Method for reinforcing working surface of loose and soft coal bed by utilizing nonmetal grouting anchor cable

Abstract

The invention discloses a method for reinforcing a working surface of a loose and soft coal bed by utilizing a nonmetal grouting anchor cable. The grouting anchor cable is made of a high-strength composite material carbon fiber/glass fiber. The reinforcement of the working surface of the loose and soft coal bed is realized through the processes of surveying and lofting, drilling holes in a coal body, manufacturing and arranging the grouting anchor cable, sealing an anchor cable hole, and grouting chemical grout in the hole and the like. As the grouting anchor cable is made of nonmetal materials, no sparks are generated when a coal-winning machine cuts, and the grouting anchor cable has the characteristics of flame retardancy, anti-static electricity, safety and reliability in use and hightensile strength, higher breaking force, light weight, and capability of being bent and coiled, and is higher than steel and convenient in transportation; and by utilizing the method, deep hole reinforcement and support on the working face can be carried out under the condition that the coal face can not be supported by using a metal anchor cable, the grouting support operation can be carried outon the working surface on site by combining a chemical grouting method, and the coal body of the working surface can be reinforced at the upper and lower tunnels of the working face by combining the chemical grouting in advance.

Description

technical field [0001] The invention relates to a method for reinforcing the working face of a soft coal seam with a grouting anchor cable in a mine, in particular to a method for using a non-metallic grouting anchor cable to advance the coal mining face in the mining process under the condition of soft and broken surrounding rock. method of reinforcement. Background technique [0002] At present, as the shallow coal resources are decreasing day by day, the deep mining of the resources has been carried out one after another. Due to the increase of the mining depth and ground stress, more and more coal mine working faces are in the state of soft and broken surrounding rocks, and the working faces are easily damaged during the mining process. There are slabs and roof caving, and even stop production at the working face. According to statistics, the stoppage time of the working face due to the coal wall slab or roof caving can reach 40% to 60% of the total production stop time....

AI Technical Summary

Problems solved by technology

At present, the method of chemical grouting combined with metal bolt support in the hydraulic support of the working face is often used in China to solve the problem of roof caving on the working face, but this method is costly and has a small control range. It is inevitable to encounter metal anchors, which are prone to sparks and explosions, causing safety hazards. In addition, because metal anchors or anchor cables have high shear strength, it is easy to damage the shearer pick

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