Roadway roof supporting method of coal seam roof, soft rock roof or composite roof and for coal mine deep mining

Abstract

The invention discloses a roadway roof supporting method of a coal seam roof, a soft rock roof or a composite roof and for coal mine deep mining. The roadway roof supporting method comprises step 1, performing extension anchoring on coal walls through an extended anchor rod, wherein the coal walls are arranged on the bilateral sides of a roadway respectively; step 2, performing composite supporting on a shoulder roof through a shear resistance anchor rod and a shear resistance anchor cable and simultaneously locking a shoulder soft rock roof or a fracture development roof through the anchoring force in the shear resistance anchor rod and the shear resistance anchor cable, wherein the shoulder roof is close to the coal walls which are arranged on the bilateral sides of the roadway respectively; step 3, anchoring the coal seam roof, the soft rock roof or the composite roof on a hard roof through a high strength anchor cable in the middle of the roadway so as to reduce the bending degree and prevent the bending failure. According to the roadway roof supporting method of the coal seam roof, the soft rock roof or the composite roof and for the coal mine deep mining, the different properties of anchor rods are used according to deformation characteristic of different positions of the roadway, the construction is simple and convenient, the construction speed is high, the efficiency is high, the control effect on the soft rock roof, the composite roof and a broken roof during deep mining is good, the bearing capacity of a supporting structure is large, and the repair rate of the roadway is low.

Description

technical field [0001] The invention relates to the field of coal mine roadway support, in particular to a roadway roof support method for coal seam roofs, soft rock roofs and broken composite roofs during deep mining of coal mines. Background technique [0002] The existing coal mine generally adopts the supporting method of anchor rod, anchor cable and metal mesh to support the roof of the roadway. The principles used by these methods are mainly to suspend the detached rock blocks that have been separated from the roof of the parent body with anchor rods and anchor cables to prevent excessive deformation of the rock formations on the surface of the roadway. The shortcoming of this support method is that there is no way to solve the problem of excessive shear stress between layers in coal seam roof, soft rock roof and broken composite roof. The rapid increase will quickly cut the anchor rods and anchor cables with low shear resistance, which will cause the roadway to becom...

AI Technical Summary

Problems solved by technology

The shortcoming of this support method is that there is no way to solve the problem of excessive shear stress between layers in coal seam roof, soft rock roof and broken composite roof. The rapid increase will quickly cut the anchor rods and anchor cables with low shear resistance, which will cause the roadway to become unstable; after the roof rock layer stiffness is small to a certain extent, the roof deflection is also difficult to control, resulting in a large number of tensile fractures in the roof Gaps, and eventually the supporting structure loses its supporting function

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