CN108457653B - Gob-side entry retaining method for pre-cracked top plate of advanced deep hole - Google Patents
Gob-side entry retaining method for pre-cracked top plate of advanced deep hole Download PDFInfo
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- CN108457653B CN108457653B CN201810151194.3A CN201810151194A CN108457653B CN 108457653 B CN108457653 B CN 108457653B CN 201810151194 A CN201810151194 A CN 201810151194A CN 108457653 B CN108457653 B CN 108457653B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000004567 concrete Substances 0.000 claims abstract description 44
- 239000011435 rock Substances 0.000 claims abstract description 21
- 239000003245 coal Substances 0.000 claims abstract description 19
- 238000005422 blasting Methods 0.000 claims abstract description 17
- 239000010878 waste rock Substances 0.000 claims abstract description 8
- 238000005065 mining Methods 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 11
- 238000005336 cracking Methods 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 2
- 230000003313 weakening effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims 1
- 239000002360 explosive Substances 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract 1
- 239000011372 high-strength concrete Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 10
- 239000000835 fiber Substances 0.000 description 8
- 238000007789 sealing Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- 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
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Geology (AREA)
- Road Paving Structures (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the field of coal mine underground mining, in particular to a gob-side entry retaining method. According to the invention, a hole is drilled in a roadway in front of a coal face along a top plate pre-splitting line to the top plate at the upper part, an energy-gathering explosive charge is loaded in a certain range at the upper part of the hole, no explosive is loaded in a certain range at the lower part of the hole, the hole is filled with stemming, blasting is carried out before the working face is subjected to advanced pressure, the rock stratum at the explosive loading part at the upper part of the hole is blasted and pre-split, the rock stratum at the lower part is. After the working face is pushed, a rapid-hardening and high-strength concrete roadside supporting wall is built by adopting a pump concrete filling mold bag technology, a roadway lower part top plate which is not pre-cracked is cut off by the roadside supporting wall under the action of the pressure of a top plate, and the breaking position and the falling height of the top plate are controlled manually. The invention can promote the collapse of waste rock in the goaf, fill the goaf in time, and bear the pressure of the overlying roof by the waste rock in the goaf; the suspended ceiling length of the top plate in the goaf is reduced; thereby achieving the purpose of reducing the deformation and pressure of the gob-side entry retaining roadway.
Description
Technical Field
The invention relates to the field of coal mine underground mining, in particular to a gob-side entry retaining method.
Background
The gob-side entry retaining is an exploitation method for canceling a coal pillar protection entry during coal mine underground exploitation, and can cancel the coal pillar, reduce the excavation amount of the entry, improve the resource recovery rate, eliminate the stress concentration of the residual coal pillar on the upper coal seam, change the ventilation mode of a working face, reduce the gas accumulation of the working face and the like, so that the gob-side entry retaining has great technical advantages and economic significance.
The conventional method for retaining the gob-side entry is to construct a roadside support behind a hydraulic support, support a roadway top plate by the roadside support and cut down the top plate in the gob. However, under the condition of large mining height or large roof strength, the roadside support cannot cut the roof on the side of the goaf or only cut a part of the lower roof, so that the roof in the goaf falls insufficiently, the overhung roof is too large, and the old roof rotates and sinks. The old top is too large in suspended ceiling, the top plate pressure of the gob-side entry retaining is increased, the deformation of the gob-side entry retaining is increased due to the rotation and subsidence of the old top, the deformation of the gob-side entry retaining exceeds the allowable deformation of the roadside support, the roadside support is damaged, and the maintenance of the gob-side entry retaining is difficult or even fails.
