Analysis of Influence and Formation for Uncoordinated Deformation in Tram Subgrade

¹ Shanghai Urban Construction Design & Research Institute (Group) Co., Ltd., Shanghai, 200093, P. R. of China.
² Department of Transportation Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, P. R. of China.

^* Corresponding author Chongwei Huang’s e-mail: hcwei@126.com

Abstract

Aiming at horizontal and vertical uncoordinated deformation formation in Tram Subgrade, a 3D finite element model was established, which was used to analyse the mechanical response of tram monolithic roadbed on multiple depth and width of uncoordinated deformation. The results show that the uncoordinated deformation’s depth has little influence on the mechanical behavior of roadbed, and it indicates that there was remainder disengaging under the monolithic roadbed by the load of tram. On the other side, the width of uncoordinated deformation has a remarkable effect on outstanding to the horizontal tensile stress (σ_dy) in the slab bottom, deflection (D_d) on the top of slab, compressive stress (σ_sz) on the top of soil, and deflection (D_ss) on the top of soil. The deflection on the top of subgrade surface is about 1.61mm. Therefore, the designer’s attention should be paid to avoid uncoordinated deformation width in the project, and avoid destroy of monolithic slab.