To guarantee the operation safety of the tram in typical soft soil area, the damage characteristics of tram track slabs due to subgrade differential settlement, dynamic train loads and environmental issues are investigated in this work. A three-dimensional (3D) finite element analysis (FEA) model is utilized to calculate the additional track vertical profile irregularity due to the subgrade differential settlement. The overall rail vertical profile irregularities are employed as excitations of a tram vehicle-track-subgrade coupling model to calculate the dynamic pad forces. After that, a sequentially coupled thermal-stress analysis procedure is proposed to evaluate the initial stress-damage field of the slabs resulting from environmental temperature variation. The plastic damage theory is adopted to investigate the damage characteristics of tram track slabs due to multiple issues. According to the damage factors calculated from this model, the criterion of subgrade differential settlement of the tram track is proposed. The damage state of the tram track is suggested to be a key factor of the subgrade differential settlement control system.

为保证有轨电车在典型软土地区的运行安全，研究了路基不均匀沉降、列车动态荷载和环境问题对电车轨道板的破坏特性。三维 (3D) 有限元分析 (FEA) 模型用于计算由于路基差异沉降引起的附加轨道垂直剖面不规则性。整个轨道垂直轮廓不规则被用作有轨电车车辆-轨道-路基耦合模型的激励，以计算动态垫力。之后，提出了一种顺序耦合的热应力分析程序来评估由于环境温度变化引起的板坯初始应力损伤场。采用塑性损伤理论研究有轨电车轨道板因多重问题引起的损伤特性。根据该模型计算的损伤系数，提出了有轨电车轨道路基不均匀沉降判据。建议电车轨道的损坏状态是路基差异沉降控制系统的关键因素。