宿州东站配套工程对京沪高铁路基影响评估分析

Impact Analysis of Auxiliary Project of Suzhou East Railway Station on Subgrade of Beijing-Shanghai High-speed Railway

软弱土地区因周边工程建设,包括基坑开挖、降水和加载等,极易引起无砟轨道高铁线路的变形,若控制不当,势必会影响到线路的正常安全运营。以京沪高速铁路宿州东站配套工程建设为例,采用工程类比和有限元分析相结合的方法,对高铁路基周边基坑开挖引起的路基工程变形和稳定性变化进行定性分析与定量评价,分析了不同工况条件下站区路基的整体稳定性和各股道特征点的变形量,提出了配套工程设计、施工及监测方面应注意的问题和有关建议,可供类似工程评价分析参考。

In soft soil regions,the construction activities in neighboring areas of high-speed railway,including foundation pit excavation,dewatering and loading,can easily cause deformation of ballastless track of high-speed railway. If the situation is not properly controlled,it is bound to affect the safety and normal operation of railway lines. Taking auxiliary project construction of Suzhou East Railway Station of Beijing-Shanghai High-speed Railway as an example,this paper carried out the qualitative analysis and quantitative evaluation for the deformation and stability variation of subgrade due to foundation pit excavation in the surrounding area,by adopting a method that combined engineering analogy and finite element analysis.Meanwhile,it analyzed the overall stability of subgrade in the station and the deformation of feature points on tracks under different working conditions. Notable issues and suggestions during design,construction and monitoring of auxiliary projects were put forward in this paper,which could provide references for engineering analysis of similar projects.