Funding for this research was provided by:
State Key Laboratory for GeoMechanics and Deep Underground Engineering (SKLGDUEK1802)
International Mobility Fund from the University of Leeds
National Natural Science Foundation of China (51908546)
Natural Science Foundation of Jiangsu Province (BK20170279)
‘Taishan’ Scholar Program of Shandong Province (tsqn201909016)
‘Qilu’ Scholar Program of Shandong University
Article History
Received: 10 November 2019
Accepted: 22 May 2020
First Online: 4 June 2020