An anchor cable wall type reinforcement device and method for narrow coal pillars

Abstract

The invention discloses a narrow coal pillar anchor cable wall type reinforcing device and method. The device comprises an anchor cable supporting system, an anchor cable anti-shearing system and a roadway top surface lining system; the anchor cable supporting system comprises an anchor cable, an anchor cable tray and an anchor cable lock; and the anchor cable anti-shearing system comprises an anchor cable sleeve and grouting concrete. The roadway top surface lining system comprises a steel fiber concrete wall and a matched iron plate box mold. The anchor cable anti-shearing system is composedof the anchor cable sleeve and the grouting concrete; the roadway top surface lining system is composed of the steel fiber concrete wall and the matched iron plate box mold; and the matched iron plate box die is formed by welding steel plates with the thickness of 0.5 cm. According to the reinforcing device, the design is reasonable, the support strength is high, the support key is prominent, theoperation process is simple, the shear stress on the interior of a coal pillar can be effectively resisted, a coal body of the narrow coal pillar can be subjected to grouting modification, the position displacement of the narrow coal pillar is restrained, and the stability of the narrow coal pillar is increased.

Description

technical field [0001] The invention relates to the technical field of roadway coal pillar support, in particular to a narrow coal pillar anchor cable wall reinforcement device and method. Background technique [0002] In underground coal mining, in order to ensure the transportation and ventilation requirements of the working face, a section coal pillar with a certain width must be reserved between two adjacent working faces. In order to effectively save coal resources, the size of section coal pillars must be reduced on the premise of ensuring safe and efficient mining. Especially in the gob-side entry or gob-side entry retaining operation, the narrow coal pillar is an extremely important "support body". The width of the narrow coal pillar is 4-8m. Under the influence of the advanced bearing pressure of the adjacent mining face and the self-weight of the overlying strata, the principal stress becomes inclined, and the coal pillar is mainly shear failure and instability, w...

AI Technical Summary

Problems solved by technology

The width of the narrow coal pillar is 4-8m. Under the influence of the advanced bearing pressure of the adjacent mining face and the self-weight of the overlying strata, the principal stress becomes inclined, and the coal pillar is mainly shear failure and instability, which makes the surrounding rock of the roadway very easy to lose. stability, seriously affecting the safety of mine recovery

The existing narrow coal pillar support methods are limited to a single anchor cable or bolt support or blindly modify the coal pillar by grouting to increase the strength of the coal body, the internal stress distribution of the narrow coal pillar is unclear, and the roadway surface is insufficiently controlled , the Lane gang is serious

The above phenomena have seriously affected the stability of the narrow coal pillar roadway and threatened the safe production of the mine

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