CN-116085033-B - Grouting filling gangue disposal method and grouting filling gangue disposal system

CN116085033BCN 116085033 BCN116085033 BCN 116085033BCN-116085033-B

Abstract

The invention belongs to the technical field of mining, and in particular relates to a grouting filling gangue disposal method and a grouting filling gangue disposal system, wherein the grouting filling gangue disposal method comprises the steps of judging direct top stability, determining direct top type, calculating direct top filling coefficient, determining basic top pressing step distance, determining preset included angle between the extending direction of a working face of a goaf and the horizontal plane, determining grouting hole height and grouting hole position top plate sinking amount, and determining a filling lag distance according to the type of the direct roof, the height of the grouting hole, the filling coefficient of the direct roof, a preset included angle between the extending direction of the working face of the goaf and the horizontal plane and the basic roof pressing step distance, and performing grouting filling according to the filling lag distance. The grouting waste filling disposal method can improve the filling amount of the waste filling and the stability and safety of the waste filling.

Inventors

YU JIANHAO
HUANG ZHIZENG
LIU PENGLIANG
FAN ZHIZHONG
CUI FENG
PAN LIMING
WANG HAOYU

Assignees

中煤科工开采研究院有限公司
天地科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20221222

Claims (8)

1. The grouting filling gangue disposal method is characterized by comprising the following steps of: judging the direct roof stability and determining the type of the direct roof; Calculating a direct top filling coefficient, wherein the direct top filling coefficient is calculated through the direct top thickness and the coal seam mining thickness, and the direct top filling coefficient meets n=h i /1.3h m , n is the direct top filling coefficient, h i is the direct top thickness, and h m is the coal seam mining thickness; determining a basic top pressing step distance; Determining that a preset included angle is formed between the extending direction of the working surface of the goaf and the horizontal plane; Determining the height of a grouting hole; The top plate of the grouting hole is sunk; determining a filling lag distance according to the type of the direct roof, the height of a grouting hole, a filling coefficient, a preset included angle between the extending direction of a working surface of a goaf and the horizontal plane and a basic roof pressing step distance, and grouting filling according to the filling lag distance; When the direct roof is an unstable direct roof or a medium stable direct roof, and the direct roof filling coefficient n is less than 1, the goaf lag filling distance satisfies: , When the direct roof is an unstable direct roof or a medium stable direct roof, and the direct roof filling coefficient n is more than or equal to 1, the goaf lag filling distance L meets the following conditions: , The direct roof is a stable direct roof, and the delayed filling distance L of the goaf is L= (h-Deltah)/sin alpha, wherein L is the delayed filling distance of the goaf, L is the basic roof pressing step distance, alpha is a preset included angle between the extending direction of the working face of the goaf and the horizontal plane, h is the height of a grouting hole, and Deltah is the sinking amount of a top plate of the grouting hole.
2. The grouting filling gangue disposal method according to claim 1, wherein, A concrete wall is arranged at one side of the gob-side entry retaining adjacent to the goaf, a brick wall is arranged between two adjacent concrete columns when the length of the concrete wall reaches a lagging filling distance, a first grouting hole is arranged at one end of the brick wall adjacent to the ground, a grouting pipeline is communicated with the first grouting hole, When the space between the goaf working surface cutting hole and the goaf meets the lagging filling distance of the goaf, grouting is conducted to the goaf through a grouting pipeline, an observation hole is arranged at the upper end of the brick wall, and grouting is stopped when slurry is diffused to one end of the gangue blocking support close to the goaf.
3. The grouting and gangue filling disposal method according to claim 1, wherein when the gob-side entry retaining length reaches twice the goaf lag filling distance, a second grouting hole is provided in the brick wall, and the distance between the second grouting hole and the first grouting hole satisfies the goaf lag filling distance.
4. A grouting filling gangue disposal system is characterized by comprising a gangue blocking bracket and a grouting pipeline, wherein the gangue blocking bracket is arranged at one end of a return air connecting roadway close to a goaf, And arranging the grouting pipeline in the return air connecting channel, wherein one end of the grouting pipeline extends into the goaf.
5. The grouting filling gangue handling system of claim 4, further comprising a transition support base and a pushing cylinder, wherein one end of the transition support base is connected with one end of the pushing cylinder, the other end of the pushing cylinder is connected with the gangue blocking support, and the pushing cylinder extends along with the goaf working surface tangential direction to the goaf working surface extending direction.
6. The grouting filling gangue handling system of claim 5, further comprising a plurality of concrete columns and brick walls, wherein a plurality of concrete columns are arranged at one end of the gangue blocking support far away from the goaf, the plurality of concrete columns are arranged at intervals in the extending direction of the working face of the goaf, the brick walls are arranged by two connected concrete columns, a first grouting hole is arranged at one end of the brick wall close to the ground, and one end of the grouting pipeline extends into the first grouting hole.
7. The grouting filling gangue handling system of claim 6, wherein the spacing between the plurality of concrete columns is A and A is 800mm < 1000mm.
8. The grouting filling waste disposal system of claim 7, further comprising a first pump, an outlet of the first pump in communication with the grouting conduit.

