增设跨线栈桥对既有铁路路基的影响分析

某电厂增设的栈桥，横跨电厂站既有铁路路基，栈桥桩基础位于站场铁路线之间。采用三维有限元模型对增设栈桥的施工期和使用期的不同工况进行了数值模拟，针对增设栈桥对电厂站站区既有铁路路基的影响，进行了计算分析和研究。研究结果表明:栈桥施工期和试用期，由于地基土应力的变化，将引起既有铁路路基发生一定的水平和竖向位移变形，但所产生的应力和变形对既有铁路路基的影响较小，能够满足既有铁路的安全运营。

Analysis on Influence of Addition of Flying Trestle on Existing Railway Subgrade

A power plant built a trestle over the existing railway subgrade therein with the pile foundation of the trestle lied between the railway lines in the station yard. With 3D FEM model, the different conditions of the added trestle in the periods of construction and operation were simulated numerically; and then the influence of the added trestle on the existing railway subgrade within the power station area was calculated and studied. The result shows that during the construction and operation of the trestle, the existing railway subgrade may have certain horizontal and vertical displacement deformation which is caused by the change of pile - soil stress in the foundation ; however, the stress and deformation arose therefrom has minor effect on the existing railway subgrade, which may meet the requirement of safe operation.