用于检测混凝土防渗墙裂缝的物探方法属于工程物探的范围，工程物探是地球物理勘探在工程工作中的应用分支。地球物理勘探技术是一门通过观察和研究地球上各种物理场的规律和变化来解决地质上的一些问题的一种方法。组成地壳岩土的介质一般有所不同，所以它们在密度、弹性等方面上存在这一定的差异，这样会引起地球物理场的变化，这种变化被称为地球物理异常。地球物理勘探就是通过物探方法来解决地质问题。

Track-bridge interaction was simulated by using nonlinear spring,and the simulation method was proved based on the experimental results of related documents.Taking a U-shape section and single-tower cable-stayed bridge on Shanghai-Kunming Passenger Dedicated Line as an example,the spatial finite element model of tower-cable-rail-beam-pier was established by using large general-purpose finite element software ANSYS.The transfer law of rail longitudinal force on cable-stayed bridge was analyzed,and the impacts of design parameters on rail longitudinal force were studied,the design parameters included longitudinal resistance model,cable-stayed bridge structure system,temperature load,wind load and so on.Analysis result shows that rail longitudinal resistance can be simplified in accordance with ideal elastic-plastic model.Compared with floating system,rail longitudinal force reduces by about 30% through tower and beam consolidation.When calculating rail expansion force,load can be applied according to beam increasing-temperature 15 ℃ and cable increasing-temperature 40 ℃.In windy areas,rail longitudinal force on cable-stayed bridge caused by wind can be larger than 60 kN.