Supporting method and device for preventing strong damage of roadway support and surrounding rock spanning

Abstract

The invention discloses a supporting method and device for preventing strong damage of a roadway support and surrounding rock spanning. A pressure relief groove is formed in a stress concentration position of a roadway body, so that the early effect of stress pressure on a supporting body is relieved, and the effect of protecting a first-level supporting structure is achieved; meanwhile, a surrounding rock compact structure is loosened, so that surrounding rock cracks are expanded, a grouting channel is unobstructed, the grouting effect is improved, and the effect of solidifying surrounding rock is improved; the pressure relief groove is excavated, so that the original stress of the shallow part of the surrounding rock is reduced, pressure stabilizing and cementing are facilitated, the pressure of grouting and cementing of the shallow part of the surrounding rock is improved, and the effect of relieving the stress difference of the surrounding rock of a deep well roadway is achieved; the pressure relief groove is filled with a pressure relief concrete layer to achieve a strong bottom angle, so that the key effect of preventing the two sides from being damaged firstly to cause instability of the whole support is achieved; and meanwhile, a filling hole is formed in the inner bottom of the pressure relief groove, so that the contact area between the roadway body and the pressure relief concrete layer is increased, and then the falling of the concrete layer is relieved.

Description

technical field [0001] The invention relates to the field of roadway support, in particular to the field of a support method and equipment for preventing the strong damage of the roadway support and the overpassing of surrounding rocks. Background technique [0002] As we all know, all motion and energy conversion in nature follow the laws of physics, and there is a basic law that tends to balance the system. For the surrounding rock of the roadway, before the roadway is not excavated, the stress state of the surrounding rock is the initial stress state, and all directions The stress remains relatively balanced and is in a steady state. When the roadway is excavated, the stress balance state is broken, the surrounding rock enters the secondary stress state, the stress difference between the shallow surrounding rock and the deep rock mass increases, and the deep surrounding rock is in a higher energy state (high stress). Transfer to the shallow surrounding rock (low stress s...

AI Technical Summary

Problems solved by technology

When the roadway is excavated, the stress balance state is broken, the surrounding rock enters the secondary stress state, the stress difference between the shallow surrounding rock and the deep rock mass increases, and the deep surrounding rock is in a relatively high energy state (high stress). Transfer to the shallow surrounding rock (low stress state) in order to reach a new balance point. At this time, if the support strength of the roadway is greater than the high stress brought by the deep surrounding rock, the high stress will be transferred to the deep after being blocked; If the support strength of the roadway is not enough, or there are weak links, the accumulated high stress will choose the weak place to break through, causing the roadway to shrink and deform or even collapse to release the deformation energy. Under the condition of relatively hard and brittle coal and rock mass, the pressure When the difference is large, the energy is released suddenly in a short period of time, causing the roadway to collapse suddenly, and coal and rock blocks to be thrown out of the grid, resulting in the occurrence of rock burst disasters. In the existing technology, this problem cannot be solved. For this reason, it is necessary for us to propose a support method and equipment to prevent the roadway support from being strongly damaged and the surrounding rock from crossing over.

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