Vol18 No.10: 2791-2802
【Title】Settlement patterns of mountainous half-filled and half-cut widened subgrade with retaining wall
【Author】FU Yong-guo1,2,3; JIANG Xin1,2,3*; GU Han-yan1,2,3; QIU Yan-jun1,2,3
【Addresses】1 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2 MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China; 3 Highway Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China
【Corresponding author】JIANG Xin
【Citation】Fu YG, Jiang X, Gu HY, Qiu YJ (2021) Settlement patterns of mountainous half-filled and half-cut widened subgrade with retaining wall. Journal of Mountain Science 18(10). https://doi.org/10.1007/s11629-020-6551-z
【Abstract】The settlement of widened highway subgrade in mountainous area is not only affected by the interaction between new and existing subgrade, but also seriously restricted by the external retaining wall. Based on the practical engineering of half-filled and half-cut widened mountainous highway subgrade with external balance weight retaining wall (BWRW), a sophisticated finite element numerical model is established. The evolution law of subgrade settlement is revealed during the whole process of new subgrade filling and BWRW inclination after construction. The settlement component of subgrade is clarified considering whether the existing pavement continues to be used. The results show that the additional settlement caused by the BWRW inclination after construction cannot be ignored in the widening and reconstruction of mountainous highway subgrade. In addition, pursuant to the comprehensive design of subgrade and pavement, the component of subgrade settlement should be determined according to whether the existing pavement continues to be used, while considering the influence of BWRW inclination after construction. When the existing pavement continues to be used, the settlement of the existing subgrade is caused by the new subgrade filling and the BWRW inclination after construction. On the contrary, the settlement is only caused by the BWRW inclination after construction.
【Keywords】Mountain road widening; Balance weight retaining wall; Subgrade settlement; Pavement utilization; Retaining wall inclination