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A method for anti-shock ground pressure of all-coal roadway

An all-coal roadway and anti-shock technology, which is applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems that the roadway surrounding rock properties have not been improved, and the interaction between synergistic components and surrounding rocks has not been considered, so as to achieve anti-shock Improvement of ground pressure performance, prevention of floor impact ground pressure, and reduction of reflected stress waves

Active Publication Date: 2017-01-25
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The patent specification with the application number CN201410374840.4 discloses a constant-resistance large-deformation bolt / cable and its design method, without considering the synergy between the components and the interaction between the components and the surrounding rock, and the properties of the roadway surrounding rock are also no improvement

Method used

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  • A method for anti-shock ground pressure of all-coal roadway
  • A method for anti-shock ground pressure of all-coal roadway
  • A method for anti-shock ground pressure of all-coal roadway

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Embodiment

[0030] In a working face of a certain mine, the thickness of the coal seam is 12m, the occurrence of the coal seam is stable, and the air inlet lane is 21m 3The arched section of the straight wall is an all-coal roadway, which has a strong impact risk. During the excavation, a 90m long roadway was selected to carry out the following three types of support tests:

[0031] Test section 1: The length of the roadway is 30m, and it is supported by conventional anchor cables with steel strands, that is, the support method of "bolt + iron mesh + steel belt" plus steel strand anchor cables is adopted on the roof of the roadway. Among them, the anchor length is 2.2m, the spacing is 0.8m, the row spacing is 0.8m, the anchor cable diameter is 17.8mm, the length is 7m, the anchor cable spacing is 1.6m, and the row spacing is 1.2m. The two gangs are supported by "anchor + iron mesh + steel belt". The length of the anchor is 2.2m, the spacing is 0.8m, and the row spacing is 0.8m.

[0032] ...

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Abstract

The invention provides an impact ground pressure preventing method of a full seam gateway. The method is that an impact preventing support consisting of energy absorbing steel beams and energy absorbing anchor rod ropes is added on the basis of the general support composed of an iron wire net, a steel belt and an anchor rod, wherein the energy absorbing steel beams are lengthways distributed at intervals along the gateway, comprising two layers of steel plates, and energy absorbing boxes which are fixed at intervals between the two layers of steel plates; gateway surrounded rock in a propping plate and two sides is drilled and grouted, so that the gateway surrounded rock can damp the impact; two bottom corners of the gateway within the advance influence range of a workface are blasted to release pressure. According to the method, the general support, the impact preventing support, the surrounded rock modification and the blasting and pressure release of the bottom corners of the gateway are synchronously carried out to form a point-line-face-body 3D distribution type energy absorbing and impact preventing system; the incident stress wave can be reduced through the support system, and the reflecting stress wave of the gateway surface can be reduced; the modified loose surrounded rock mass can greatly reduce the influence of the impact energy on the support structure; the four measures supplement each other and synergistically interacted, so that the impact ground pressure preventing capacity of the gateway can be greatly improved.

Description

technical field [0001] The invention relates to underground safety protection of coal mines, in particular to a method for preventing shock and ground pressure in an all-coal roadway. Background technique [0002] With the continuous increase of coal mine mining depth and mining intensity, the frequency and intensity of rock bursts are also increasing. When rock bursts occur, a large amount of elastic compression energy is released instantly, which will cause serious damage to the roadway, causing heavy casualties and equipment. loss of safety incidents. Therefore, how to prevent the roadway from being damaged by rock burst has become a major problem to be solved urgently in coal mining. [0003] At present, most of the support methods for the surrounding rock of impact dangerous roadways are anchor bolts, anchor cables, steel arches and strong supports, or a combination of several support methods. The most commonly used is to set the conventional support consisting of bar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/00E21D20/02F42D3/00
Inventor 王爱文潘一山赵宝友李忠华
Owner LIAONING TECHNICAL UNIVERSITY
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