CN116877132A - Method for grouting and filling coal gangue slurry in roadside grouting pouring wall and goaf - Google Patents
Method for grouting and filling coal gangue slurry in roadside grouting pouring wall and goaf Download PDFInfo
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- CN116877132A CN116877132A CN202310806792.0A CN202310806792A CN116877132A CN 116877132 A CN116877132 A CN 116877132A CN 202310806792 A CN202310806792 A CN 202310806792A CN 116877132 A CN116877132 A CN 116877132A
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- filling
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- slurry
- wall
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- 239000002002 slurry Substances 0.000 title claims abstract description 119
- 239000003245 coal Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000003756 stirring Methods 0.000 claims abstract description 44
- 239000004568 cement Substances 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 238000005065 mining Methods 0.000 claims abstract description 21
- 239000011268 mixed slurry Substances 0.000 claims abstract description 13
- 238000005516 engineering process Methods 0.000 claims abstract description 9
- 238000005086 pumping Methods 0.000 claims description 31
- 238000005266 casting Methods 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000005520 cutting process Methods 0.000 claims description 12
- 238000004537 pulping Methods 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 241000555745 Sciuridae Species 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000002910 solid waste Substances 0.000 abstract description 5
- 238000011065 in-situ storage Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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 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
- E21F15/08—Filling-up hydraulically or pneumatically
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21F15/08—Filling-up hydraulically or pneumatically
- E21F15/10—Hydraulic or pneumatic filling-up machines
-
- 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
Abstract
The invention discloses a method for grouting and filling a wall by roadside grouting and a goaf grouting by using gangue slurry. The two sets of units share a large-volume buffer tank, and the self-priming double-liquid grouting pump matched with the grouting wall-pouring machine set sucks the gangue slurry from the large-volume buffer tank through a suction pipe in one pass, sucks the cement slurry from a stirring tank through the suction pipe in the other pass, and the sucked slurry from the suction pipe in two passes is injected into a template which is arranged close to the rear end of the fully mechanized mining face through a mixed slurry conveying pipe in one pass to form a roadside filling wall. And after the filling pump of the tail end grouting filling unit self-sucks or receives the gangue slurry of the large-volume buffer tank, grouting and filling the goaf through the pre-buried grouting pipe and the grouting holes on the gob-side entry retaining roof. The invention effectively combines the gob-side entry retaining and goaf grouting filling technologies, not only can improve the recovery resource rate of coal, but also can treat solid waste in situ, and reduces ecological pollution.
Description
Technical Field
The invention belongs to the technical field of filling and mining of underground coal mines, and particularly relates to a method for grouting and filling coal gangue slurry into a roadside grouting pouring wall and a goaf.
Background
With the enhancement of social environmental protection consciousness, environmental standards and related requirements of mining area development process are becoming stricter, and underground filling exploitation of coal gangue solid waste has become an important direction of safety, green and sustainable development. The technology of mining and grouting the gangue powder slurry body is characterized by no influence on production, low investment and more remarkable advantages in the aspect of disposing the gangue solid waste. Meanwhile, the gob-side entry retaining technology has incomparable advantages in the aspects of reducing coal resource loss, reducing spontaneous combustion of residual coal in a goaf, relieving mining and succession tension of a mine, improving economic benefit and the like. Both techniques currently have independent system equipment arrangements and construction processes. For a large mining height fully-mechanized mining face, the height of the gate way is large, the pressure is large, the width of the gob-side entry retaining roadside wall body is large, the wall building material amount is large, and the transportation amount is also large. The coal gangue slurry filling injects the slurry prepared on the ground or underground into the goaf, so that the conveying capacity is high, and the occupied space of the conveying pipe is small. Meanwhile, the outside of the traditional gob-side entry retaining wall body is a caving rock block, so that the porosity is large, the supporting strength is low, and the gob-side entry retaining pressure is large. In order to reduce the material consumption of a pouring wall, reasonably dispose coal gangue and reduce gob-side entry retaining pressure or impact risk, a method for pouring a roadside wall and goaf grouting filling by fusing gob-side entry retaining is required to be developed.
Disclosure of Invention
The invention aims to provide a method for grouting and pouring wall beside a roadway and grouting and filling a goaf by using coal gangue slurry, which can improve the recovery rate of coal resources, treat solid waste in situ to reduce ecological pollution, reduce gob-side entry retaining pressure and is particularly suitable for rock burst mines.
