考虑工程桩有利作用情况下的某基坑支护有限元分析

当基坑周边有工程桩时，基坑支护可考虑利用工程桩-承台-地基梁体系，此时工程桩兼作支护桩，即“一桩两用”。当工程桩数量较多，间距较密，基坑开挖面以下有一定厚度的较好土层时，可在最外排工程桩的外侧设置水泥土挡墙，利用工程桩限制水泥土挡墙的位移。通过某工程的应用，验证了此类支护体系具有安全性和经济性等特点。

FEM Analysis on a Foundation Pit Support when Considering Beneficial Effect of Engineering Piles

When a foundation pit is surrounded by engineering piles, a pile-cap-foundation beam system could be considered as the pit supporting structure, wherein these engineering piles are used also as the supporting pile, namely "dual-purpose pile". When the engineering piles are numerous and spaced closely, and there has soil layer in certain thickness below the excavation surface, cement-soil wall may be set outside the outermost row of the piles so that the displacement of the wall is constrained by these piles. Depending on application in an engineering project, it is verified that such supporting system is of safety and economy.