Funding for this research was provided by:
the National Science Foundation for Young Scientists of China (51809264)
Fundamental Research Funds for the Central Universities (2017QL04)
the State Key Laboratory of Geo-Hazard Prevention and Geo-environmental Protection of Chengdu University of Technology (SKLGP2018K024)
Article History
Received: 11 December 2018
Accepted: 24 January 2020
First Online: 5 February 2020
Competing interests
: The authors declare that they have no competing interests.