Funding for this research was provided by:
National Natural Science Foundation of China (51108397)
Natural Science Foundation of Hunan Province, China (2015JJ2136)
Key Project of Hunan Provincial Education Department, China (19A477)
Hunan Key Laboratory of Geomechanics and Engineering Safety, China (16GES04)
Article History
Received: 16 May 2019
Accepted: 20 July 2020
First Online: 30 July 2020