挡墙桩基拔除与重建施工技术

Pile Foundation Removal and Retaining Structure Reconstruction

文章以上海轨道交通11号线穿越桥台桩基为工程背景,通过综合比选确定了套管拔除+水压减摩的桩基拔除方案和"L"型挡墙+搅拌桩加固的挡墙重建方案;运用数值模拟软件对重建过程位移场的变化情况进行了计算复核。计算结果表明:"L"型挡墙结构能较好地抑制河道开挖过程中墙背土体的沉降,且结构自身变位小,能满足工程安全和周边环境保护的要求。研究成果可为今后类似工程提供借鉴和参考。

An existing abutment pile foundation is affected by the Shanghi metro line 11 and needs to be removed. Schemes of pile foundation removal with casing pipe and water pressure and retaining structure reconstruction with type L retaining structure and mixing pile were chosen. The computation of displacement during reconstruction was performed by numerical simulation software and the results indicate that the type L retaining structure can restrain the soil settlement at the back wall and there is little displacement of the retaining structure, meeting the requirements of engineering safety and environmental protection.