Research on the strata pressure behaviors of full seam mined coal seam with rigid roof

Ever widely used,large mining height fully mechanized mining technique is an important way for mining of thick coal seam.Rock burst accidents account for a large portion of mine accidents.Hence,it is a serious concern to effectively understand rock burst law and adopt reasonable production technology in mining practice.The mining field of large mining height fully-mechanized mining face features large roof span,big height,complicated mine pressure,peculiar pressure behavior and complex management difficulties.With respect to the hard roof peculiarities of the large mining height fully mechanized face in # 9 and #10 coal seam of ** Coal Mine,beginning with the theoretical analysis,similarity simulation experiment research was conducted,and the experimental data were analyzed.The law of strata pressure behaviors in large mining height workface on rigid roof conditions was revealed.It showed that,for large mining height face with similar geological conditions,roof caving tends to result in dynamic impact,roof damages are mainly pulled breaking and sheared break,maximum pressure value occurs in the middle front of the face,and the influence of water gathering in goaf and surface subsidence need further demonstration by other approaches.As a result,and safety technique and control measures for the face with similar surrounding rocks are proposed.