高速铁路路基帮填沉降变形控制及监测技术应用探讨

高速铁路路基帮填将引起既有线附加沉降变形,为研究帮填路基有效可行的沉降变形控制技术及运营高速铁路安全监控技术,结合某新建客运专线引入既有高铁站,与运营高速铁路并站设置引起既有线路基帮填的工程实例,探讨帮填路基地基采用管桩桩筏结构加固及采用泡沫轻质土代替常规土质填料作为控制路基沉降变形措施的适用性,通过数值计算评估既有线附加沉降量为1.75~3.42 mm,验证设计方案是可行的;探讨自动化监测技术应用于运营高速铁路沉降变形监测,并建立预警及多方联动机制以确保运营安全是必要的、可行的。目前实测路基沉降量为1.73~2.44 mm,实测值略低于评估值且沉降较为均匀。

Discussion on Subgrade Widening Settlement Deformation Control and Monitoring of High-Speed Railway

High-speed railway subgrade widening is likely to cause subsequent settlement deformation of the existing railway. To study the effective and applicable settlement deformation control and high-speed railway operation monitoring,the practical engineering of a newly built dedicated passenger line leading into the existing high-speed railway station and requiring the widening of the existing railway subgrade is referenced to analyze the applicability of pipe pile-raft structure and foamed light soil instead of conventional padding in settlement deformation control. The results show that the subsequent settlement from numerical simulation is 1. 75 ~ 3. 42 mm,which proves the feasibility of the design scheme. Applying the automatic monitoring to settlement deformation monitoring of high-speed railway operation and the establishment of early warning and multi-lateral cooperation system for safe operation are proved necessary and feasible. The currently measured subgrade settlement is 1. 73 ~ 2. 44 mm,which is homogeneous and lower than the estimated value.