Supporting system and method for forming mining area rectangular roadway roof combined rock beam

Abstract

The invention belongs to the technical field of coal mine roadway supporting, and discloses a supporting system and method for forming a mining area rectangular roadway roof combined rock beam. A mining area rectangular roadway is arranged along a coal seam roof, the roof is supported according to different roof rock stratum conditions, the supporting system and method for the roof combined rock beam are formed, the formed roof combined rock beam bears the load of the upper part of the roadway roof, and the mining area rectangular roadway roof is supported and stabilized. According to the supporting system and method for forming a mining area rectangular roadway roof combined rock beam, the supporting system and method for the roof combined rock beam are formed in a roadway roof rock stratum by combining specific roadway roof rock stratum conditions and utilizing the supporting effect of anchor rods and the like on the roof rock stratum; the formed roof combined rock beam utilizes the bearing principle and effect of a simply supported beam in the structure, so that a roadway roof rock stratum bears the load effect like a beam in the structure, and the stability of a roadway is ensured; the technical problem of roadway supporting can be solved, and roadway stability is guaranteed; and the supporting cost is not increased too much, the construction is simple, and the operation is easy.

Description

technical field [0001] The invention relates to the technical field of coal mine roadway support, in particular to a support system and method for forming a rectangular roadway roof composite rock beam in a mining area. Background technique [0002] At present, my country's coal mining has entered the deep part. In order to achieve rapid mining and reduce mining costs, a large number of rectangular roadways in mining areas arranged in coal seams are widely used, and the total amount has accounted for about 60-80% of coal mine support roadways. This kind of roadway is arranged along the roof of the roadway in the coal seam. After excavation and support, even if the two sides and the bottom plate are relatively stable, the roof of the rectangular roadway will still have a large area of ​​caving, and the roof of some roadways is relatively broken and sinks seriously; The roof of the roadway is obviously separated from the layer, resulting in damage to the roof of the roadway. ...

AI Technical Summary

Problems solved by technology

[0005] (2) The joints and fissures of the roof rock are relatively developed, and the friction between the two joint surfaces is greatly affected by geological structures such as faults and fold zones, which makes the roof rock easily broken. At the same time, the sandstone on the roof of the deep roadway is generally softened severely, and the mudstone is very easy to collapse solution, resulting in a decrease in the strength of the rock and a larger plastic zone

[0006] (3) There are often mudstone interlayers in the roof rock layer of the roadway in the mining area, which makes it displace outward under the action of supporting pressure, resulting in the sinking of the roof

[0007] (4) The integrity of the layered rock strata on the roof is poor, and the stiffness of each layer is small. Under the action of the upper pressure, each layer is independently stressed and deformed, resulting in low flexural bearing capacity and large deformation of the entire roadway roof.

[0008] (5) The existing technology has insufficient support depth and support strength, or the roof support system and method formed by the support are unreasonable, but the support depth and strength cannot be increased regardless of the cost, and the roof support system formed by the support Can not effectively play the stability of the surrounding rock itself, can not improve the stability of the roof of the roadway and other problems

For example, the roadway roof support technology is too complicated and requires a large investment. Although it can ensure the stability of the roadway, the overall service life of this type of roadway is relatively short. If the cost is too high, it is very unreasonable economically.

Images