Since 1987, nearly 60 shaft wall fractures were taken place in Xu-Huai mining area. Many researches are done about the mechanism of shaft wall fractures. And, the past research shows that the vertical additional force due to the loss of bottom aquifer is the main factor that results in shaft wall fracture. On the other hand, more researches about thermal stress are done in many fields, but only few are reported about shaft wall structure. One report reveals that thermal stress is the main controlling factor...
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