Description

Grouting filling gangue disposal method and grouting filling gangue disposal system Technical Field The invention belongs to the technical field of mining, and particularly relates to a grouting filling gangue disposal method and a grouting filling gangue disposal system. Background Along with the high-intensity exploitation of coal in China, a large amount of gangue solid waste is generated in the coal mine production process, and the gangue solid waste gradually becomes the first industrial solid waste in China due to the huge output of gangue. In order to adapt to the increasingly strict environmental protection policy of China, the slurry filling is used as a novel coal gangue solid waste disposal mode with high efficiency, large capacity and low interference, and the slurry filling is gradually popularized to a certain extent in western coal production bases of China. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a grouting waste filling disposal method, which can improve the filling amount of waste filling and the stability and safety of waste filling. The grouting filling gangue disposal method is characterized by comprising the following steps: judging the direct roof stability and determining the type of the direct roof; calculating a direct top filling coefficient; determining a basic top pressing step distance; Determining that a preset included angle is formed between the extending direction of the working surface of the goaf and the horizontal plane; Determining the height of a grouting hole; The top plate of the grouting hole is sunk; and determining a filling lag distance according to the type of the direct roof, the height of the grouting hole, the filling coefficient, a preset included angle between the extending direction of the working face of the goaf and the horizontal plane and the basic roof pressing step distance, and performing grouting filling according to the filling lag distance. The grouting waste filling disposal method provided by the embodiment of the invention can improve the filling amount of the waste filling and the stability and safety of the waste filling. In some embodiments, the direct roof fill factor is calculated from the direct roof thickness and the coal seam mining thickness, and the direct roof fill factor satisfies n = h i/1.3 hm, where n is the direct roof fill factor, h i is the direct roof thickness, and h m is the coal seam mining thickness. In some embodiments, the direct roof is an unstable direct roof or a moderately stable direct roof, and the direct roof filling factor n <1, the goaf lag filling distance satisfies: when the direct roof is an unstable direct roof or a medium stable direct roof, and the direct roof filling coefficient n is more than or equal to 1, the goaf lag filling distance L meets the conditions that L=l-e n/2, When the direct roof is a stable direct roof, the hysteretic filling distance L of the goaf is L= (h-Deltah)/sin alpha, wherein L is the hysteretic filling distance of the goaf, L is the basic roof pressing step distance, alpha is a preset included angle between the extending direction of the working face of the goaf and the horizontal plane, and Deltah is the sinking amount of the top plate of the grouting hole. In some embodiments, a concrete wall is arranged on one side of the gob-side entry retaining adjacent to the goaf, when the length of the concrete wall reaches the lagging filling distance, a brick wall is arranged on two adjacent concrete columns, a first grouting hole is arranged at one end of the brick wall adjacent to the ground, a grouting pipeline is communicated with the first grouting hole, When the space between the working face cut hole and the goaf meets the lagging filling distance of the goaf, grouting is conducted to the goaf through a grouting pipeline, an observation hole is arranged at the upper end of the brick wall, and grouting is stopped when slurry is diffused to one end of the gangue blocking support close to the goaf. In some embodiments, when the gob-side entry retaining length reaches twice the lagging filling distance, a second grouting hole is arranged on the brick wall, and the distance between the second grouting hole and the first grouting hole meets the lagging filling distance of the goaf. The grouting filling gangue disposal system of the embodiment of the invention is characterized by comprising a gangue blocking bracket and a grouting pipeline, wherein the gangue blocking bracket is arranged at one end of a return air connecting roadway close to a goaf, And arranging the grouting pipeline in the return air connecting channel, wherein one end of the grouting pipeline extends into the goaf. In some embodiments, the grouting filling gangue handling system further comprises a transition support base and a pushing cylinder, one end of the transition