为保证地道桥顶进过程中上方便梁轨道的列车安全运行,必须对列车通过时既有轨道动态特性进行全面检测。试验的三个阶段为限速阶段、制动阶段、监测阶段,试验内容包括轨道脱轨系数、轮重减载率、轨距弹性挤开量等。根据试验结果,分析地道桥顶进法对既有轨道动态特性的影响,同时全过程监控行车安全,为以后地道桥顶进施工时提高列车限速提供重要参数。 In order to ensure the safe operation of tramway on the upper beam during the process of tunneling, the dynamic characteristics of the existing orbit must be fully tested. Three stages of the test speed limit stage, braking stage, the monitoring stage, the test includes track derailment coefficient, wheel load reduction rate, the gauge gauge and other elastic extrusion. According to the test results, the influence of the tunneling method on the dynamic characteristics of the existing track is analyzed. At the same time, the traffic safety is monitored in the whole process, which provides the important parameters for raising the speed limit of the train when heading into the tunnel in future.