1. State Key Laboratory of Mine Disaster Prevention and Control, Shandong Univ. of Science and Technology, CN (Corresponding author), e-mail: csjwyb@163.com
2. Centre for Geosciences Computing, School of Earth Sciences, the Univ. of Queensland, AU.
3. State Key Laboratory of Mine Disaster Prevention and Control, Shandong Univ. of Science and Technology, CN.
4. School of Mining Engineering, Heilongjiang Univ. of Science and Technology, CN.