Study On Protection Scope Of Inclined Under-Protective Layer With Pseudo-Incline Technique For Xing Long Coal Mine

Xing long coal mine inclined to dip oblique protective layer mining engineering practice as the background, using laboratory experiments and numerical simulation methods to inspect research tilt range overlooking the protective layer is under the protection of the protective layer mining conditions Oblique delineation method. Through the scope of different methods delineated comparative analysis of the research results are as follows:(1)Experimental determination of mechanical properties by performing Xinglong Coal Seam # 6 face with protective layer of rock, had measured 6 # seam face surrounding rock mechanical parameters.(2)4 seam is performed by a protective layer to inspect the scope of the experiment, obtained under 4 seam along the border tends to efficient relief angle of 67.6 °, the tendency on the boundary of the effective relief angle of 91.4 °.(3)Through the establishment of multi-field coupling model of the protective layer of gas in the mining process flow, the use of COMSOL Multiphysics multiphysics software to solve the model, and according to the residual gas pressure criterion(residual gas pressure P <0.74MPa) delineated # 4 the tendency efficient relief angle seam along the border is 92.7 °, along the border tends to lower the effective relief angle of 70.1 °, along strike effective relief angle of 62.1 °; at the same time, according to the deformation criterion(seam normal expansion and deformation effective relief angle ?3 ‰) delineated # 4 seam along the border tends to be 90.3 °, effective relief angle along the border tends to be 68.5 °, along strike effective relief angle is 59.3 °.(4)The results are delineated by different methods and reference "coal and gas outburst prevention regulations," the results were compared designated a comprehensive analysis to determine the effective relief angle range is booming coal mining coal mine after 6 # 4 # seam along strike is 59.3 ° ~ 62.1 °, effective relief angle range Xinglong Coal seam Face 6 # 4 # seam mining under after tendency along the border is 67.6 ° ~ 70.1 °, effectively discharge the booming coal mining coal mine after 6 # 4 # seam along the border tends pressure angle range is 90.3 ° ~ 92.7 °.