1. Gansu Provincial Highway Aviation Tourism Investment Group Co., Ltd., Lanzhou 741000, China
2. Gansu Province Transportation Planning, Survey and Desing Institute Co., Ltd., Lanzhou 730000, China
3. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
4. School of Civil Engineering, Northwest Minzu University, Lanzhou 730030, China