现代有轨电车路基沉降与动应力测试研究

为研究现代有轨电车在实际运营过程中的路基工后沉降和路基结构层动力响应规律,分别采用静力水准仪和土压力盒监测路基不同位置沉降与动应力。沉降监测结果表明:路基工后沉降在施工完成30 d后已趋于稳定,最大工后沉降量为2.27 mm,能满足埋入式无砟轨道结构长期运营的要求。分别以不同速度进行行车测试,测试动应力结果表明:靠近轨道结构部分路基结构层动应力最大约10.5 k Pa,线路路肩位置和线路中心位置动应力均较小,约为2 k Pa,各个测点动应力变化受列车行车速度影响较小,受路基结构位置变化影响较大,但变化范围主要集中在基床结构层。

Study on Subgrade Settlement and Dynamic Test of Modern Tram

The hydrostatic level gauge and earth pressure cells are used to monitor the settlement and dynamic stress at different positions of subgrade and study the post-construction settlement and the dynamic response of the subgrade in actual operation of the modern tram. The results of settlement monitoring show that the settlement of the roadbed becomes stabile 30 days after construction and the maximum post-construction settlement is 2. 27 mm, which meets the requirement of the long-term operation of embedded ballastless track structure. The dynamic stress results show that the dynamic stress is about 10. 5 k Pa in the subgrade near the track structure,and the dynamic stress is about 2 k Pa at the shoulder and the center of the line; the changes of dynamic stress at each measuring point are less affected by the speed of train,and more by the changes of the subgrade structure,but the changes are mainly concentrated in the foundation bed structure layer.