The technical scheme adopted by the invention is that the method for grouting and filling the wall and the goaf by using the gangue slurry is characterized by comprising the following steps:
step 1, system arrangement;
step 2, grouting equipment arrangement;
and 3, construction procedure.
The present invention is also characterized in that,
the step 1 is specifically implemented according to the following steps:
a large system for goaf grouting filling is arranged on the ground or a downhole chamber, and comprises a gangue crushing, pulping and pumping system;
two adjacent fully-mechanized mining working surfaces, namely the working surface and the adjacent working surface, are arranged at one time to form a two-sided three-lane arrangement mode, wherein three lanes are an upper cis-forming groove, a middle cis-forming groove and a lower cis-forming groove respectively, and the middle cis-forming groove arranged in the middle of the three lanes adopts a gob-side entry retaining technology with walls beside a lane.
The crushing system adopts secondary crushing, the primary crushing adopts a double-toothed roller crusher, the secondary crushing adopts a squirrel cage crusher, the pulping system adopts two horizontal double-shaft agitators which are arranged in a high-low lap joint mode, and the pumping system adopts one industrial filling pump and two industrial filling pumps.
The step 2 is specifically as follows:
arranging a tail end grouting filling unit at a cutting hole of an adjacent working face, wherein the tail end grouting filling unit consists of 1 filling pump and 1-2 large-capacity buffer tanks, and a ground or underground pumping system is connected with the large-capacity buffer tanks through a primary pumping pipeline for slurry conveying;
a small system for roadside grouting wall casting machine set, namely a grouting wall casting machine set, is arranged at the cutting hole of the adjacent working face, and the grouting wall casting machine set consists of 1 self-priming double-liquid grouting pump and 1-2 stirring tanks, wherein the self-priming double-liquid grouting pump is provided with two self-priming pipes and a slurry conveying pipe;
one self-priming pipe of the self-priming double-liquid grouting pump is connected with a large-volume buffer tank, the other self-priming pipe is connected with a stirring tank, two slurry conveying pipes are fused into one mixed slurry conveying pipe through a tee joint, and the tail end of the mixed slurry conveying pipe is connected with a roadside pouring wall template;
the filling pump of the terminal grouting filling unit is connected with the goaf grouting holes arranged along the gob-side entry retaining roof through terminal grouting filling pipelines.
The roadside pouring wall template is a filling bag, a fiber cloth flexible template or a rigid template.
The gangue slurry is formed by mixing gangue powder with the particle size smaller than 3mm with water, and the mass concentration of solids is 60% -80%.
The grouting wall-pouring machine set is provided with an automatic cement bale breaker and is connected with the stirring tank.
The inside (mixing) shaft that is equipped with of big volume buffer tank is equipped with the stirring vane on the (mixing) shaft.
The embedded grouting pipe horizontally penetrates through the roadside filling wall body and is communicated with the goaf, the diameter of the embedded grouting pipe is 100-300 mm, grouting holes of the goaf are inclined drilling holes, the tops of the grouting holes of the goaf face the goaf and are communicated with the goaf, an included angle between the grouting holes of the embedded grouting pipe and a vertical line is 10-45 degrees, and coal gangue grouting filling is carried out 20-80 m behind a lagging working face of the grouting holes of the embedded grouting pipe and the goaf.
The step 3 is specifically as follows:
outside the 50m range of the advanced working face, constructing a tilt goaf grouting hole on a top plate close to the goaf side in advance, grouting Kong Qingxiang the working face, and enabling the grouting hole to be communicated with the goaf after stoping;
the working face is mined back to form a roadside pouring wall space and a goaf grouting filling space;
a roadside pouring wall template is supported at the side of a goaf behind a hydraulic support in the middle gateway;
the large system for goaf grouting filling is operated, coal gangue is crushed, water is added and stirred to prepare coal gangue slurry, and then the coal gangue slurry is conveyed into a large-volume buffer tank positioned in a cutting hole through a main pipeline of an industrial filling pump by a primary pumping pipeline;
running a small system for roadside grouting and wall casting, adding cement and water into a stirring tank, stirring to prepare cement slurry, sucking the gangue slurry from a large-volume slurry tank through a suction pipe by one time of a self-suction double-liquid grouting pump, sucking the cement slurry from the stirring tank through the suction pipe by the other time, outputting the sucked slurry from the suction pipe by two times of slurry conveying pipes, and injecting the slurry into a roadside wall casting template which is arranged close to the rear of a hydraulic support of a fully mechanized mining face through a mixed slurry conveying pipe after fusion to form a roadside filling wall;
after a filling pump of the tail end grouting filling unit self-sucks or receives the gangue slurry of the large-volume buffer tank, the gangue slurry is injected into a goaf through a tail end grouting filling pipeline by utilizing a pumping pressure through a pre-buried grouting pipe on a rear roadside filling wall and goaf grouting holes arranged on a gob-side entry retaining roof, so that goaf grouting filling is realized.
