1. The State Key Laboratory for Geomechanics and Deep Underground Engineering, and School of Mechanics and Civil EngineeringChina University of Mining and Technology Xuzhou 221116 China
2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of EducationTongji University Shanghai 200092 China
3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil MechanicsChinese Academy of Sciences Wuhan 430071 China