Based on the important role in mine safety played by parameters of the first gas outburst, we propose a method of combining historic data, theoretical analysis and experimental research for the purpose of critical val...Based on the important role in mine safety played by parameters of the first gas outburst, we propose a method of combining historic data, theoretical analysis and experimental research for the purpose of critical values of gas parameters of the first gas outburst in a coal seam of the Xieqiao Mine. According to a characteristic analysis and a summary of the rules of coal and gas outbursts in the No.8 coal seam of a Huainan mine, we have investigated their effect on coal and gas outbursts in terms such as ground stress, gas, and coal structure. We have selected gas parameters and determined the critical values of each of the following indices: gas content as 7.7 m 3 /t, tectonic coal as 0.8 m thick, the absolute gas emission as 2 m 3 /min, the rate of change as 0.7 m 3 /min, the gas desorption index of a drilling chip K 1 as 0.26 mL/(g min 1/2 ) and the values of desorption indexes 4h 2 as 200 Pa. From a verification of the production, the results indicate that application of each index and their critical values significantly improve the level of safety in the production process, relieve the burden upon the mine, save much labor and bring clear economic benefits.展开更多
Numerical simulation-FLAC^(3D) and equivalent material simulation were carried out to analyze the damaged patterns and lows, distribution of plastic width of face, and surrounding rock of FMTC during the advance of wo...Numerical simulation-FLAC^(3D) and equivalent material simulation were carried out to analyze the damaged patterns and lows, distribution of plastic width of face, and surrounding rock of FMTC during the advance of work face with different thick coal seams based on engineering geology and exploitation technology of 1151(3) fully mechanized top-coal caving (FMTC) face in Xieqiao Colliery.The results show that there is damage,and the destruction characteristics of surrounding rock and coal mass are different obviously in asymmetric exploitation layout.The damaged zone in surrounding rock and the coal of the return airway is larger than that of the intake airway.Moreover, the retained coal pillars are all damaged by tension and shear fracture, and plastic zone in coal mass in the dip direction ahead of Face is nonuniform.There are large damage zones in roof and floor strata, surrounding rock, and coal of return and intake airways near work face.The damaged zone in the upper part of Face is larger than that in middle and lower parts.The fruits of this paper are of guiding significance for engineering practices, such as support design and choice, roadway supporting and maintaining, rock pressure control of FMTC face, etc.展开更多
基金supported by the National Key Basic Research Program of China (No.2005CB 221501)the Innovation Scientists and Technicians Troop Construction Projects of Henan Province (No.084200510002)the Program for New Century Excellent Talents in University (No.NCET-07-0257)
文摘Based on the important role in mine safety played by parameters of the first gas outburst, we propose a method of combining historic data, theoretical analysis and experimental research for the purpose of critical values of gas parameters of the first gas outburst in a coal seam of the Xieqiao Mine. According to a characteristic analysis and a summary of the rules of coal and gas outbursts in the No.8 coal seam of a Huainan mine, we have investigated their effect on coal and gas outbursts in terms such as ground stress, gas, and coal structure. We have selected gas parameters and determined the critical values of each of the following indices: gas content as 7.7 m 3 /t, tectonic coal as 0.8 m thick, the absolute gas emission as 2 m 3 /min, the rate of change as 0.7 m 3 /min, the gas desorption index of a drilling chip K 1 as 0.26 mL/(g min 1/2 ) and the values of desorption indexes 4h 2 as 200 Pa. From a verification of the production, the results indicate that application of each index and their critical values significantly improve the level of safety in the production process, relieve the burden upon the mine, save much labor and bring clear economic benefits.
基金Supported by the National Basic Research Program (2010CB226806)the National Science and Technology Supporting Program Key Item(2008BAB36B01)the Funded Project of Anhui University of Science and Technology Academic Outstanding Innovation Team
文摘Numerical simulation-FLAC^(3D) and equivalent material simulation were carried out to analyze the damaged patterns and lows, distribution of plastic width of face, and surrounding rock of FMTC during the advance of work face with different thick coal seams based on engineering geology and exploitation technology of 1151(3) fully mechanized top-coal caving (FMTC) face in Xieqiao Colliery.The results show that there is damage,and the destruction characteristics of surrounding rock and coal mass are different obviously in asymmetric exploitation layout.The damaged zone in surrounding rock and the coal of the return airway is larger than that of the intake airway.Moreover, the retained coal pillars are all damaged by tension and shear fracture, and plastic zone in coal mass in the dip direction ahead of Face is nonuniform.There are large damage zones in roof and floor strata, surrounding rock, and coal of return and intake airways near work face.The damaged zone in the upper part of Face is larger than that in middle and lower parts.The fruits of this paper are of guiding significance for engineering practices, such as support design and choice, roadway supporting and maintaining, rock pressure control of FMTC face, etc.