The invention has the beneficial effects that the method for grouting and pouring the wall at the roadside and grouting and filling the goaf by using the gangue slurry reduces the materials for constructing the wall and the transportation pressure of the gangue slurry at the gob-side entry retaining, and the occupied space of the conveying pipe is small, so that the normal use of the roadway is not influenced. Meanwhile, goaf pores are filled to a certain extent after the slurry is filled, the overall supporting strength is improved, and the gob-side entry retaining pressure or impact risk is reduced. The two technologies are effectively combined, the equipment is arranged linearly, normal production of a mine is not affected, the recovery resource rate of coal can be safely and efficiently improved, solid waste can be treated in situ, and ecological pollution is reduced.
Drawings
FIG. 1 is a plan view of a coal gangue slurry for roadside grouting wall casting and goaf grouting filling;
FIG. 2 is a layout of a grouting and filling system of coal gangue slurry for roadside grouting and wall casting and goaf grouting and filling;
FIG. 3 is an elevation view of grouting drilling of a wall-poured embedded pipe and a goaf.
In the figure, 1. A terminal grouting filling unit; 1-1, a filling pump; 1-2, a large-capacity cache tank; 2. grouting wall-casting machine set; 2-1, a self-priming double-liquid grouting pump; 2-2, stirring the tank; 3. a main pumping pipe; 4. self-sucking pipe; 5. a slurry conveying pipe; 6. a mixed slurry delivery pipe; 7. a working face hydraulic support; 8. a roadside filling wall; 9. a tail end grouting filling pipeline; 10. pre-burying a grouting pipe; 11. grouting holes; 12. pouring templates beside a roadway; 13. goaf coal gangue slurry.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention discloses a method for grouting and filling a wall and a goaf by roadside grouting by using gangue slurry, which is implemented according to the following steps:
step 1, system arrangement;
referring to fig. 1, step 1 is specifically implemented as follows:
a large system for goaf grouting filling is arranged on the ground or a downhole chamber, and comprises a gangue crushing, pulping and pumping system;
two adjacent fully-mechanized mining working surfaces, namely the working surface and the adjacent working surface, are arranged at one time to form a two-sided three-lane arrangement mode, wherein three lanes are an upper cis-forming groove, a middle cis-forming groove and a lower cis-forming groove respectively, and the middle cis-forming groove arranged in the middle of the three lanes adopts a gob-side entry retaining technology with walls beside a lane.
The crushing system adopts secondary crushing, the primary crushing adopts a double-toothed roller crusher, the secondary crushing adopts a squirrel cage crusher, the pulping system adopts two horizontal double-shaft agitators which are arranged in a high-low lap joint mode, and the pumping system adopts one industrial filling pump and two industrial filling pumps.
Step 2, grouting equipment arrangement;
referring to fig. 2 and 3, step 2 is specifically as follows:
arranging a tail end grouting filling unit 1 on a cutting hole of an adjacent working face, wherein the tail end grouting filling unit 1 consists of 1 filling pump 1-1 and 1-2 large-capacity buffer tanks 1-2, and a ground or underground pumping system is connected with the large-capacity buffer tanks 1-2 through a pumping main pipeline 3 for slurry conveying;
a small system for roadside grouting wall casting, namely a grouting wall casting machine set 2 is arranged at the cutting hole of the adjacent working face, the grouting wall casting machine set 2 consists of 1 self-priming double-liquid grouting pump 2-1 and 1-2 stirring tanks 2-2, and the self-priming double-liquid grouting pump 2-1 is provided with two self-priming pipes 4 and a slurry conveying pipe 5;
the self-priming double-liquid grouting pump 2-1 is characterized in that a self-priming pipe 4 of one pass is connected with a large-volume buffer tank 1-2, a self-priming pipe 4 of the other pass is connected with a stirring tank 2-2, a slurry conveying pipe 5 of two passes is fused into a slurry conveying pipe 6 of one pass through a tee joint, and the tail end of the slurry conveying pipe 6 is connected with a roadside pouring wall template 13;
the filling pump 1-1 of the end grouting filling unit 1 is connected with a goaf grouting hole 11 arranged along the goaf roof by an end grouting filling pipeline 9.