Disclosure of Invention
And determining the pre-splitting line position of the top plate, blasting drilling parameters and charging parameters according to the roadway support, the top plate rock stratum condition and the rock caving coefficient. And constructing a blast hole and blasting before the advance pressure of the coal face. Constructing a pre-splitting drill hole along a pre-splitting line of a top plate, after the pre-splitting drill hole is finished, filling an energy-collecting explosive charge at a designed layer position, and detonating the blast hole after 1 blast hole is filled with explosive; or can be simultaneously filled into 3-5 holes and then detonated once. And cutting seams are formed in rock strata on two sides of the drill hole along the direction of the pre-splitting line after the drill hole is blasted, the cutting seams of the plurality of drill holes are connected into a pre-splitting line of the top plate, and a weakening surface is formed in the pre-splitting line in the top plate.
When the roadside support wall is constructed, the adjustment 1#Hydraulic support, 2#The space between the hydraulic supports is used as a construction space of the roadside support wall. The top plate of the construction space of the roadside support wall is supported by the single prop and the anchor net in a combined mode. The single support column is surrounded into 2 areas in the construction area of the roadside support wall, a filling mold bag is hung and fixed in the area I, and a single support column withdrawing channel is arranged in the area II. After the filling mould bags are hung and fixed, the stirred concrete is injected into the filling mould bags by a special concrete conveying pump for a coal mine, after the filling mould bags are fully filled and connected with the roof, the filling and stopping circulation is carried out for many times, so that the concrete in the filling mould bags is dehydrated, quickly solidified and early strengthened, the filling mould bags are fully connected with the roof, and a certain initial supporting force is formed for the roof. And the filling mold bag which finishes pouring concrete and the filling mold bag which is constructed before form a concrete roadside support wall along the edge of the gob. The gob-side entry retaining system is composed of a concrete roadside support wall, an original roadway and an original roadway support system.
Under the action of the pressure of the top plate covered on the pre-cracked top plate, the concrete roadside support wall breaks the top plate which is not pre-cracked at the lower part of the goaf side along the pre-cracking line, and rock strata at the pre-cracking part are also broken and fall. The caving waste rock is quickly filled in the goaf, most of the overlying strata pressure is borne by the waste rock in the goaf, and the support pressure of the gob-side entry retaining is reduced; the rotary sinking of the old top is avoided, and the deformation of the gob-side entry retaining is reduced.
The specific scheme of the invention is as follows:
and determining the position of the top plate pre-splitting line according to the width of the gob-side entry retaining and the width of the roadside support wall.
As a preferred mode: the top plate pre-splitting line is 0.2-0.5 m on the side of the gob of the roadside support wall.
Upper prefracture limit: the method is determined by a compaction caving coefficient and the properties of a roof rock stratum, so that the goaf can be filled with caving gangue outside the roadside support wall, the compaction caving coefficient is 1.1-1.15, and the mining height of the upper part of the roof is 7-10 times of the presplitting limit.
Lower pre-crack limit: the lower drilling hole is not filled with powder, so that the stability of the roadway is mainly guaranteed, the supporting structure of the roadway is not damaged, and the roadside supporting wall can cut off the lower rock stratum which is not pre-cracked.
Charging length: the part of the drilling hole between the upper pre-splitting limit and the lower pre-splitting limit is a charging pre-splitting blasting part, and the distance between the upper pre-splitting limit and the lower pre-splitting limit is the charging length.
And constructing a top plate pre-splitting hole along the top plate pre-splitting line 30-50 m in front of the working surface. Pre-crack parameters: the aperture phi is 40mm to 80mm, the interval is 1-3 m, the inclination angle is 70-80 degrees, and the hole depth reaches the designed upper presplitting limit.
And (3) loading energy-collecting explosive packages with designed length and explosive loading amount into the pre-cracked holes of the top plate, indexing the explosion guide out drill holes, and filling the rest drill holes with stemming.
After 1 drill hole is filled with the explosive, detonating the drill hole; or can be simultaneously filled into 3-5 holes and then detonated once.
And after the drilling blasting, cutting seams are formed on the two sides of the drill hole along the pre-splitting line.
And a plurality of blasting pre-splitting hole cutting seams are connected together to form a top plate pre-splitting line, and a weak surface is formed in a rock stratum at the deep part of the top plate.
