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Horizontal segment blast cracking and chemical weakening method for igneous rock in thick coal seam

A technology of segmental blasting and igneous rock, which is used in earth-moving drilling, fire prevention, and fluid extraction, etc., and can solve the problems of high production cost, low production efficiency, and large rock size.

Inactive Publication Date: 2016-08-31
TAIYUAN UNIV OF TECH
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Problems solved by technology

However, all related methods have the problems of low production efficiency and high production cost. In addition, the more important thing is that the rock mass after blasting is relatively large, and still needs to be cut by a shearer, which has not effectively fundamentally Solve the problem

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  • Horizontal segment blast cracking and chemical weakening method for igneous rock in thick coal seam
  • Horizontal segment blast cracking and chemical weakening method for igneous rock in thick coal seam
  • Horizontal segment blast cracking and chemical weakening method for igneous rock in thick coal seam

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Embodiment Construction

[0023] specific implementation

[0024] The specific embodiments of the present invention will be further described below, and the specific embodiments are only to explain the technical solutions of the present invention, and do not limit the present invention.

[0025] To implement the chemical weakening method for igneous rock horizontal subsection blasting in a thick coal seam provided by the present invention, the method is carried out according to the following steps:

[0026] Step 1: Use seismic CT technology to find out the distribution law and corresponding orientation of igneous rocks in thick coal seams, as shown in the appendix. figure 1 shown.

[0027] Step 2: On the side of the return air level road and the transport level road corresponding to the part containing the igneous rock close to the working face, use the previously drilled holes for water injection in the coal seam. The holes are arranged alternately up and down, that is, the "three flower eye" arrang...

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Abstract

The invention provides a horizontal segment blast cracking and chemical weakening method for igneous rock in a thick coal seam. The method comprises the following steps: forming water injection drilling holes and a plurality of V-shaped grooves on one sides, close to working surfaces, of a tail entry and a haulage entry; carrying out a sampling test on the igneous rock, configuring a corresponding chemical solution, and determining the concentration, solution injection volume and solution injection time of the chemical solution; and then carrying out charging, stemming and sealing, and connecting a detonating cord for blasting. According to the invention, a physical method and a chemical method are combined, so that the general problem of difficult pushing of the igneous rock in the coal seam of the existing coal mine is solved; and the process is simple, the cost is low, the benefit is good, and the safety production of the coal mine is realized to the maximum extent.

Description

technical field [0001] The invention relates to a chemical weakening method for igneous rocks in thick coal seams in coal mining, in particular to a method for chemically weakening igneous rocks in thick coal seams by horizontal subsection blasting and cracking. Background technique [0002] With the increase of mining depth, the erosion of igneous rocks in coal seams has gradually become a common problem and a major problem in coal mining. Most of the igneous rocks in the coal seam are formed by the molten magma formed by the complex geological activities of the lower parent rock material moving upward. Due to the relatively low strength of the coal, the molten magma directly intrudes into the coal seam on a large scale, and is formed by cooling and solidification. The intrusion of igneous rock into the coal seam destroys the integrity of the coal seam, causes the instability of the coal seam distribution, and seriously affects the normal production and economic benefits of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C37/12E21B43/263E21B49/00E21F5/00
CPCE21B43/263E21B49/00E21C37/12E21F5/00
Inventor 杨永康张彦斌康天合季春旭郭泽峰张智敏
Owner TAIYUAN UNIV OF TECH
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