The roadside pouring wall templates 12 are filling bags, fiber cloth flexible templates or rigid templates.
The gangue slurry is formed by mixing gangue powder with the particle size smaller than 3mm with water, and the mass concentration of solids is 60% -80%.
The grouting wall-pouring machine set 2 is additionally provided with an automatic cement unpacking machine and is connected with the stirring tank 2-2, so that the unpacking labor intensity of workers is reduced.
The inside of the large-volume buffer tank 1-2 is provided with a stirring shaft which is vertically arranged, and stirring blades are arranged on the stirring shaft to prevent slurry from precipitating.
The embedded grouting pipe 10 horizontally penetrates through the roadside filling wall body 8 and is communicated with the goaf, the diameter of the embedded grouting pipe 10 is 100-300 mm, the goaf grouting hole 11 is an inclined drilling hole, the top of the goaf grouting hole 11 faces the goaf and is communicated with the goaf, the included angle between the top of the goaf grouting hole 11 and a vertical line is 10-45 degrees, and the embedded grouting pipe 10 and the goaf grouting hole 11 lag behind a working face by 20-80 m to carry out gangue grouting filling.
And 3, construction procedure.
The step 3 is specifically as follows:
outside the 50m range of the advanced working surface, constructing a tilt goaf grouting hole 11 on a top plate close to the goaf side in advance, wherein the grouting hole 11 is inclined to the working surface, and the grouting hole 11 is communicated with the goaf after stoping;
the working face is mined back to form a roadside pouring wall space and a goaf grouting filling space;
a roadside pouring wall template 12 is supported at the side of a goaf behind the hydraulic support 7 in the middle gateway;
the large system for goaf grouting filling is operated, coal gangue is crushed, water is added and stirred to prepare coal gangue slurry, and then the coal gangue slurry is conveyed into a large-volume buffer tank 1-2 positioned in a cut hole through a main pipeline 3 of one-pass pumping through an industrial filling pump;
operating a small system for roadside grouting and wall casting, adding cement and water into a stirring tank 2-2, stirring to prepare cement slurry, sucking gangue slurry from a large-volume slurry tank 1-2 by a self-suction pipe 4 of a self-suction double-liquid grouting pump 2-1, sucking the cement slurry from the stirring tank 2-2 by the self-suction pipe 4 of the other self-suction pipe, outputting the sucked slurry of the suction pipe 4 of the two self-suction pipe through a two-suction slurry conveying pipe 5, and injecting the slurry into a roadside grouting wall template 12 which is arranged closely behind a fully-mechanized mining face hydraulic support 7 through a one-suction mixed slurry conveying pipe 6 after fusion to form a roadside filling wall 8;
after the filling pump of the end grouting filling unit 1 self-sucks or receives the gangue slurry of the large-volume buffer tank 1-2, the gangue slurry is injected into a goaf through the pre-buried grouting pipe 10 on the rear roadside filling wall 8 and the goaf grouting holes 11 arranged on the gob-side entry retaining roof by utilizing the pumping pressure through the end grouting filling pipeline 9, so that goaf grouting filling is realized.
Example 1
The invention discloses a method for grouting and filling a wall and a goaf by roadside grouting by using gangue slurry, which is implemented according to the following steps:
step 1, system arrangement;
referring to fig. 1, step 1 is specifically implemented as follows:
a large system for goaf grouting filling is arranged on the ground or a downhole chamber, and comprises a gangue crushing, pulping and pumping system;
two adjacent fully-mechanized mining working surfaces, namely the working surface and the adjacent working surface, are arranged at one time to form a two-sided three-lane arrangement mode, wherein three lanes are an upper cis-forming groove, a middle cis-forming groove and a lower cis-forming groove respectively, and the middle cis-forming groove arranged in the middle of the three lanes adopts a gob-side entry retaining technology with walls beside a lane.
The crushing system adopts secondary crushing, the primary crushing adopts a double-toothed roller crusher, the secondary crushing adopts a squirrel cage crusher, the pulping system adopts two horizontal double-shaft agitators which are arranged in a high-low lap joint mode, and the pumping system adopts one industrial filling pump and two industrial filling pumps.
