021-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112031775B (en) | Novel coal mine rock burst treatment method | |
| CN103615285B (en) | A kind of stope route arrangement and method being beneficial to Tight filling | |
| CN103967493B (en) | A kind of slight slope and thin ore body ore pillar mining codes | |
| CN112855223A (en) | Integrated grouting method for coal roadway penetrating through goaf wall rear-advance curtain space | |
| CN113202475B (en) | Filling caving mining method | |
| CN105735995A (en) | Gob-side roadway retaining method based on roof cutting of soft roof plate | |
| AU2016422571A1 (en) | Method for recovering room-mining coal pillars by solid filling in synergy with artificial pillars | |
| CN111663950A (en) | Advanced support and earth pressure unloading mining method | |
| CN110439574A (en) | It is originated for shield lateral translation and the tunnel structure and construction method of haul of slagging tap | |
| CN113803074A (en) | Construction method of tunnel structure for artificial and mechanical combined obstacle removal of water-rich sand layer | |
| CN111997616A (en) | Method for continuously recycling residual top-bottom column by adopting large section | |
| CN113356851B (en) | Continuous downward medium-length hole segmented open stoping subsequent filling mining method for medium-thickness ore body | |
| CN117108283B (en) | Fluidized coal mining method utilizing self energy storage of coal seam | |
| CN111749697B (en) | Stope mining-preparation engineering linking method | |
| CN113294154B (en) | Method for reserving roadway in dead zone at bottom of ore drawing | |
| CN112780276A (en) | Fully-closed blasting pressure relief structure for grouting reconstruction of composite roof and self-retained roadway method | |
| CN116398165A (en) | New tunnel penetrating through existing station at zero distance and construction method thereof | |
| CN114017030B (en) | Upward continuous mining method for re-constructing ore-drawing structure in roof caving area of stage stope | |
| CN109882172A (en) | A kind of cut falls the gob-side entry retaining method that roadside support wall is done on directly top | |
| CN111980704B (en) | Stope top-contacting filling method suitable for downward high-sublevel filling mining method | |
| CN113187481A (en) | Filling mining method for overburden rock concentrated grouting caving stoping | |
| CN112610212A (en) | Mining area one-way tunneling coal-pillar-free mining method | |
| CN112412461A (en) | Open-pit mine end slope coal filling mining process method | |
| CN105386767A (en) | Mining method of open stope-caving mixed mining hanging wall | |
| CN212406806U (en) | Coal mine underground sealing wall |
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 |