CN-122014341-A - Goaf treatment method for mechanized mining face of vertical trough coal

CN122014341ACN 122014341 ACN122014341 ACN 122014341ACN-122014341-A

Abstract

The application relates to the technical field of coal exploitation, in particular to a goaf treatment method for a mechanized exploitation working face of vertical trough coal, which fills a goaf formed by stoping along the inclined direction of a coal bed. The hydraulic support is used for forming a support above a working surface of the vertical trough coal, after the hydraulic support moves, a gap between the hydraulic support and a coal seam roof and a gap between the hydraulic support and the coal seam are blocked, a retaining wall is formed by using a baffle plate of a return air along groove well and a material conveying along groove well, a foam material is filled above the hydraulic support to block the hydraulic support, finally cementing materials are injected into a goaf to be filled through high-level filling equipment to complete filling to form a filling area, roof cutting and bottom cutting operations are performed above the coal mining working surface when the filling height of the grouting above the hydraulic support reaches 50m to 100m to form a damage area and a crack area, the high-strength cementing materials are filled into the damage area and the crack area, and a self-stabilizing wall seat structure is formed at a cutting position of the roof and the bottom plate, so that good safety guarantee is provided for mining of the vertical trough coal.

Inventors

JIN ZHIYUAN
MA LIQIANG
HAN YONGQIANG
PENG MINGQI
LI GUANGLIANG
Ainur Abdul's Joint Forces
WANG CHAOYANG
LIU QINGLI
AN YI

Assignees

天山实验室
新疆工程学院
郑州煤矿机械集团有限责任公司
郑州郑煤设计工程有限公司
陕西科索矿业有限公司

Dates

Publication Date: 20260512
Application Date: 20260215

Claims (10)

1. A goaf treatment method for a mechanized mining working face of vertical trough coal is characterized by filling goafs formed by mining along the inclined direction of a coal bed, and comprises the following steps: S1, forming a support above a vertical trough coal mining working surface by utilizing a hydraulic support; s2, filling plugging materials above the hydraulic support to form a sealing area after the vertical trough coal mining working face is downwards mined for a preset distance; s3, pouring a cementing material in the goaf above the hydraulic support to form a filling area; And S4, setting a layer of rock columns in the goaf every 50-100 m of filling.
2. The method for processing the goaf on the mechanized mining face of the vertical trough coal according to claim 1, wherein the coal seam is a steeply inclined coal seam with an inclination angle of 60-90 degrees, the width of the vertical trough coal mining face in the direction of the trend is 200-300 m, the length of the vertical trough coal mining face in the direction of the inclination is 200-500 m, and the low-position reserved holes, the high-position reserved holes, the exhaust reserved holes and the overflow reserved holes are arranged on the hydraulic support at intervals.
3. The method for processing the goaf of the mechanized mining face of the vertical trough coal as claimed in claim 2, wherein in the step S2, the sealing area is formed by filling the plugging material above the hydraulic support, comprising: s21, plugging gaps among the hydraulic support below the goaf, the roof and the bottom plate of the coal seam and gaps among the hydraulic support; S22, closing a goaf between the baffle plates of the return air crossheading well and the material conveying crossheading well; s23, filling plugging materials above the hydraulic support to form a sealing area.
4. The method for processing goaf on mechanized mining face of vertical trough coal as recited in claim 3, wherein step S23 includes S231, mounting a first filling device on the mining face of vertical trough coal; s232, installing a low-level filling pipe, a high-level filling pipe, an exhaust pipe and an overflow pipe in the low-level preformed hole, the high-level preformed hole, the exhaust preformed hole and the overflow preformed hole respectively every 4 to 10 hydraulic supports, wherein the first end of the low-level filling pipe is positioned above the hydraulic supports; s233, communicating the second end of the low-level filling pipe with an outlet of the first filling equipment; s234, preparing a plugging material by the first filling equipment; S235, the first filling equipment fills the plugging material to the upper part of the hydraulic support through the low-level filling pipe to form a sealing area.
5. The method for goaf treatment on a mechanized mining face of coal in vertical slots as claimed in claim 4, wherein in step S212, the first end of the low-level filling pipe is located 0.2m to 0.5m above the highest point of the hydraulic support.
6. The method according to claim 4 or 5, wherein in step S212, the first end of the high-level filling pipe is not lower than the highest point of the goaf.
7. The method for processing the goaf of the mechanized mining face of the standing groove coal as claimed in claim 4 or 5, wherein the step S3 comprises: s31, mounting the second filling equipment on the ground; s32, communicating the second end of the high-level filling pipe with an outlet of second filling equipment; S33, preparing a cementing material by a second filling device; S34, the second filling equipment fills the cementing material to the goaf above the sealing area through the high-level filling pipe to form a filling area.
8. The method for processing the goaf of the mechanized mining face of the vertical trough coal as claimed in claim 6, wherein the step S3 comprises: s31, mounting the second filling equipment on the ground; s32, communicating the second end of the high-level filling pipe with an outlet of second filling equipment; S33, preparing a cementing material by a second filling device; S34, the second filling equipment fills the cementing material to the goaf above the sealing area through the high-level filling pipe to form a filling area.
9. The method for processing the goaf of the mechanized mining face of the vertical trough coal as claimed in claim 7, wherein the step S4 comprises: s41, carrying out roof cutting and bottom cutting operations above a coal face and forming a damage area and a crack area on two sides of a goaf every 50-100 m of filling; S42, preparing high-strength cementing materials by the second filling equipment, and filling the high-strength cementing materials into the damage areas and the fracture areas on the two sides of the goaf through the high-level filling pipe to form rock columns, wherein the height of the rock columns is 6-10 meters.
10. The method for processing the goaf of the mechanized mining face of the vertical trough coal as claimed in claim 8, wherein the step S4 comprises: s41, carrying out roof cutting and bottom cutting operations above a coal face and forming a damage area and a crack area on two sides of a goaf every 50-100 m of filling; S42, preparing high-strength cementing materials by the second filling equipment, and filling the high-strength cementing materials into the damage areas and the fracture areas on the two sides of the goaf through the high-level filling pipe to form rock columns, wherein the height of the rock columns is 6-10 meters.