Step 2, grouting equipment arrangement;
referring to fig. 2 and 3, step 2 is specifically as follows:
arranging a tail end grouting filling unit 1 on a cutting hole of an adjacent working face, wherein the tail end grouting filling unit 1 consists of 1 filling pump 1-1 and 1-2 large-capacity buffer tanks 1-2, and a ground or underground pumping system is connected with the large-capacity buffer tanks 1-2 through a pumping main pipeline 3 for slurry conveying;
a small system for roadside grouting wall casting, namely a grouting wall casting machine set 2 is arranged at the cutting hole of the adjacent working face, the grouting wall casting machine set 2 consists of 1 self-priming double-liquid grouting pump 2-1 and 1-2 stirring tanks 2-2, and the self-priming double-liquid grouting pump 2-1 is provided with two self-priming pipes 4 and a slurry conveying pipe 5;
the self-priming double-liquid grouting pump 2-1 is characterized in that a self-priming pipe 4 of one pass is connected with a large-volume buffer tank 1-2, a self-priming pipe 4 of the other pass is connected with a stirring tank 2-2, a slurry conveying pipe 5 of two passes is fused into a slurry conveying pipe 6 of one pass through a tee joint, and the tail end of the slurry conveying pipe 6 is connected with a roadside pouring wall template 13;
the filling pump 1-1 of the end grouting filling unit 1 is connected with a goaf grouting hole 11 arranged along the goaf roof by an end grouting filling pipeline 9.
The inside of the large-volume buffer tank 1-2 is provided with a stirring shaft which is vertically arranged, and stirring blades are arranged on the stirring shaft to prevent slurry from precipitating.
The embedded grouting pipe 10 horizontally penetrates through the roadside filling wall body 8 and is communicated with the goaf, the diameter of the embedded grouting pipe 10 is 100-300 mm, the goaf grouting hole 11 is an inclined drilling hole, the top of the goaf grouting hole 11 faces the goaf and is communicated with the goaf, the included angle between the top of the goaf grouting hole 11 and a vertical line is 10-45 degrees, and the embedded grouting pipe 10 and the goaf grouting hole 11 lag behind a working face by 20-80 m to carry out gangue grouting filling.
And 3, construction procedure.
The step 3 is specifically as follows:
outside the 50m range of the advanced working surface, constructing a tilt goaf grouting hole 11 on a top plate close to the goaf side in advance, wherein the grouting hole 11 is inclined to the working surface, and the grouting hole 11 is communicated with the goaf after stoping;
the working face is mined back to form a roadside pouring wall space and a goaf grouting filling space;
a roadside pouring wall template 12 is supported at the side of a goaf behind the hydraulic support 7 in the middle gateway;
the large system for goaf grouting filling is operated, coal gangue is crushed, water is added and stirred to prepare coal gangue slurry, and then the coal gangue slurry is conveyed into a large-volume buffer tank 1-2 positioned in a cut hole through a main pipeline 3 of one-pass pumping through an industrial filling pump;
operating a small system for roadside grouting and wall casting, adding cement and water into a stirring tank 2-2, stirring to prepare cement slurry, sucking gangue slurry from a large-volume slurry tank 1-2 by a self-suction pipe 4 of a self-suction double-liquid grouting pump 2-1, sucking the cement slurry from the stirring tank 2-2 by the self-suction pipe 4 of the other self-suction pipe, outputting the sucked slurry of the suction pipe 4 of the two self-suction pipe through a two-suction slurry conveying pipe 5, and injecting the slurry into a roadside grouting wall template 12 which is arranged closely behind a fully-mechanized mining face hydraulic support 7 through a one-suction mixed slurry conveying pipe 6 after fusion to form a roadside filling wall 8;
after the filling pump of the end grouting filling unit 1 self-sucks or receives the gangue slurry of the large-volume buffer tank 1-2, the gangue slurry is injected into a goaf through the pre-buried grouting pipe 10 on the rear roadside filling wall 8 and the goaf grouting holes 11 arranged on the gob-side entry retaining roof by utilizing the pumping pressure through the end grouting filling pipeline 9, so that goaf grouting filling is realized.
Example 2
The invention discloses a method for grouting and filling a wall and a goaf by roadside grouting by using gangue slurry, which is implemented according to the following steps:
step 1, system arrangement;
referring to fig. 1, step 1 is specifically implemented as follows:
a large system for goaf grouting filling is arranged on the ground or a downhole chamber, and comprises a gangue crushing, pulping and pumping system;
two adjacent fully-mechanized mining working surfaces, namely the working surface and the adjacent working surface, are arranged at one time to form a two-sided three-lane arrangement mode, wherein three lanes are an upper cis-forming groove, a middle cis-forming groove and a lower cis-forming groove respectively, and the middle cis-forming groove arranged in the middle of the three lanes adopts a gob-side entry retaining technology with walls beside a lane.
