Funding for this research was provided by:
the national natural science foundation of china (42007251)
the national key research and development plan (2018YFC1504703)
the shaanxi key laboratory of loess mechanics and engineering (LME201803)
the china postdoctoral science foundation (2019M653883XB)
the education department of shaanxi provincial government (18JK0785)
Article History
Received: 27 June 2021
Accepted: 24 October 2021
First Online: 4 November 2021