Support method and support structure for soft coal/ rock stratum alley

Abstract

The invention discloses a support method and a support structure for a soft coal / rock stratum alley and relates to the technical field of coal stratum alley support. The support method and the support structure for the soft coal / rock stratum alley aim at solving the problem that the soft coal / rock stratum alley is easy to deform. The support method for the soft coal / rock stratum alley comprises the steps: holes are drilled in edges of the soft coal / rock stratum alley; grout is directionally controlled at the bottom of each drilled hole so that grout reinforcing groups are formed; and an anchor cable is arranged in each drilled hole and a cable body end portion of each anchor cable is anchored on each grout reinforcing group. According to the support structure for the soft coal / rock stratum alley, the cable body end portion of each anchor cable is anchored on each grout reinforcing group. The support method and the support structure are suitable for alley support and particularly suitable for the alley support of soft coal / rock strata.

Description

technical field [0001] The invention relates to the technical field of coal / rock layer roadway support, in particular to a soft coal / rock layer roadway support method and a support structure. Background technique [0002] Coal mine roadway support technology is a key technology in mine construction and coal mining. Safe, reasonable and effective roadway support is a necessary condition to ensure high mine production and high efficiency. The bolt support method has many characteristics such as good support effect, high efficiency, and low cost. It has been widely used in coal mining enterprises in my country, and has brought huge technical and economic benefits to the enterprise. The bolt support has become a roadway support. main technical means. [0003] Compared with the anchor rod, the anchor cable has the characteristics of large depth, high strength and large pre-tightening force. The anchor cable should closely follow the excavation face and provide timely support. f...

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that the application of the existing anchor cable support method to the support of soft coal / rock formation roadway is prone to the following problems: because the head of the anchor cable is fixed at the bottom of the hole by a resin anchoring agent, The anchor point is small, and the anchoring force is not strong; in addition, the coal seam is soft, and after a period of time, the pre-tightening force of the anchor cable tends to decrease, and the pull-out force of the anchor cable on the roadway wall decreases accordingly, which will cause the roadway wall to Convex deformation in the roadway, such as figure 2 shown by the dotted line in

Images