Grouting Reinforcement Method for Broken Coal Mass in Working Face Return Air Roadway
A technology for grouting reinforcement and working face, applied in chemical instruments and methods, earthwork drilling, shaft equipment, etc., can solve the problems of poor roadway maintenance effect, high cost, low support resistance, etc. The effect of large knot strength and improved bearing capacity
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[0014] In order to enable those skilled in the art to better understand the present invention, the present invention will be further clearly and completely described below in conjunction with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
[0015] A grouting reinforcement method for broken coal in return air level roadway of working face, comprising:
[0016] Several rows of grouting holes with a row distance a of 1.8m are arranged on the cut coal side of the return air level roadway. c is 0.2m;
[0017] In each row of grouting holes, the hole elevation angle α of the uppermost grouting hole is 30°, and the vertical projection length d of the grouting hole is 1.9m; the hole elevation angle β of the middle grouting hole is 25° , and the horizontal projection length e of the grouting ...
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