Method for reducing subsidence of stope overburden bed separation by grouting

A technology of layer separation and separation of overburden, applied in the field of coal mining, can solve problems such as low efficiency of separation and grouting and sedimentation reduction, and achieve the effects of saving equipment and engineering investment, improving recovery rate and improving effect.

Inactive Publication Date: 2013-07-24
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
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Problems solved by technology

[0007] In view of this, the object of the present invention is to propose a method for continuously integrated grouting filling and settlement reduction in the overly

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  • Method for reducing subsidence of stope overburden bed separation by grouting
  • Method for reducing subsidence of stope overburden bed separation by grouting
  • Method for reducing subsidence of stope overburden bed separation by grouting

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Embodiment Construction

[0032] The invention provides a grouting method for reducing the settlement of the stope overlying rock with a tendency to separate layers. In the method of the invention, no coal pillars are adopted between the working faces, so that the goaf is continuous, and the grouting hole is used to reach the target. Separation layer grouting below the key layer, the target key layer refers to the key layer whose fracture and subsidence are controlled by grouting into the separation layer below it; and with the mining of the new continuous working face, the separation layer will extend When the separation layer expands, the grouting hole will continue to be filled through the grouting hole, and the continuous goaf will be easier to achieve full mining, so that the separation layer will be more fully grouted, and the grouting will be more efficient after grouting. Stablize.

[0033] Step 1: According to geological exploration data, determine all key layers above the stope.

[0034] Usu...

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Abstract

The invention relates to a method for reducing subsidence of stope overburden bed separation by grouting, which comprises the following steps: determining all key layer positions over the stope; injecting grouting into the bed separation below a object key layer; along with the exploitation of the working face and the bed separation extending above a new goaf, continuously injecting grouting into the bed separation from an injection grouting aperture. Coal pillars are not kept between working faces, thereby improving the recovery rate of the mining area and forming continuous bed separations; the grouting injecting work is carried out after a fully mining degree of a rock stratum below the bed separation, thereby improving the effect for reducing subsidence by injecting and filling grouting. Further, there is no need to arrange a set of grouting injecting system along the tendency of the bed separation over every working face, thereby saving equipment and engineering investment.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to a method for reducing subsidence by applying overlying rock separation layer grouting in mines where surface damage is serious or surface subsidence needs to be controlled. Background technique [0002] The premise of the application of overlying rock grouting to reduce settlement technology is that after the coal seam is mined, a separation layer can be formed inside the overlying rock above the goaf. To support the overburden, thereby slowing the propagation of overburden movement to the surface. [0003] The key strata in the mined overburden have the following characteristics: geometric characteristics, relatively thicker than other same strata in the overburden; Higher; deformation characteristics, when the key layer subsides and deforms, the subsidence of all or part of the upper rock formations is coordinated synchronously, and these synchronously coordinated subsidence and def...

Claims

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Application Information

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IPC IPC(8): E21C41/18
Inventor 王志强范新民赵景礼
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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