大面积堆载引起高铁桥基变形处理对策研究

摘要

The geometry state of high-speed railway track structure is directly related to the stability and smoothness of train travelling,and even safety.However,in soft soil area,because the surrounding environmental conditions changed,such as pumping,loading,excavation of foundation pit,etc.,which caused the subsidence deformation or horizontal displacement. Based on the upper bridge CPⅢ measurement data of some sectional high-speed railway,track inspection car and dynamic test results,with the foundation conditions and environmental changes,researchers carried on analysis of spatial-temporal relation and deformation mechanism between the large-area loading on the single side of the bridge and deformation of the bridge.Then the treatment scheme of monitoring and stress isolation with jet grouting pile and cement soil composite foun-dation was proposed.Meanwhile,the problems that should be paid attention to in the construction process are pointed out.%高速铁路轨道结构几何状态直接关系到高速列车运行的稳定性和平顺性，甚至安全性。但在软土地区常常因周边环境条件变化，如抽水、堆载、基坑开挖等，引起线路的沉降变形或水平偏移。基于某高铁区段桥梁上部CPⅢ测量数据、轨检小车及动检成果，结合场地地基条件和环境变化历程，分析了桥梁一侧大面积堆载与桥梁变形的时空对应关系和变形机理，提出了监测、应力隔离联合旋喷桩水泥土复合地基的处理方案。同时，提出了处理方案实施过程中应注意的有关问题。