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Large inclined angle coal seam gob-side entry retaining flexible roadway protection method

A technology of large inclination and empty roadway retention, which is applied to earth-moving drilling, other household appliances, mining equipment, etc., can solve the problems of high cost of roadway protection, affecting the normal production of working face, and complicated technical process.

Inactive Publication Date: 2020-09-29
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical difficulties of the existing gob-side retaining technology, such as complex process, high cost of road protection, and affecting normal production of the working face, the present invention provides a flexible method for retaining roadways along the gob-side of coal seams with large dip angles. The method is to work in the roadway A certain size of advance groove is constructed in front of the front, and the reinforcement mesh is arranged through the top and bottom plates to form a flexible structure in the advance groove, which intercepts and wraps the gangue that collapses and slides in the goaf, and forms a roadside support body with the collapsed gangue as the aggregate. The stability of the surrounding rock of the roadway is maintained by the joint support of the roadside support body and the roadway anchor net cable joint support

Method used

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  • Large inclined angle coal seam gob-side entry retaining flexible roadway protection method
  • Large inclined angle coal seam gob-side entry retaining flexible roadway protection method
  • Large inclined angle coal seam gob-side entry retaining flexible roadway protection method

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Embodiment Construction

[0115] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0116] A flexible roadway protection method for gob-side entry retention in a large dip angle coal seam, the method includes the following steps:

[0117] 1) Production of reinforcement mesh for roadway protection

[0118] The test site was selected as the 3153 working face 4 of a mine in Sichuan Province. The coal mining method of the working face was the longwall comprehensive mechanized coal mining method with a pseudo-slant trend, the pseudo-slope angle was 35°, and the natural caving method was used to treat the mined-out area 47. The buried depth of working face 4 in the test section is 552-582m, the inclination length of working face 4 is 110m, the strike length is 900m, the average mining height is 2.6m, and the average inclination angle of coal seam is 46°. The roof rock layer 48 and the floor rock layer 49 of the working fa...

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Abstract

The invention discloses a large inclined angle coal seam gob-side entry retaining flexible roadway protection method which comprises the following specific steps: at the lower end of a working face, adopting a digging and blasting manner to construct an advance groove with the length being 5-10 m and the width being 3-5 m along the working face trend; in the advance groove, fixing an anchor rod through a top plate and a bottom plate, and arranging a specially-made reinforcing mesh to form a flexible structure; intercepting and wrapping gangue collapsing and sliding from a goaf to form a roadway-side supporting body; and enabling the roadway-side supporting body and a cable anchor in the roadway to jointly support and act to maintain the stability of roadway retained surrounding rock. The large inclined angle coal seam gob-side entry retaining flexible roadway protection method has the characteristics of being small to influence to working face production, low in roadway retained cost,simple in technology and high in roadway retained speed.

Description

technical field [0001] The invention belongs to the technical field of roadside support for gob-side entry retention, and in particular relates to a flexible entry protection method for gob-side entry retention in large-inclination coal seams. [0002] technical background [0003] Gobside retaining is a technology to maintain the original mining roadway along the edge of the goaf after mining in the working face. The use of gob-side entry retaining technology can prevent mine disasters caused by coal pillars, and at the same time improve coal recovery rate, reduce roadway excavation rate, reduce the cost per ton of coal, and alleviate the tension of mining replacement. [0004] The mining conditions of coal resources in my country are complicated, and the coal production of coal seams with large dip angles (35°-55°) accounts for about 10% of the total coal production in the country. In recent years, as the application of gob-side entry technology in the mining of near-horiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F15/04E21F15/00E21D15/00G06F30/17B21F27/20
CPCB21F27/20E21D15/00E21F15/00E21F15/04G06F30/17
Inventor 唐建新王艳磊袁芳孔令锐李成候阳阳王育林张择靖李伟李霜
Owner CHONGQING UNIV
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