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A method for chemical weakening of igneous rocks in thick coal seams by horizontal segmental blasting

A segmented blasting and igneous rock technology, which is applied in earthwork drilling, fire prevention, fluid mining, etc., can solve the problems of low production efficiency, large rock mass and high production cost

Inactive Publication Date: 2018-02-16
TAIYUAN UNIV OF TECH
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  • Description
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  • Application Information

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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

Method used

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  • A method for chemical weakening of igneous rocks in thick coal seams by horizontal segmental blasting
  • A method for chemical weakening of igneous rocks in thick coal seams by horizontal segmental blasting
  • A method for chemical weakening of igneous rocks in thick coal seams by horizontal segmental blasting

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Embodiment Construction

[0023] specific implementation plan

[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] Implement the method for chemical weakening of igneous rock horizontal segmental blasting cracking in a kind of thick coal seam provided above by the present invention, this method is to carry out according to the following steps:

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

[0027] Step 2: On the side of the return air entry and transport entry that are close to the working face corresponding to the part containing igneous rocks, use the previous coal seam water injection drilling. The design of the drilling is: the drilling rig drills two rows of horizontally ...

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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 method for chemical weakening of igneous rocks in thick coal seams in coal mining, in particular to a method for chemical weakening of igneous rocks in thick coal seams by horizontal segmental 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 rock in the coal seam is formed by the upward movement of the molten magma formed by the lower parent rock material through complex geological activities. Because the strength of the coal is relatively low, the molten magma directly intrudes into the coal seam in a large range 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 distribution of the coal seam, and seriously affects the normal production and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C37/12E21B43/263E21B49/00E21F5/00
CPCE21B43/263E21B49/00E21C37/12E21F5/00
Inventor 郭睿郝惠琴郭兴运杨永康张彦斌康健婷付运凯康天合季春旭吴云飞张智敏郭泽峰
Owner TAIYUAN UNIV OF TECH
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