Deep three-soft coal seam asymmetric tunnel supporting structure

Abstract

The invention discloses a deep three-soft coal seam asymmetric tunnel supporting structure comprising a tunnel top support, a roadside support, and a tunnel bottom support; the tunnel top support comprises a metal net used for supporting the tunnel top, and top steel bar ladder beams, top anchor poles and top anchor cables used for reinforcing the tunnel top,; the roadside support comprises a high side support and a low side support, each of which comprises an electric welding plain net used for supporting the roadside, and side steel bar ladder beams and side anchor poles used for reinforcing the tunnel roadside; the high side support also comprises side cables; the tunnel bottom support comprises base angle anchor poles vertically and symmetrically arranged along the tunnel, wherein the base angle anchor poles are arranged on two side base angles formed by the tunnel bottom and the roadside, and the angle of depression is 45 degrees. The anchor-beam-net-cable combined support mode is employed; the anchor poles, anchor cables and steel bar ladder beams of the tunnel top and roadside can improve tunnel surrounding rocks stress states; the side cables are arranged so as to reinforce tunnel high side local support; the base angle anchor poles are arranged so as to effectively control the tunnel bottom heaves.

Description

technical field [0001] The invention relates to an asymmetric roadway support structure, in particular to an asymmetric roadway support structure in deep three soft coal seams. Background technique [0002] my country is a large coal-producing country, and coal is the main energy source in our country with abundant reserves. The Twelfth Five-Year Plan pointed out that until 2015, the proportion of coal in my country's energy consumption will still account for about 63%. It is difficult to change the coal-based energy structure. Since the founding of New China nearly 70 years ago, China's energy supply and consumption capacity has changed from weak to strong, and China has become the world's largest energy producer and second largest energy consumer. In recent years, the scale, output and depth of coal mining in the central and eastern regions of my country have been increasing year by year, and shallow coal resources have become less and less. In order to meet the urgent de...

AI Technical Summary

Problems solved by technology

The above-mentioned support methods have their own advantages and disadvantages, but up to now, the roadway support in deep three-soft coal seams still has technical problems such as high support cost, large maintenance amount, poor support effect, and insufficient support theory and methods.

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