滨海砂层地基锚管索基坑支护

Anchor pipe support for excavations in coastal sand foundation

本工程位处城市商业中心,基坑地基土层为强透水砂层且与海水连通,场地用地窄小,周边环境紧张。本文针对滨海深厚砂层地基超深基坑开挖,主要从控制变形和有效防水保证基坑开挖的顺利进行。中心城区紧邻的桩基础建筑附加荷载采用分层摩阻力计算方法,将桩基摩阻力换算成分层附加荷载。支护结构采用桩锚形式,锚管索成功用于海积砂层基坑支护,成锚过程中对地基扰动较小,施工简便其质量可靠。

The project is located in the business centre of the city. The soil of foundation pit is strongly permeable sand layer and connected with the seawater. The field land is narrow, and the surroundings are nervous. The ultra-deep excavation requires to control the deformation and effective waterproof in coastal deep sand foundation. The additional load near the pile foundation constructed in the city center is calculated using the method of stratified frictional resistance. The frictional resistance of the pile is translated into the layered additional load. The supporting structure using pile anchor type and anchor pipe is used successfully in alluvial sand excavations. The construction process is simple and the quality is reliable, and the disturbance is small.