深浅坑基坑设计及分析

以杨高路隧道项目深浅坑基坑设计为例，采用PLAXIS、同济启明星设计软件对基坑围护结构进行建模分析。通过PLAXIS有限元分析得出深浅坑开挖是围护桩内力与变形，同时采用同济启明星考虑浅坑坑底土m值折减得到围护桩内力与变形，两者结果包络设计，最终基坑实测结果较计算结果偏小，此设计方法安全可信。

Design and Analysis of Deep and Shallow Foundation Pits

Taking the deep and shallow pit design of Yanggao Road Tunnel project as an example, the foundation pit retaining structure is modeled and analyzed by PLAXIS and Frws7 design software. Through PLAXIS finite element analysis, it is concluded that the excavation of deep shallow pit is the internal force and deformation of retaining pile. And the internal force and deformation of retaining pile can be obtained by using Tongji Qixing method considering the M value of the soil at the bottom of shallow pit. The final measured results of the foundation pit are smaller than the calculated results, so the design method is safe and reliable.