Impact ground pressure preventing method of full seam gateway

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...

AI Technical Summary

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

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