贵州软质较破碎白云岩嵌岩桩竖向承载力分析

针对嵌岩桩只适用于完整和较完整岩体,且往往被视为端承桩的情况,以贵州两个工程项目的软质较破白云岩嵌岩桩为研究对象,其持力层岩体均较破碎,通过锚桩横梁反力装置桩基静载荷试验,分析软质较破碎岩嵌岩桩竖向承载力,探讨此类地质条件下嵌岩桩承载特性。研究结果表明,该区软质较破碎白云岩嵌岩桩桩顶荷载-位移曲线主要呈缓变型,沉降由桩身压缩控制,嵌岩段桩侧摩阻力发挥较好,荷载分担比例在30%~50%之间。根据经验参数计算及实测对比研究,得出实测嵌岩桩竖向承载力比计算值高出数倍。

Analysis for the vertical bearing capacity of single pileSfor rock-socketed pile of the broken soft dolomite in Guizhou

For rock-socketed pile is only applicable to full and complete basic rock mass and are often seen as end bearing pile. Based on the rock-socketed pile of the broken soft dolomite in a certain region,Guizhou province as the research object.Its bearing layer of rock mass are broken.Through the static load test of pile foundation.To analyze the vertical bearing capacity of rock-socketed pile of the broken soft dolomite.And to explore such geological conditions rock-socketed pile load-bearing characteristics.Results,The rock socketed pile top load displacement curve is delayed.Pile side frictional resistance of rock-socketed part play better.Load sharing ratio between 30% and 50%.According to the empirical parameters calculation and measurement of comparative study, the measured rock socketed pile vertical bearing capacity is several times higher than the calculated value.