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Filling mining method for fully mechanized top coal caving working face

A fully mechanized roof caving and mining method technology, which is applied in the direction of filling, ground mining, mining equipment, etc., can solve the problems of large surface deformation, etc., and achieve the effects of increased density, strong stability, and enhanced filling and support effects

Active Publication Date: 2019-02-19
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems of roof control in fully mechanized top-coal caving working faces and large surface deformation in top-coal caving mining, the present invention provides a filling mining method applied to fully mechanized top-coal caving working faces. The specific technical scheme is as follows

Method used

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  • Filling mining method for fully mechanized top coal caving working face
  • Filling mining method for fully mechanized top coal caving working face
  • Filling mining method for fully mechanized top coal caving working face

Examples

Experimental program
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Effect test

Embodiment 1

[0034] like figure 1 and image 3 As shown, the specific construction steps of a backfill mining method applied to a fully mechanized top coal caving face include:

[0035] Step A. When the fully mechanized top coal caving working face is arranged in a hard coal seam with uniform thickness and there is no large fault in the working face, the fully mechanized top coal caving working face is divided into filling area 5 and roof caving along the working face trend. Coal Zone 6. The length of the backfill area 5 and the top coal caving area 6 is equal to the length of the working face, the sum of the width of the backfill area 5 and the top coal caving area 6 is equal to the width of the working face, and it is ensured that the length and width of the top coal caving area are smaller than the basic top pressure. Step distance, where the backfill area 5 and the top coal caving area 6 are adjacent. The fully mechanized top coal caving working face is divided into several filling ...

Embodiment 2

[0047] On the basis of Embodiment 1, the backfill mining method applied to the fully mechanized top coal caving face is further described in combination with engineering examples. The underground elevation of the fully mechanized top coal caving face in a mine is -241.3m, and the main coal seam is Shanxi Group 3 coal seam. The strike length of the working face is 700m, the inclination length is 150m, the average thickness of the coal seam is 8.5m, the inclination angle is 5~8°, and the bulk density is 1.38t / m 3 . The direct top is dark gray siltstone, generally 2-3m thick, relatively stable, with a compressive strength of 40.53-62.81MPa; the old top is a thick layer of medium-grained sandstone, 10-30m thick, with a hard rock formation and a compressive strength of 91.20-131.7MPa.

[0048] Step A. According to the surrounding rock properties of the above-mentioned stope geological conditions, determine that the width of the top coal caving area 6 is 10m, the width of the filli...

Embodiment 3

[0054] On the basis of Embodiment 1, the backfill mining method applied to the fully mechanized top coal caving face is further described in combination with engineering examples. In a fully mechanized top coal caving working face, the strike length of the working face is 800m and the inclination length is 200m. The average thickness of the coal seam at the working face is 9m, which is a stable coal seam. The average dip angle of the coal seam is 9°. The direct top is mudstone with an average thickness of 1.4m, and the average one-way compressive strength is 47.7MPa. The basic top is fine sandstone with an average thickness of 3.0m, and the average unidirectional compressive strength is 119.8MPa. The direct bottom is mudstone with an average thickness of 2.4m, and the average one-way compressive strength is 47.7MPa, and the basic bottom is fine sandstone with an average thickness of 3.9m, and the average one-way compressive strength is 119.8MPa.

[0055] Step A. According to ...

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Abstract

The invention provides a filling mining method for a fully mechanized top coal caving working face, and relates to the technical field of mining engineering. The technical problems of control over a roof of the fully mechanized top coal caving working face and large deformation of a top coal caving mining surface are solved. The filling mining method comprises the steps that A, the fully mechanized top coal caving working face is divided in the extending direction of the working face into a filling area and a top coal caving area, or the working face is divided in the extending direction and the inclination direction into a filling area and a top coal caving area; B, a working face cycle step pitch is determined; C, the filling area in front of the working face is supported, and when coalcaving of the top coal caving area is completed, round wood supports are erected in the filling area; D, after the filling area reaches a filling step pitch, a filling tarpaulin is arranged behind a hydraulic support, and filling paste is pumped; and E, the steps C and D are repeated to complete the mining. The mining method of alternating coal caving and filling is provided to complete filling and mining of the top coal caving working face, a roof is effectively controlled, surface subsidence is reduced, and the method further has the advantages such as safety and high efficiency.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a sub-regional coal caving and backfill mining method for fully mechanized top coal caving working face. Background technique [0002] At present, in the fully mechanized top coal mining, the roof of the goaf is treated by the caving method. The caving of the roof will cause surface subsidence, especially in the mining of thick coal seams. Destruction of surface water. At the same time, the accumulation of a large amount of gangue produced by top coal mining will cause environmental pollution. Backfill mining is an effective method to solve the problem of surface subsidence at present, especially the gangue filling process can not only digest the gangue but also effectively reduce the surface subsidence. However, due to the caving of the top coal in the fully mechanized caving caving process and the complex occurrence of the mine pressure in the goaf, the space for f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18E21F15/08
CPCE21C41/18E21F15/08E21F15/02
Inventor 陈绍杰杜兆文夏志国张振陈兵李志远简勇
Owner SHANDONG UNIV OF SCI & TECH
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