After coal is cut by the coal mining machine, at 2#Nonmetal fiber nets are laid on the upper portions of construction spaces of the supports and the roadside support walls, the lapping length of the fiber nets and an original roadway top net is larger than 300mm, the width of the fiber nets is 6-8 m, and the fiber nets are fixed on a top plate through anchor rods.
3 rows of single pillars are supported in a construction space of the roadside support wall, the 1 st row of single pillars is the side edge of a roadway of the roadside support wall, the 2 nd row of single pillars is the side edge of a goaf of the roadside support wall, the row spacing is the width of the roadside support wall, the space of the 1 st row of single pillars and the 2 nd row of single pillars has the row spacing of 0.8-1.5 m and the pillar spacing of 0.6-1.0 m; the 3 rd row of single pillars are arranged on the side of the 2 nd row of pillar mined-out area, and the distance between the 3 rd row of single pillars and the 2 nd row of single pillars is 0.3-0.5 m, and the distance between the 3 rd row of single pillars and the column is 0.4-0.6 m.
With the advance of the working face, 3 rows of support columns extend forwards after the hydraulic support moves, 1 and 2 rows of single columns form a space for hanging and filling a mold bag, and 2 and 3 rows of single support columns form a support column withdrawing channel.
After the working face is pushed for 2-4 m, hanging a concrete filling mold bag, wherein the filling opening of the concrete filling mold bag faces to the roadway.
And (3) inserting anchor bars into anchor bar insertion openings of the concrete filling mold bags, sewing sealing cylinders outside the insertion openings, fastening the sealing cylinders by using binding belts, then adding arched trays and nuts at two ends of the anchor bars, screwing and fixing the nuts, and compressing the flexible sealing cylinders to ensure that the space between the flat steel belts at two sides of the filling mold bags is equal to the width of the roadside concrete support wall.
Fixing the flat steel belt on the support column by using iron wires to form the concrete filling mould bag.
And (3) injecting the prepared concrete into the filling mould bag from a filling opening of the filling mould bag by adopting a coal mine underground concrete conveying unit, and stopping the pump after the filling mould bag is filled with the concrete and is fully abutted.
Pumping the concrete for 1 time by the concrete delivery pump every 3-5 min, stopping the pump, enabling the pressure of a pump injection outlet to be 0.5-1.0 Mpa, and performing injection and stop circulation for 3-5 times to enable the excess water in the concrete in the filling mold bag to be extruded out from the filling mold bag, enabling the filling mold bag to be fully connected with the top, enabling the concrete to be quickly solidified, and forming a certain initial supporting force for the top plate.
After the initial setting time of the concrete is 6 hours, a manual pre-tightening wrench is adopted to pre-tighten the anchor bar nut, and the pre-tightening torque is 300 N.m.
And after the concrete filling mold bags are filled for 24 hours, withdrawing the 2 nd and 3 rd rows of single support columns from the support column withdrawing channels.
And the filling mold bag which finishes pouring concrete and the filling mold bag which is constructed before form a concrete roadside support wall along the edge of the gob.
Under the action of the pressure of the overlying strata, the roadside support wall cuts the lower roof of the goaf side along the roof pre-splitting line, and the rock stratum of the pre-splitting part is broken and falls off along with the fracture. And the caving gangue quickly fills the goaf and becomes the goaf gangue. Most of the overlying strata pressure is borne by the waste rocks in the goaf, so that the support pressure of the gob-side entry retaining is reduced; meanwhile, the rotary sinking of the old roof is avoided, and the deformation of the gob-side entry retaining is reduced.
The gob-side entry retaining system is composed of a concrete roadside support wall, an original roadway and an original roadway support system.
