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Working face tailgate crushed coal grouting reinforcing method

A technology for grouting reinforcement and working face, applied in chemical instruments and methods, earthwork drilling, wellbore lining, etc., can solve the problems of low support resistance, poor roadway maintenance effect and high cost, and achieve higher bearing capacity and better maintenance. Condition, the effect of strong adhesion

Active Publication Date: 2017-05-31
CHINA MINING & CIVIL NEW MATERIAL SCI & TECH LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For broken surrounding rocks and high-stress roadways, only bolt support or shed support is not only costly, but the support resistance is small, and the maintenance effect of the roadway is poor.

Method used

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  • Working face tailgate crushed coal grouting reinforcing method
  • Working face tailgate crushed coal grouting reinforcing method

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Embodiment Construction

[0014] In order to enable those skilled in the art to better understand the present invention, the present invention will be further clearly and completely described below in conjunction with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0015] A grouting reinforcement method for broken coal in return air level roadway of working face, comprising:

[0016] Several rows of grouting holes with a row distance a of 1.8m are arranged on the cut coal side of the return air level roadway. c is 0.2m;

[0017] In each row of grouting holes, the hole elevation angle α of the uppermost grouting hole is 30°, and the vertical projection length d of the grouting hole is 1.9m; ​​the hole elevation angle β of the middle grouting hole is 25° , and the horizontal projection length e of the grouting ...

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Abstract

The invention provides a working face tailgate crushed coal grouting reinforcing method. The method solves the problem that tailgate surrounding rock is difficult to maintain due to expansion, loosening, crushing and the like. According to the method, a plurality of rows of grouting holes are formed in a coal cutting side, each row of grouting holes includes three grouting holes different in elevation angle, and grouting is conducted by means of special quick-solidified materials. By means of grouting reinforcing, the structure and properties of the surrounding rock are improved, the roadway surrounding rock bearing capacity is improved, and the crushed surrounding rock maintenance condition is effectively improved. Meanwhile, stable and reliable strength points are provided for anchor rod supporting, and the anchoring force of anchor rods in the crushed surrounding rock is improved. Besides, the brand new grouting materials are used in the method, the grouting materials are high in solidification speed, and slurry forming the high-water materials solidifies within 20-40 min, is high in early strength, quick in increase, high in residual strength, free of toxins and harm and little in corrosion.

Description

Background technique [0001] When excavating a roadway in a coal seam or broken surrounding rock subjected to mining support stress, the original discontinuous medium with various weak surfaces—coal and rock mass are in an original equilibrium state. After the roadway is excavated, this equilibrium state is destroyed. The surrounding rock of the roadway releases a large amount of energy due to deformation, and the original weak surface of the surrounding rock further expands, and new cracks are generated at the same time. The surrounding rock expands, loosens, and breaks, with large deformation, strong pressure, and long flow time. If inappropriate maintenance measures are adopted, the surrounding rock of the roadway will deform more violently and the support will be difficult, which will eventually lead to the destruction of the roadway. In order to improve roadway maintenance, two effective measures can be taken, one is to improve the surrounding rock structure and its perfor...

Claims

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Application Information

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IPC IPC(8): E21D11/10C04B28/14C09K8/46
CPCC04B28/14C09K8/46E21D11/105C04B7/00C04B22/10C04B14/104C04B22/124
Inventor 刘冲
Owner CHINA MINING & CIVIL NEW MATERIAL SCI & TECH LTD
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