Step 2, grouting equipment arrangement;
referring to fig. 2 and 3, step 2 is specifically as follows:
arranging a tail end grouting filling unit 1 on a cutting hole of an adjacent working face, wherein the tail end grouting filling unit 1 consists of 1 filling pump 1-1 and 1-2 large-capacity buffer tanks 1-2, and a ground or underground pumping system is connected with the large-capacity buffer tanks 1-2 through a pumping main pipeline 3 for slurry conveying;
a small system for roadside grouting wall casting, namely a grouting wall casting machine set 2 is arranged at the cutting hole of the adjacent working face, the grouting wall casting machine set 2 consists of 1 self-priming double-liquid grouting pump 2-1 and 1-2 stirring tanks 2-2, and the self-priming double-liquid grouting pump 2-1 is provided with two self-priming pipes 4 and a slurry conveying pipe 5;
the self-priming double-liquid grouting pump 2-1 is characterized in that a self-priming pipe 4 of one pass is connected with a large-volume buffer tank 1-2, a self-priming pipe 4 of the other pass is connected with a stirring tank 2-2, a slurry conveying pipe 5 of two passes is fused into a slurry conveying pipe 6 of one pass through a tee joint, and the tail end of the slurry conveying pipe 6 is connected with a roadside pouring wall template 13;
the filling pump 1-1 of the end grouting filling unit 1 is connected with a goaf grouting hole 11 arranged along the goaf roof by an end grouting filling pipeline 9.
The roadside pouring wall templates 12 are filling bags, fiber cloth flexible templates or rigid templates.
The gangue slurry is formed by mixing gangue powder with the particle size smaller than 3mm with water, and the mass concentration of solids is 60% -80%.
The grouting wall-pouring machine set 2 is additionally provided with an automatic cement unpacking machine and is connected with the stirring tank 2-2, so that the unpacking labor intensity of workers is reduced.
And 3, construction procedure.
The step 3 is specifically as follows:
outside the 50m range of the advanced working surface, constructing a tilt goaf grouting hole 11 on a top plate close to the goaf side in advance, wherein the grouting hole 11 is inclined to the working surface, and the grouting hole 11 is communicated with the goaf after stoping;
the working face is mined back to form a roadside pouring wall space and a goaf grouting filling space;
a roadside pouring wall template 12 is supported at the side of a goaf behind the hydraulic support 7 in the middle gateway;
the large system for goaf grouting filling is operated, coal gangue is crushed, water is added and stirred to prepare coal gangue slurry, and then the coal gangue slurry is conveyed into a large-volume buffer tank 1-2 positioned in a cut hole through a main pipeline 3 of one-pass pumping through an industrial filling pump;
operating a small system for roadside grouting and wall casting, adding cement and water into a stirring tank 2-2, stirring to prepare cement slurry, sucking gangue slurry from a large-volume slurry tank 1-2 by a self-suction pipe 4 of a self-suction double-liquid grouting pump 2-1, sucking the cement slurry from the stirring tank 2-2 by the self-suction pipe 4 of the other self-suction pipe, outputting the sucked slurry of the suction pipe 4 of the two self-suction pipe through a two-suction slurry conveying pipe 5, and injecting the slurry into a roadside grouting wall template 12 which is arranged closely behind a fully-mechanized mining face hydraulic support 7 through a one-suction mixed slurry conveying pipe 6 after fusion to form a roadside filling wall 8;
after the filling pump of the end grouting filling unit 1 self-sucks or receives the gangue slurry of the large-volume buffer tank 1-2, the gangue slurry is injected into a goaf through the pre-buried grouting pipe 10 on the rear roadside filling wall 8 and the goaf grouting holes 11 arranged on the gob-side entry retaining roof by utilizing the pumping pressure through the end grouting filling pipeline 9, so that goaf grouting filling is realized.
Example 3
The coal mine is located at about 30km in northwest of elm in the ocean, the No. 2 coal seam is mainly adopted, the mining height is 6.1m, and the mine burial depth is 550-650 m. Two adjacent fully-mechanized coal mining working faces are arranged at one time, namely a gob-side entry retaining working face and an adjacent working face, a two-face three-lane arrangement form is formed, three lanes are an upper gate, a middle gate and a lower gate, a cement gangue base filling wall is poured into the middle gate arranged in the middle of the three lanes through the adhesive tape gate to serve as a roadside support of the gob-side entry retaining, grouting pipes are pre-buried on a top plate grouting hole and a wall body, and coal gangue grouting filling is performed on a lagging working face.