The invention has the beneficial effects that:
1. a gob-side entry retaining method for a pre-cracked top plate of an advanced deep hole can accurately control the top plate to be broken in a range of 0.3-0.5 m at the gob-side of a gob-side supporting wall, and prevent the phenomenon that the gob-side entry retaining is deformed too much and the gob-side supporting wall is damaged due to overlong suspended roof and rotary sinking of an old roof;
2. a gob-side entry retaining method for a pre-cracked top plate of an advanced deep hole can promote roof caving, so that caving gangue can fill a goaf in time, the pressure of the roof overlying the roadway can be transferred to the gangue in the goaf in time, and the gob-side entry retaining support pressure can be greatly reduced.
Drawings
FIG. 1 is a schematic view of a gob-side entry retaining plan
FIG. 2A part enlarged view
FIG. 3A-A section before charging
After charging of the section of fig. 4B-B
After blasting in section C-C of FIG. 5
FIG. 6D-D section after the top plate is cut off
FIG. 7E-E section
FIG. 8 Structure of the drilling charge
Wherein:
1-coal face; 2-working face hydraulic support; 3-a goaf; 4-original roadway; 5-pre-splitting a top plate and drilling; 6-coal wall; 7-roof pre-splitting line; 8-advance support single prop; 9-1#A hydraulic support; 10-hanging a filling mould bag space; 11-a single prop withdrawal channel; 12-concrete filling mould bags; 13-2#A hydraulic support; 14-roadside retaining walls; 15-lagging support single prop; 16, performing lane keeping; 17-roof cutting line; 18-a first row of individual pillars; 19-a second row of individual pillars; 20-a third row of individual pillars; 21-filling the filling opening of the mold bag; 22-concrete pumping pipe; 23-supporting the anchor rod; 24-pre-fractured formation upper boundary; 25-pre-fractured formation lower boundary; 26-upper rock stratum; 27-pre-fractured rock formation; 28-lower rock formation; 29-an explosive; 30-stemming; 31-caving gangue; 32-blasting cracks; 33-unfilled drilled hole; 34-charge drilling; 35-drilling after blasting; 36-leg line; 37-detonators; 38-a blasting cartridge; 39-detonating cord.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example one
And determining the position of the top plate pre-splitting line according to the width of the gob-side entry retaining and the width of the roadside support wall.
And constructing a top plate presplitting drill hole 5 along a top plate presplitting line 7 at 30-50 m in front of the coal face 1, wherein the diameter phi of the presplitting drill hole 5 is 40 mm-80 mm, the interval is 1-3 m, the inclination angle is 70-80 degrees, and the hole depth is 15-25 m.
Before the stress concentration area in front of the working face, the explosive 29 and the detonator 36 are loaded into the blasting cartridge 37, and the blasting cartridge 37 is externally coated from the bottom of the top plate pre-cracking hole 5 to the lower limit of the pre-cracking hole one by one, and the charging length is 5-12 m.
And tamping the stemming 30 in the rest part of the pre-cracked hole 5.
And immediately blasting after charging is completed, and forming a cutting seam 32 along the direction of the top plate pre-splitting line on rock layers on two sides of the drilled hole.
The rock cutting seams 32 formed after the plurality of pre-splitting holes 5 are blasted are connected together to form a top plate pre-splitting line.
After coal cutting, in 2#The non-metal fiber net is laid on the upper portion of the support 13 and the roadside support wall construction space, the lapping length of the fiber net and an original roadway top net is larger than 300mm, the width of the fiber net is 6-8 m, and the fiber net is fixed on a top plate through an anchor rod.
3 rows of single columns are erected in the construction space of the roadside support wall, and the row spacing between the 1 st row of single columns 18 and the 2 nd row of single column space 19 is 0.8-1.5 m; 0.3-0.5 m of the 2 nd row single-body support column 19 and the 3 rd row single-body support column 20.
As the working face advances, the hydraulic support 9 moves forwards, the 3 rows of single supports 18, 19 and 20 extend forwards, a space 10 for hanging and filling the mold bag is formed between the 1 st row of single supports 18 and the 2 nd row of single supports, and the 2 nd row of single supports 19 and the 3 rd row of single supports 20 form a support withdrawing channel 11.
