扬州明挖隧道施工与邻近高速铁路的相互影响

Interaction Between Open Cut Tunnel Construction and Adjacent High Speed Railway in Yangzhou

扬州市江平东路三期工程新建双塘路隧道长距离邻近既有高速铁路施工,通过数值模拟分析了隧道施工引起的既有高速铁路路基变形,并对隧道基坑施工的安全性进行了分析。结果表明:新建隧道施工引起的高速铁路路基变形主要是沉降,水平变形小;既有高速铁路路堤稳定安全系数最小值为1.57,大于规范规定的最小值1.25;隧道基坑围护桩变形、基坑稳定性均满足相关规范要求。隧道邻近既有高速铁路施工安全性可得到保障。

In the third phase of Jiangping East Road Project in Yangzhou,the newly built Shuangtang road tunnel was constructed near the existing high speed railway for a long distance.The deformation of the existing high speed railway subgrade caused by the tunnel construction was analyzed by numerical simulation,and the safety of the tunnel foundation pit construction was analyzed.The results show that the subgrade deformation of high speed railway caused by the construction of newly built tunnel is mainly settlement and the horizontal deformation is small.The minimum value of the stability safety factor of the existing high speed railway embankment is 1.57,which is greater than the minimum value of 1.25 specified in the specification.Both the deformation of the retaining pile and the stability of the foundation pit could meet the requirements of relevant specifications.The construction safety of the tunnel adjacent to the existing high speed railway could also be guaranteed.