摘要
为了探讨分析软土地区道路建设期间桥梁桩基施工对邻近区域既有路基的影响,以张新高速公路所跨越的一段既有铁路路基为研究对象,依托桩基施工项目,通过现场变形监测,获取了深层水平位移以及路基沉降数据,分析了桩基施工对邻近铁路路基稳定性的影响。结果表明,地下深层水平位移变形变化较大部位出现在地面堆载较多以及软土层深厚区域,路基沉降变形变化主要发生在施工前期,后期逐渐趋于稳定。通过采取高压旋喷桩施工工艺结合软土表层处理技术,可以有效抑制土体变形,达到对既有路基影响小的良好效果。
In order to explore and analyze the effect of the pile foundation construction of bridges on the existing sub-grade in neighboring areas in the process of road construction,the data about the deep horizontal displacement and the settlement of the roadbed are obtained through the site deformation monitoring to analyze the effect of the pile foundation construction on the stability of the neighboring railway sub-grade in the course of which the Zhang-Xin Expressway is taken as the object of our research and our research is based on the pile foundation construction project.The result of our research shows that the part with relatively greater change in deep horizontal displacement deformation emerges where there is much stack on the ground and the soft-soil stratum is deep.The change in the settlement of the sub-grade chiefly happens in the earlier stages of the construction and tends to be stable in later stages.The deformation of the soil bodies may be effectively prevented by the high-pressure jet grouting process in combination with the surface-treating techniques for soft soil,with the good effect of reducing the impact of the pile foundation construction on the existing sub-grade achieved.
作者
陈杰儒
CHEN Jieru(The 5th Engineering Co.Ltd.of the 18th Bureau Group of China Railway,Tianjin 300451,China)
出处
《国防交通工程与技术》
2020年第1期48-51,共4页
Traffic Engineering and Technology for National Defence
关键词
软土地区
桩基施工
既有路基
变形监测
soft-soil area
pile foundation construction
the existing sub-grade
deformation monitoring
