软土区地铁隧道结构在列车荷载作用下,工后沉降问题已引起广泛关注,而考虑不均匀沉降下的轨道动力特性实测研究却未见报道。以浙江省某地铁隧道为研究对象,对该隧道两个轨道断面进行了隧道沉降变形观测和钢轨竖向振动测试。基于监测结果,分析了两断面沉降变形和振动实测结果的差异,并对软土区地铁轨道型式进行优选分析。研究结果表明:理论模型计算与振动实测结果量值相当,但理论计算模型未考虑不均匀沉降及轨道弯曲效应,较实测值小;钢弹簧浮置板轨道钢轨振级比普通整体式轨道小10 d B;钢弹簧浮置板轨道固有频率较普通整体式轨道低,列车经过时,较早达到振动峰值,列车经过后,较晚恢复平息;整体式轨道振动对周围土体的扰动大于钢弹簧浮置板轨道,因前者沉降值大于后者,沉降值变大又会进一步加大振动影响。为确保良好的运营条件,建议软土区不均匀沉降工况下采用钢弹簧浮置板等减振轨道型式。 Subway tunnel structure in soft soil area Under the train load, the problem of post-construction settlement has drawn much attention. However, there are no reports about the orbit dynamic characteristics under uneven settlement. Taking a subway tunnel in Zhejiang Province as the research object, the tunnel track deformation and the vertical vibration test of two tracks of the tunnel were conducted. Based on the monitoring results, the differences between the settlement and vibration measurement results of the two sections are analyzed, and the subway track type in soft soil area is analyzed preferentially. The results show that the calculation of the theoretical model is equivalent to that of the vibration measurement results, but the theoretical calculation model does not consider the effect of uneven settlement and orbital bending, which is smaller than the measured value. The vibration amplitude of the steel spring floating slab track is 10 d B; The natural frequency of orbit of the steel spring floating plate is lower than that of the ordinary monolithic track. When the train passes, the peak of vibration is reached earlier and the train resumes subside later. The disturbance of the monolithic orbit vibration to the surrounding soil is greater than that of the steel spring Floating slab track, because the former settlement value is greater than the latter, the settlement value becomes larger will further increase the vibration effect. In order to ensure good operating conditions, it is recommended to use the steel spring floating plate and other vibration reduction track patterns under uneven settlement conditions in the soft soil area.