北京地区小净距隧道下穿高速铁路路基段的施工影响

Construction Influence of Small Clear Distance Tunnel Under-crossing High-speed Railway Subgrade Section in Beijing

以下穿既有高速铁路基段的北京地区新建小净距暗挖区间工程为背景,采用Madis/GTS有限元软件建立有限元模型对下穿施工过程进行计算分析。总结了小净距暗挖区间施工过程中既有高速铁路路基水平位移及沉降变化特征,并用实际监测数据据总结位移变化规律,验证了数值计算的可行性。基于类似项目相关数据,提出了下穿施工过程中高速铁路的路基结构及轨道变形控制指标。

With the background of newly-built small clear distance underground excavation interval project in Beijing under-crossing the existing high-speed railway subgrade section,a finite element model is established by using the Madis/GTS finite element software to calculate and analyze the construction process of under-crossing.The characteristics of the horizontal displacement and settlement of the existing high-speed railway subgrade during the construction of the small clear distance underground excavation interval are summarized.The displacement variation pattern is summarized with the actual monitoring data to verify the feasibility of the numerical calculation.Based on the relevant data of similar projects,the subgrade structure and track deformation control indexes of high-speed railway during the construction of under-crossing are put forward.