Method for controlling tectonic rock burst in coal mine tunneling

A technology of rock burst and coal mine roadway, which is applied in ground mining, mining equipment, earthwork drilling and mining, etc., to prevent structural stress, increase the thickness of rock strata, and reduce the risk of impact

Inactive Publication Date: 2014-01-08
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to propose a structural rockburst prevention method during coal mine roadway excavation based on the principle of pressure-diffusion to solve the problem of fully releasing the energy of deep roadway excavation structure rockburst

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  • Method for controlling tectonic rock burst in coal mine tunneling
  • Method for controlling tectonic rock burst in coal mine tunneling
  • Method for controlling tectonic rock burst in coal mine tunneling

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Embodiment Construction

[0019] The present invention is specifically implemented as follows:

[0020] Step 1: During the excavation process of rock burst dangerous coal seams, through analogy, analysis and judgment of roadway rock burst appearance characteristics, and at the same time, according to the structural distribution of excavation, use the actual observation method of in-situ stress to observe the in-situ stress , to obtain the magnitude and direction of the in-situ stress, and then use the drilling cuttings monitoring method to conduct on-site detection, and divide the structural high-stress area as the key area for the prevention and control of structural rock burst;

[0021] According to the strength of the stress distribution, delineate the dangerous area, see figure 1 The part shown on the right.

[0022] Step 2: Drill a row of high-strength yielding grouting anchors along the direction of the roadway on the top of the roadway roof that is being excavated in the above-mentioned key pre...

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Abstract

The invention discloses a method for controlling tectonic rock burst in coal mine tunneling. The method comprises the following steps of: defining a tectonic rock burst danger area; erecting a row of high-strength yielding grouting anchor rods at the top of a tunnel roof being tunneled in the key controlling area along the tunnel; when the yielding grouting anchor rods perform primary yielding through a W steel belt and secondary yielding through a yielding pipe, grouting the gaps of the tectonic area through a grouting device at the tail ends of the yielding grouting anchor rods; and after the tunnel roof is cured, continuing to tunnel forward. In the invention, as the high-strength yielding grouting anchor rods are mounted at the middle part of the tunnel in the tectonic area, the danger of tectonic rock burst is fundamentally reduced; and by adopting the yielding grouting anchor rods for support, the anchor rods can be effectively prevented from being broken by the rock burst load so as to realize the support effect.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] Some coal mines are mines with complex structures, large changes in the occurrence of coal seams, and large differences in coal and rock structures. With the increase of mining depth, the boundary conditions of mining become more complicated, and the rock burst caused by geological structure becomes more prominent. The rockburst in the structural area and the dynamic stress field formed by mining is becoming more and more serious. The front of the roadway excavation process is often accompanied by abnormal structure, coal and rock layer structure, large dynamic stress changes and gas anomalies. Therefore, deep wells with complex coal seams Roadway excavation rock burst prevention is a technical problem that needs to be solved at present. The danger caused by structural rock bursts that occur during roadway excavation continues to increase. At present, the preve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16E21D20/02
Inventor 潘立友
Owner SHANDONG UNIV OF SCI & TECH
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