Construction Technology and Support Technology of Tunneling Roadway Through Igneous Rock Intrusion Area
When the 15104 return airway of Huiyang Coal Mine in Yangcheng passes through the igne-ous rock intrusion area,the coal body is seriously broken,the reservation of the coal wall and the two coal pillars is difficult,and the failure rate of the surrounding rock support is high.In view of these technical problems,the mechanism of coal body crushing is analyzed from the aspects of surrounding rock stress,coal seam occurrence and support strength.According to the current situation of tunneling,the tunneling process and support technology are optimized.The construction technology of deep hole pre-splitting blasting and the combined support technology of'shallow deep hole grouting+yielding anchor shed+U29 steel shed'are put forward.The application results show that after the optimization of the excavation technology and support technology in the igneous rock area,the difficulty of the roadheader passing through the igneous rock is re-duced,the equipment failure rate is reduced to less than 5%,and the equipment maintenance cost is re-duced by 278,000 yuan.At the same time,the phenomenon of coal crushing and caving has been obviously controlled,the roof subsidence has been reduced to 0.14 m,the caving length of the end coal pillar has been reduced to 1.2 m,and the empty roof distance has been reduced to below 0.8 m,which has achieved remarkable application results.
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维普
