[1] Technical University of Munich, Munich 81245, Germany
[2] China Railway Siyuan Survey and Design Group Co. Ltd., Wuhan, Hubei 430063, China
[3] China Petroleum East China Design Institute, Qingdao, Shandong 266071, China
[4] China Railway Eryuan Engineering Group Co. Ltd., Chengdu, Sichuan 610031, China
[5] Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China