Research Of The Adjacent Seams Gas Extraction Rules During Roof Periodic Pressure

Method of numerical simulation combining with actual measured data is used in this thesis, which solves problem of adjacent layer gas extraction during roof periodic pressure of Ma Junyu. The law of Adjacent layer gas extraction during roof periodic pressure is researched, by determining mine gas parameters to understand gas occurrence conditions comprehensively. Through the oretical analysis of adjacent layer gas pressure relief mechanism and rule and Fluent simulation software is used to simulate gas concentration during roof pressure of working face, the influence of roof pressure on adjacent layers gas emission is analyzed. Through combination with engineering practice of Ma Junyu mine, parallel high drilling tendency to adjacent layer gas extraction is used, and extraction process parameters is optimized, from aspects of improving effect of adjacent layer gas extraction for working face and decreasing gas emission in process of mining as far as possible. At the same time, extraction effect is analyzed. Rule of gas emission for drilling extraction adjacent layer during roof periodic pressure is researched. Gas emission and extraction time is increased significantly. That's cyclical fluctuation between gas extraction quantity and extraction time, and interval of roof periodic pressure has good correlation with gas extraction quantity. So it should be considered the influence of pressure interval when borehole parameters are arranged.