Increased hanging area and weighting of main roof caused abutmentstress concentration and stress transfer.
由于悬露面积增大或老顶来压引起支承压力集中和转移。
2
The results show that the abutment pressure distribution on coal pillar is the direct reflection of abutmentstress induced by mining on the interfaces of coal seam and immediate roof.
The floor roadway should be located out of the abutmentstress zone when protection coal pillar is retained, or the working face should be pushed away for enough distance under overhead mining.