新建立交桥对邻近既有铁路路基变形影响分析  

Analysis on the Influence of New Overpass on the Deformation of Adjacent Existing Railway Subgrade

作　　者：郑荣政 ZHENG Rongzheng(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《路基工程》2021年第2期134-139,共6页Subgrade Engineering

摘　　要：以某新建立交桥工程为依托,采用数值分析方法,分析新建立交桥施工全过程和运营荷载作用下对邻近既有铁路路基变形的影响。研究表明:新建立交桥引发邻近铁路路基的沉降值大于水平位移,且地层内水平位移分布较为均匀;邻近铁路路基的沉降值主要发生在桥体施工阶段,主要为由桥体荷载引发的地层附加应力导致的压缩变形,运营期荷载下引发的路基沉降相对较小;新建立交桥引发的邻近铁路路基纵向差异沉降较为明显,且距桥墩施工区域越远,沉降值越小;水平向差异变形较小,且分布较为均匀。Based on a new overpass project,the influence of the whole construction process of the new overpass and the operation load on the deformation of the adjacent existing railway subgrade is analyzed by means of numerical analysis.The results show that the settlement value of the railway subgrade caused by the new overpass is higher than the horizontal displacement,and the horizontal displacement distribution in the stratum is more uniform.The settlement value of the adjacent railway subgrade mainly occurs in the construction stage of the bridge body,which is mainly caused by the compression deformation resulting from the additional stratum stress caused by the bridge body load.The settlement value of the railway subgrade caused by the load during the operation period is relatively small.The longitudinal differential settlement of adjacent railway subgrade caused by new overpass is obvious,and the farther it is from the bridge pier construction area,the smaller the settlement value will be.The horizontal difference deformation is small and the distribution is more uniform.

关 键 词：邻近施工 铁路路基 竖向位移 水平位移 差异沉降 

分 类 号：TU441.6[建筑科学—岩土工程]