A kind of roadway support method to prevent rock burst

Abstract

The invention discloses a roadway support method for preventing rock burst. The roadway support method includes the following steps that a, according to mine vibration signals measured under a coal mine and located at different energy levels, the vibration frequency range under the coal mine is obtained; b, metamaterial energy-absorbing slabs are manufactured, and the wave-absorbing frequency band of the slabs is within the mine vibration frequency range; c, a roadway is excavated according to the shape of a roadway section, anchor rod drilling holes are drilled in a hanging arch range, and the metamaterial energy-absorbing slabs are anchored to a roof and a lane side of the roadway through anchor rods. By means of the wave-absorbing performance of a metamaterial, shock waves of rock burst can be absorbed actively, and the intensity of rock burst is relieved, so that the support effect is enhanced, and the safety protection coefficient of workers under the mine is increased.

Description

technical field [0001] The invention relates to a roadway support method for preventing rock burst, in particular to a roadway support method using energy-absorbing materials. Background technique [0002] With the increase of coal mining depth and the expansion of mining range, the phenomenon of underground rock burst is becoming more and more serious. The phenomenon of rock burst occurs because the pressure in the coal rock mass exceeds the strength limit of the coal rock mass, and the energy accumulated in the coal rock mass around the roadway or stope is released suddenly, and an explosive accident occurs in the mine roadway, and the power throws the coal rock It is a kind of mine earthquake induced by mining, which not only causes damage to shafts, casualties, and damage to buildings on the ground, but also causes gas, coal dust explosions and floods, which interferes with the ventilation system and seriously threatens coal mines. production safety. [0003] In the pr...

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Problems solved by technology

[0003] In the prior art, three support methods are mainly used for roadway support: the first is passive rigid support, such as the composite support technology of masonry, U-shaped steel fully enclosed bracket and shed and then sprayed grout, but in the ground pressure When the impact force is large, the support body is easy to be crushed, fractured and broken; the second is to use composite support technologies such as anchor rods, anchor cables, mesh and shotcrete, and superficial surrounding rock grouting. Under stress conditions, this kind of anchor will have a large overall deformation, and even break the anchor rod and anchor cable, resulting in accidents; the third is to first let the pressure deform, release part of the stress, and then carry out the anchor rod, anchor cable, mesh, steel belt, and sprayed concrete Composite support, or use brackets, masonry to reserve deformation or cushion, or use large-deformation anchor cables, but this support method needs to take measures to relieve pressure in advance, the amount of work is large, and the support process is relatively complicated

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