Study on Failure Characteristics of Hard Roof in High Mining Face of Dongqu Coal Mine
In the mining process of fully mechanized caving face,with the advancing of the working face,the roof structure of the roadway is easy to form a suspended roof structure,which causes hidden dangers such as gas accumulation and large area roof collapse.In order to master the failure characteristics of the hard roof in the working face with large mining height,the ultimate failure depth and ultimate fracture distance of the suspended roof structure with large mining height are described and analyzed comprehensively by the methods of field observation,numerical simulation and theoretical analysis.The results show that when the failure depth of the roadway roof exceeds 5.25 m or the distance of the suspended roof exceeds 13.55 m,the roadway roof will collapse under the weight of the rock mass in the crushing zone.
hard roofsuspended roof structurefailure characteristic
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