[1] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
[2] Key Lab. for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400044, China
[3] Natural Gas Branch Company, China Petroleum Chemical Industry Co., Ltd., Beijing 100120, China