After the space 10 for hanging the filling mold bag reaches 2-4 m, the concrete filling mold bag 12 is hung, and the filling opening 21 of the concrete filling mold bag faces the roadway 4.
Inserting anchor bars into anchor bar insertion openings of the concrete filling mold bags 12, sewing sealing cylinders outside the insertion openings, fastening the sealing cylinders by using binding belts, then adding arched trays and nuts at two ends of the steel bars, screwing and fixing the nuts, and pressing the flexible sealing cylinders tightly to enable the space between flat steel belts at two sides of the filling mold bags to be equal to the width of the roadside concrete support wall 14;
fixing the flat steel belt on the support column by using iron wire to form the mould bag
And (3) injecting the prepared concrete filling mold bag filling opening 21 into the filling mold bag 12 by adopting a coal mine underground concrete conveying unit, and stopping the pump after the filling mold bag is filled with concrete and is connected with the roof.
Pumping the concrete by the concrete delivery pump for 1 time every 3-5 minutes, stopping pumping, enabling the pressure of a pump injection outlet to be 0.5-1.0 Mpa, and performing injection and stop circulation for 3-5 times to ensure that the excessive water in the concrete in the filling mold bag 12 is extruded from the filling mold bag, the filling mold bag is fully connected with the top, the concrete is quickly solidified, and a certain initial supporting force is formed on the top plate.
After the initial setting time of the concrete is 6 hours, a manual pre-tightening wrench is adopted to apply pre-tightening force to the anchor bar nut, and the pre-tightening torque is 300 N.m.
After the concrete filling mold bag 12 is filled for 24 hours, the row 2 individual pillars 19 and the row 3 individual pillars 20 are withdrawn from the pillar withdrawing passage 11.
The filling mold bag 12 which finishes pouring concrete and the roadside support wall 14 which finishes the construction form a concrete roadside support wall 14 along the edge of the gob.
A gob-side entry retaining is formed by a concrete roadside support wall 14, an original roadway 4 and an original roadway support system.
Under the pressure action of the overlying strata 26 and 27, the roadside support wall 14 cuts the lower part top plate 28 at the goaf side along the top plate pre-splitting line 7, the strata 27 fall together to form falling waste rock 31, the falling waste rock 31 quickly fills the goaf, most of the pressure above the overlying strata 26 is borne by the goaf waste rock 31, and the pressure of the gob-side entry retaining 16 and the roadside support 14 is reduced; meanwhile, the rotary sinking of the old roof is avoided, and the deformation of the gob-side entry retaining is reduced.
Claims (5)
1. A gob-side entry retaining method for a pre-cracked top plate of an advanced deep hole is characterized by comprising the following steps: drilling along a top plate pre-splitting line in front of a coal face and performing deep hole directional blasting, wherein the drilling blasting forms a cutting seam in a rock stratum and forms a weakening face at the position of the pre-splitting line in the top plate; after the working face is pushed, constructing a concrete roadside supporting wall, cutting down a top plate along the vicinity of a top plate pre-splitting line by the roadside supporting wall, and bearing most of the pressure of the top plate along a gob-side entry retaining by falling goaf waste rocks;
the cutting seams formed after the pre-splitting holes are blasted form weak surfaces of the top plate, and the weak surfaces are deep in the rock layer of the top plate; the top plate pre-splitting line is a straight line formed by connecting top plate pre-splitting holes and is 0.2-0.5 m outside the roadside support wall, and the position of the top plate pre-splitting line is a goaf side top plate breaking position;
and the roadside support wall cuts off the rock stratum at the lower part of the top plate, and the deep blasting rock stratum is broken and falls along with the cutting, so as to form falling waste rock in the goaf.
2. The gob-side entry retaining method for the advanced deep-hole pre-cracked roof plate according to claim 1, characterized in that: the effect of roof presplitting drilling blasting lancing on the roof presplitting line is that the deep weakens the roof, rather than directly cutting off the roof.
