1. Key Laboratory of High-Speed Railway Engineering (MOE), School of Civil Engineering, Southwest Jiaotong University, Chengdu, China
2. Guangxi Communications Investment Group Co., Ltd, Nanning, China
3. School of Civil Engineering, Sichuan Agricultural University, Dujiangyan, China
4. Chengdu Surveying Geotechnical Research Institute Co., Ltd., of MCC, Chengdu, China