1. School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou 221116, China; State Key Laboratory for Geomechanics and Deep Underground Engineering, China Univ. of Mining and Technology Xuzhou 221116, China.
2. School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou 221116, China; State Key Laboratory for Geomechanics and Deep Underground Engineering, China Univ. of Mining and Technology, Xuzhou 221116, China (corresponding author).
3. School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou 221116, China.
4. School of Mechanics and Civil Engineering, China Univ. of Mining and Technology, Xuzhou 221116, China; State Key Laboratory for Geomechanics and Deep Underground Engineering, China Univ. of Mining and Technology, Xuzhou 221116, China.