Causation Analysis of Roof Cutting and Support Crushing in Shallow-buried Large Mining Height Long Wall Working Face of western China

摘要

During the mining process of shallow buried long wall working face, the breaking of main roof easily result in fracture belt's connectivity with the surface. The paper has studied the causation of roof cutting and support crushing in shallow-buried large mining height long wall working face of Suancigou coal mine which is in Ordos Inner Mongolia. The main reasons are as follow, poor effect of forced roof caving; unreasonable structure type of support; lower setting load; unevenly stressing between front and rear columns; low advancing speed or the working face. So in order to avoid the fully mechanized supports crushing accident, the working face advancing speed should be accelerated during the period of the pressure change of working face.