临地铁全回转干成孔灌注桩承载力特性实例分析

Case study on bearing capacity characteristics of dry-hole cast-in-place pile near metro station

本文依托工程实例北京市海淀区某紧邻地铁的全回转干成孔灌注桩项目,综合试验场地工程水文地质条件,对临近地铁的全回转干成孔灌注桩进行了研究。文中详细介绍了设计参数的选取及试验过程,通过对比泥浆护壁施工的灌注桩的试验数据,包括试桩承载力、变形以及摩阻力的分析,总结不同深度土层摩阻力曲线变化规律,进一步阐明了影响紧邻地铁的全回转干成孔灌注桩承载力和变形的各种因素,并为类似工程提供经验。

In this paper,a full-rotation dry cast-in-place pile near the subway is studied by basing on a fullrotation dry cast-in-place pile project near the subway in Haidian district,Beijing and synthesizing test site engineering hydrogeological conditions.The selection of design parameters and the test process are presented,the change rules of the friction resistance curves of the soil layers at different depths are summarized by comparing the experimental data what includ the bearing capacity,deformation and friction resistance of the cast-in-place piles of mud wall construction.It further illuminates the various factors affecting the bearing capacity and deformation of the full-rotation dry-hole cast-in-place piles near the subway,and provides experience for similar projects.