Increased hanging area and weighting of main roof caused abutment stress 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 treatment of the soft foundation under the culvert and channels and in a certain area behind of abutment adopted CFG piles.
位于软基路段桥台背一定范围内，涵洞、通道基底的软基，采用预压反开槽后复合地基粉煤灰碎石桩加固处理。
3
Field practice shows that the method of making loose blasting deeply in the area of the mining abutment pressure can control the entry floor heave effectively and meet the need of the production.