Description

Goaf treatment method for mechanized mining face of vertical trough coal Technical Field The invention relates to the technical field of coal exploitation, in particular to a goaf treatment method for a mechanized exploitation working face of vertical trough coal. Background The goaf of the coal face is positioned above the coal face, and the gangue caving in the goaf of the coal face can cause great impact on the coal face and the hydraulic support, and the general goaf filling treatment method of the coal face mainly comprises dry filling, paste filling, high-water material filling, cemented filling, step-by-step filling and the like. The Chinese patent document with the publication number of CN120520578A discloses a steep near-vertical super-thick coal seam filling mining method and system, which comprises the steps of dividing the near-vertical super-thick coal seam into different mining levels of 20-40 m, arranging a low-position mining and releasing system at the junction horizontal position of the main section and the lower section, arranging a high-position filling system in a roof or a floor rock pillar at the junction horizontal position of the main section and the upper section, mining the main section coal seam by adopting a fully-mechanized mining method, paving a separation net and slurry blocking cloth on a goaf along with the pushing of a coal face through a lapping slurry blocking bracket, utilizing a high-suspended hole space detection characterization robot arranged in the high-position filling system to perform goaf space, dividing the near-vertical super-thick coal seam into different sections for sectional mining, performing in-situ grouting filling on the subsequent mining space in the process of mining, and forming a stable filling interface on the goaf. The Chinese patent document with the publication number of CN120291874A discloses a green mining method for filling a near-vertical super-thick coal seam to prevent and control disasters, which comprises the following steps of dividing the near-vertical super-thick coal seam into different sections according to the thickness of 20-40 m, mining each section by a fully-mechanized mining method, arranging slurry blocking cloth on a caving coal filling mining hydraulic support and paving an isolation net on a goaf after the coal mining working face is pushed by 8-10 m, grouting and filling the goaf through a high-level process roadway, dividing the near-vertical coal seam into a plurality of horizontal sections, adopting a descending mining sequence, and timely filling the goaf in cooperation with the goaf. At present, the goaf filling treatment methods are only applied to the situation that the goaf is positioned behind the coal face, but cannot be applied to mechanized mining technology of vertical trough coal overhead mining and goaf filling above the overhead coal face. Disclosure of Invention The invention provides a goaf treatment method for a mechanized mining working face of vertical trough coal, which overcomes the defects of the prior art, and can effectively solve the problems that the existing goaf filling method cannot be applied to the mechanized mining technology of the vertical trough coal overhead mining and the goaf filling above the working face after the overhead mining. The technical scheme of the invention is realized by the following measures that the goaf treatment method for the mechanized mining working face of the vertical trough coal fills the goaf formed by the downward mining along the inclined direction of the coal bed, and comprises the following steps: S1, forming a support above a vertical trough coal mining working surface by utilizing a hydraulic support; s2, filling plugging materials above the hydraulic support to form a sealing area after the vertical trough coal mining working face is downwards mined for a preset distance; s3, pouring a cementing material in the goaf above the hydraulic support to form a filling area; And S4, setting a layer of rock columns in the goaf every 50-100 m of filling. The following are further optimizations and/or improvements to the above-described inventive solution: The coal seam is a steeply inclined coal seam with an inclination angle of 60-90 degrees, the width of the vertical trough coal mining working face in the trend direction is 200-300 m, the length of the vertical trough coal mining working face in the inclination direction is 200-500 m, and low-position reserved holes, high-position reserved holes, exhaust reserved holes and overflow reserved holes are formed in a hydraulic support at intervals. In the step S2, filling the plugging material above the hydraulic support to form a sealing area includes: s21, plugging gaps among the hydraulic support below the goaf, the roof and the bottom plate of the coal seam and gaps among the hydraulic support; S22, closing a goaf between the baffle plates of the return air crossheading well and the material conveying cros