3. The gob-side entry retaining method for the advanced deep-hole pre-cracked roof plate according to claim 1, characterized in that: the top plate pre-cracking hole is blasted before the working face advances pressure, the top plate pre-cracking hole is constructed 30-50 m ahead of the working face, and the top plate is blasted 20-45 m.
4. The gob-side entry retaining method for the advanced deep-hole pre-cracked roof plate according to claim 1, characterized in that: the roof hanging and the rotary sinking of the roof can be reduced after the roof on the side of the mining area is cut off; the caving gangue plays a supporting role for the overlying roof.
5. The gob-side entry retaining method for the advanced deep-hole pre-cracked roof plate according to claim 1, characterized in that: the diameter phi of the top plate pre-splitting holes forming the top plate pre-splitting line ranges from 40mm to 80mm, the distance ranges from 1m to 3m, and the inclination angle ranges from 70 degrees to 80 degrees.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810151194.3A CN108457653B (en) | 2018-02-22 | 2018-02-22 | Gob-side entry retaining method for pre-cracked top plate of advanced deep hole |
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| CN201810151194.3A CN108457653B (en) | 2018-02-22 | 2018-02-22 | Gob-side entry retaining method for pre-cracked top plate of advanced deep hole |
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| CN108457653B true CN108457653B (en) | 2021-01-26 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109723440A (en) * | 2019-01-24 | 2019-05-07 | 太原理工大学 | A kind of method of selective cleavage top plate in double return channel connection roadways |
| CN109854246B (en) * | 2019-01-24 | 2020-11-17 | 太原理工大学 | Method for realizing fixed-point roof fracture in double-withdrawal-channel connection lane |
| CN109707442B (en) * | 2019-03-08 | 2023-09-12 | 中煤科工集团北京华宇工程有限公司 | Goaf rapid grouting filling bag synchronous with coal cutting and coal mining method thereof |
| CN109882172B (en) * | 2019-04-08 | 2020-07-07 | 山东科技大学 | Gob-side entry retaining method by using cut-off direct roof as roadside support wall |
| CN110173264B (en) * | 2019-06-13 | 2021-04-27 | 山东科技大学 | Method for preventing and treating hard roof roadway rock burst through roof breakage and conventional pressure relief |
| CN111364995B (en) * | 2020-03-26 | 2021-02-12 | 中国矿业大学(北京) | Construction method of fully mechanized caving coal roadway stable roof-coal pillar structure |
| CN112196532A (en) * | 2020-09-29 | 2021-01-08 | 安徽理工大学 | Method for reducing stress of coal pillar by pre-splitting roof rock stratum through large-diameter deep-hole spherical explosive package |
| CN113309520A (en) * | 2021-07-14 | 2021-08-27 | 辽宁工程技术大学 | Reconstructed surrounding rock for advanced pre-splitting roof cutting gob-side entry retaining and construction method |
| CN113417640B (en) * | 2021-08-10 | 2023-01-03 | 湖南科技大学 | Gob-side entry retaining supporting method in reserved extremely-close thin coal seam separate mining-combined mining |
| CN114542069B (en) * | 2022-02-28 | 2023-02-24 | 安徽理工大学 | Upper-breaking and lower-cutting gob-side entry retaining blasting method for huge-thickness top plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104763425B (en) * | 2015-02-03 | 2017-01-25 | 杨洪兴 | Pressure relief presplitting blasting gob-side entry retaining pillar-free mining method |
| CN104790954A (en) * | 2015-03-27 | 2015-07-22 | 黑龙江科技大学 | Roadside packing gob-side entry retaining top-cutting explosion pressure relief method |
| CN104806246B (en) * | 2015-05-08 | 2017-02-01 | 贵州盘江精煤股份有限公司 | Gob-side entry retaining method for coal mine gateway by directional-predetermined crack blasting and truncating crest and pressure relief mode |
| CN107191187B (en) * | 2017-07-07 | 2019-11-05 | 中国中煤能源集团有限公司 | A kind of gob side entry retaining cuts top pressure relief method |
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