Method for monitoring rock burst risk of soft coal roadway posterior
A kind of shock ground pressure, dangerous technology, applied in the direction of surface mining, earthwork drilling, underground mining, etc., to achieve the effect of large contact area
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[0018] like figure 1 , figure 2 As shown, the steps of the method for monitoring the risk of rock burst in the back road of soft coal seam roadway of the present invention are as follows:
[0019] 1. Determine the dangerous area behind the roadway
[0020] In soft coal seam roadway excavation, for the roadway back road 1 where there is rock burst appearance area, the high stress area 2 of the roadway is divided by analogy, analysis and judgment of the characteristics of rock burst appearance in the adjacent stope.
[0021] 2. Drilling and installing monitoring anchor cables
[0022] Drill an anchor cable hole 3 every interval a=30-60m in the high-stress area 2 of the roadway, the depth of the hole is b=10m or more, and the distance from the bottom plate is 1.5-2.0m, and then install the anchor cable 4 in the anchor cable eye. When installing, the anchor cable 4 is outside The end should be put on the W-shaped steel strip 5 with a rigid side length greater than 40cm, then p...
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