Strip filling mining technology under complex geological conditions with multi-faults
In order to optimize the mining layout and improve the recovery rate of the coal seam under complex geological conditions with multi-faults in Shaliang Coal Mine,it was proposed to arrange short-wall or special-shaped strip filling mining working face in the multi-fault cutting area of the first level and carry out multi-cycle filling mining to replace coal pillars.The results show that,the base load ratio JZ<0.8,the base mining ratio JC<9,the strip mining width is less than the limit span determined by the immediate roof breaking criterion in the test C135206 working face.It is suitable to adopt the three times benchmark parameters of"mining 6.6 m and leaving 19.8 m"four rounds of sequential mining and filling using continuous miner.The roof connection method of laying multi-channel gas guide pipe and grouting pipe at the top of the working face strip roadway can ensure that the filling body is fully connected to the roof,and the block wall helps to stabilize the walls at both ends of the strip roadway.The research provides a new idea for optimizing the horizontal mining layout and improving the recovery rate.
fracture structurefilling miningtriple benchmarkmining-filling processroofing process
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