Constitutive model of scale effects in uniaxial compression for gas-saturated coal
Gas coal has also scale-dependent mechanical properties like many other rock materials. It becomes significant to select its mechanics parameters for determining critical conditions of coal and gas outburst and other application in fields such as the underground excavation design of room and pillar. Based on the Weibull theory, a scale constitutive model in uniaxial compression for gas-saturated coal is raised. The scale-dependent variation of ultimate compression strength under different gas pressure is specifically studied. We discuss the effects of interfacial friction during testing and modify our model according to the testing results. Results show that, the ultimate compression strength of coal samples decreases as gas pressure and the ratio of height to diameter increase. The differences between theoretical and experimental results for ultimate compression strength mainly depend on the interfacial friction. The model reasonably agrees with the testing results after modifying, and it can reflect the law of changeable uniaxial compressive strength with the coal sample size and describe almost the whole process of uniaxial loading.
Gas-saturated coal scale effect uniaxial compression gas pressure interfacial friction
Song Liang Liu Weiqun Jin Cuijun Liang Haonan
School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangs Xuzhou Construction Machinery Group, CO., LTD, Xuzhou, Jiangsu, China
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
122-128
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）