Experimental study on permeability of coal sample subjected to triaxial stresses
The permeability of coal subjected to triaxial compression was investigated to relate it to the change of stresses state, analogous to mining-induced redistribution of stress in the surrounding rock. Results show that the permeability of coal sample under triaxial compression tends to decrease with the increase in stress in each loading direction, which indicates that permeability of the coal is actually controlled by the evolution of cracks in the coals. It also means that the orientation of cleats and maximum principle stress could significantly controls the permeability of intact coal. In other words, loading stress vertical to face cleats can be much easier to narrow the aperture of face cleats of the intact coal sample. Besides, the broken coal sample under higher stress level shows higher permeability than that of the intact coal under lower stress environment. That is partly because that the higher stress level is applied, the more likely the broken coal is to crush, which can contribute to the formation of the connected crack and in turns increase the permeability of coal.
permeability triaxial compression stress coal
Kaihua Zeng Jiaxiong, Xu Pengfei, He Chunguang Wang
Department of Civil Engineering, Nanchang Institute of Technology, Nanchang, 330099 Jiangxi, China School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083 Key Laboratory of Mine Disaster Prevention and Control Shandong University of Science and Technology
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
1166-1172
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）