As shown in fig. 1, 2 and 3, the following embodiments are provided:
1) Linearly arranging a tail end grouting filling unit 1 and a grouting wall casting unit 2 on the cutting holes of the adjacent fully-mechanized mining face;
2) Outside the 50m range of the advanced working surface, constructing an inclined grouting hole 11 on a side top plate close to the goaf in advance, wherein the grouting hole 11 is inclined to the working surface, and the grouting hole is communicated with the goaf after stoping;
3) The working face is mined back to form a roadside pouring wall space and a goaf grouting filling space;
4) A roadside pouring wall template 12 is supported at the side of the goaf behind the working face hydraulic support 7 in the middle gate way;
5) The large system for goaf grouting filling is operated, the secondary crushing of the gangue is carried out, water is added and stirred to prepare gangue slurry, and then the gangue slurry is conveyed to the large-volume buffer tank 1-2 positioned in a cut hole through the main pipeline 3 of one-pass pumping through an industrial filling pump;
6) Running a small system for roadside grouting pouring wall, adding cement and water into a stirring tank 2-2, stirring to prepare cement slurry, sucking gangue slurry from a large-volume grouting tank 1-2 by a self-suction pipe 4 of a self-suction double-liquid grouting pump 2-1, sucking cement slurry from the stirring tank 2-2 by a self-suction pipe 4 of the other self-suction pipe, regulating the proportion according to design, outputting the sucked slurry from a suction pipe 4 of the two times through a two-time slurry conveying pipe 5, and injecting the slurry into a template which is arranged close to the rear end of a fully mechanized mining face through a mixed slurry conveying pipe 6 after fusion to form a roadside filling wall 12;
7) The rear part of the lagging working face is 45m, the filling pump 1-1 of the end grouting filling unit 1 is used for self-sucking or receiving the gangue slurry of the large-volume buffer tank 1-2, the gangue slurry is injected into a goaf through the end grouting filling pipeline 9 through the pre-buried grouting pipe 10 on the rear roadside filling wall 8 and the grouting holes 11 on the gob-side entry retaining roof by utilizing the pumping pressure, and the goaf slurry 13 is diffused in the gap, so that goaf grouting filling is realized.
Claims (10)
1. The method for grouting and filling the coal gangue slurry into the roadside grouting pouring wall and the goaf is characterized by comprising the following steps of:
step 1, system arrangement;
step 2, grouting equipment arrangement;
and 3, construction procedure.
2. The method for grouting wall and goaf filling by coal gangue slurry according to claim 1, wherein the step 1 is specifically implemented according to the following steps:
a large system for goaf grouting filling is arranged on the ground or a downhole chamber, and comprises a gangue crushing, pulping and pumping system;
two adjacent fully-mechanized mining working surfaces, namely the working surface and the adjacent working surface, are arranged at one time to form a two-sided three-lane arrangement mode, wherein three lanes are an upper cis-forming groove, a middle cis-forming groove and a lower cis-forming groove respectively, and the middle cis-forming groove arranged in the middle of the three lanes adopts a gob-side entry retaining technology with walls beside a lane.
3. The method for grouting and pouring wall and goaf grouting and filling by coal gangue slurry according to claim 2, wherein the crushing system adopts secondary crushing, the primary crushing adopts a double-toothed roller crusher, the secondary crushing adopts a squirrel cage crusher, the pulping system adopts two horizontal double-shaft mixers arranged in a lap joint mode, and the pumping system adopts one industrial filling pump and two industrial filling pumps.
4. The method for filling the roadside grouting pouring wall and the goaf grouting according to claim 3, wherein the step 2 is specifically as follows:
arranging a tail end grouting filling unit (1) at a cutting hole of an adjacent working face, wherein the tail end grouting filling unit (1) consists of 1 filling pump (1-1) and 1-2 large-capacity buffer tanks (1-2), and a ground or underground pumping system is connected with the large-capacity buffer tanks (1-2) through a pumping main pipeline (3) for slurry conveying;
a small system, namely a grouting wall casting machine set (2), for grouting wall casting beside a roadway is arranged at a cutting hole of an adjacent working face, the grouting wall casting machine set (2) consists of 1 self-suction type double-liquid grouting pump (2-1) and 1-2 stirring tanks (2-2), and the self-suction type double-liquid grouting pump (2-1) is provided with two sets of self-suction pipes (4) and slurry conveying pipes (5);
the self-priming double-liquid grouting pump (2-1) is connected with a large-volume buffer tank (1-2) from a suction pipe (4) in one pass, the other pass is connected with a stirring tank (2-2) from the suction pipe (4), two passes of slurry conveying pipes (5) are fused into a mixed slurry conveying pipe (6) in one pass through a tee joint, and the tail end of the mixed slurry conveying pipe (6) is connected with a roadside pouring wall template (13);
the filling pump (1-1) of the end grouting filling unit (1) is connected with a goaf grouting hole (11) arranged along the goaf roof by an end grouting filling pipeline (9) through a roadside wall body embedded grouting pipe (10).
