Determination of the deformation stage of a fully mechanized caving face in the surrounding rock of mining roadway
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Abstract:
To analyze the deformation characteristics of the mining roadway located in front of the fully mechanized top-coal caving face, we researched the j7401 fully mechanized top-coal caving face of the Helin Coal Mine with theoretical analysis and field measurement. According to the distribution curve of the advanced abutment pressure, three deformation stages of the roadway ahead of the working face are defined, which are the quick deformation stage, the deceleration deformation stage, and the stable deformation stage. The cut-off point of quick deformation stage and deceleration stage is the intersection of advanced abutment pressure and the original rock stress. The cut-off point of the deceleration deformation stage and stable deformation stage is the peak of the advanced abutment pressure. In this work, the advanced abutment pressure and roadway deformation of j7401 working face in mining were observed respectively, and the observation data was analyzed by the method of least squares fitting. The deformation of the roadway surrounding rock was partitioned based on the advanced abutment pressure observation data:the cut-off point of quick deformation stage and deceleration stage was 8.1 m ahead of the working face, and the cut-off point of deceleration deformation phase and stable stage was 19.8 m ahead of the working face. The deformation was also partitioned based on the roadway deformation observation data, in which way the cut-off point of quick deformation stage and deceleration stage was 8.9 m in front of the working face, and the cut-off point of deceleration deformation phase and stable stage was 20.1 m ahead of the working face. The deviations of the two classification methods were respectively 0.8 m and 0.3 m, indicating the method to partition the roadway surrounding rock deformation stage based on the advanced abutment pressure observation data is feasible and the precision is high.
