Large plate bottom supporting method for soft rock roadway

Abstract

The invention discloses a large plate bottom supporting method for a soft rock roadway. The large plate bottom supporting method includes the following specific steps that high-speed spraying concrete is adopted on side tops and two sides, four concrete spraying layers are formed, four layers of steel wire ropes and four layers of anchor rods are arranged in the four concrete spraying layers to form a tough sealing layer and construct a homogeneous and isotropic supporting ring body, initiative supporting is conducted on the roadway, a thin reinforcing mesh is arranged between the second spraying layer and the third spraying layer, the steel wire ropes and the thin reinforcing mesh are used together, concrete foundations are poured on two side bottoms of the roadway, a ditch is formed in the inner side of the right foundation, and a pressure releasing groove is excavated in the lower portion of a bottom plate of the roadway. The large plate bottom supporting method is more stable and more durable than traditional supporting, and a large amount of supporting cost is also reduced.

Description

technical field [0001] The invention relates to the field of roadway support, in particular to a method for supporting the bottom of a large plate in a soft rock roadway. Background technique [0002] With the expansion of the coal mine mining area, the mining depth continues to increase, and the mining conditions become more and more difficult, especially the superimposed pressure brought by the self-expansion of the weak rock and coal body under the mining stress, which has been brought about by the large buried depth, complex structure and mining stress. It is a problem that plagues coal mine roadway support. Because these pressures have differences in time speed, force magnitude and direction, they are not isochronous and uneven superimposed pressure combinations. Under the action of this uneven superimposed pressure, the roadway support will be repeatedly damaged. Under the joint action of horizontal stress and vertical stress from the rock mass, the roadway often bul...

AI Technical Summary

Problems solved by technology

The roadway is affected by the horizontal stress and vertical stress from the rock mass, and the bottom plate and the two sides often bulge seriously, and even cause the whole roadway to collapse, which seriously affects the safe production of the coal mine. For the roadway under such complex stress, conventional It is difficult to ensure the stability of the roadway with advanced support technology

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