5. The method for roadside grouting wall casting and goaf grouting filling using coal gangue slurry as claimed in claim 4, wherein the roadside grouting wall casting template (12) is a filling bag, a fiber cloth flexible template or a rigid template.
6. The method for grouting wall and goaf grouting filling by using coal gangue slurry as claimed in claim 4, wherein the coal gangue slurry is formed by mixing coal gangue powder with particle size smaller than 3mm with water, and the solid mass concentration is 60% -80%.
7. The method for grouting wall and goaf grouting filling by using coal gangue slurry according to claim 4, wherein the grouting wall casting machine set (2) is added with an automatic cement unpacking machine and is connected with a stirring tank (2-2).
8. The method for grouting wall and goaf filling by coal gangue slurry according to claim 4, wherein a stirring shaft which is vertically arranged is arranged in the large-volume buffer tank (1-2), and stirring blades are arranged on the stirring shaft.
9. The method for grouting and filling the roadside grouting wall and the goaf according to claim 4, wherein the embedded grouting pipe (10) horizontally penetrates through the roadside grouting wall (8) and is communicated with the goaf, the diameter of the embedded grouting pipe (10) is 100-300 mm, the goaf grouting hole (11) is an inclined drilling hole, the top of the goaf grouting hole (11) faces the goaf and is communicated with the goaf, an included angle between the embedded grouting pipe (10) and the goaf grouting hole (11) is 10-45 degrees with a vertical line, and the embedded grouting pipe and the goaf grouting hole (11) lag behind a working face by 20-80 m are used for grouting and filling the coal gangue.
10. The method for filling the roadside grouting pouring wall and the goaf grouting according to claim 4, wherein the step 3 is specifically as follows:
outside the range of 50m of the advanced working surface, constructing a tilt goaf grouting hole (11) on a top plate close to the goaf side in advance, wherein the grouting hole (11) is inclined to the working surface, and the grouting hole (11) is communicated with the goaf after stoping;
the working face is mined back to form a roadside pouring wall space and a goaf grouting filling space;
a roadside pouring wall template (12) is laterally supported at the rear goaf of a hydraulic support (7) in the middle gate way;
the large system for goaf grouting filling is operated, coal gangue is crushed, water is added and stirred to prepare coal gangue slurry, and then the coal gangue slurry is conveyed into a large-volume buffer tank (1-2) positioned in a cut hole through a main pipeline (3) of one-pass pumping through an industrial filling pump;
operating a small system for roadside grouting and wall casting, adding cement and water into a stirring tank (2-2) to stir to prepare cement paste, sucking coal gangue slurry from a large-volume grouting tank (1-2) by a self-suction double-liquid grouting pump (2-1) through a suction pipe (4), sucking the cement paste from the stirring tank (2-2) by the suction pipe (4) by the other time, outputting the sucked slurry from the suction pipe (4) by two times through a two-time slurry conveying pipe (5), and injecting the mixed slurry into a roadside grouting wall template (12) which is arranged close to the rear of a fully-mechanized mining face hydraulic support (7) through a mixed slurry conveying pipe (6) after fusion to form a roadside filling wall (8);
after the filling pump of the tail end grouting filling unit (1) self-sucks or receives the gangue slurry of the large-volume buffer tank (1-2), the gangue slurry is pumped by a pump pressure, and is injected into a goaf through a tail end grouting filling pipeline (9) through a pre-buried grouting pipe (10) on a rear roadside filling wall (8) and goaf grouting holes (11) arranged on a gob-side entry retaining roof, so that goaf grouting filling is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310806792.0A CN116877132A (en) | 2023-07-03 | 2023-07-03 | Method for grouting and filling coal gangue slurry in roadside grouting pouring wall and goaf |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310806792.0A CN116877132A (en) | 2023-07-03 | 2023-07-03 | Method for grouting and filling coal gangue slurry in roadside grouting pouring wall and goaf |
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