Funding for this research was provided by:
National Natural Science Foundation of China (51108397)
Natural Science Foundation of Hunan Province (2015JJ2136)
Scientific Research Project of the Education Department of Hunan Province, China (16B255)
Key Laboratory of Geomechanics and Engineering Safety, China (16GES04)
Article History
Received: 27 January 2018
Accepted: 29 December 2018
First Online: 17 January 2019