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嵌岩桩桩端承载力探讨
引用本文:李镜培,王勇刚.嵌岩桩桩端承载力探讨[J].上海力学,2006,27(1):118-123.
作者姓名:李镜培  王勇刚
作者单位:同济大学岩土工程重点实验室 上海200092
基金项目:上海市重点学科建设资助项目
摘    要:以往嵌岩桩的试验资料表明,当上覆岩土层较薄、嵌岩桩的入岩深度较小时,嵌岩桩的极限端承力对桩的承载能力起主导作用。为求出桩端极限承载力的表达式,本文将嵌岩段以上岩土层自重视为作用在基岩半平面上的均布荷载,把桩端合力分解为相对简单的荷载作用于基岩平面上,利用滑移线理论并通过叠加的方法分析出桩端基岩破坏时的最危险点。然后根据Mindlin课题求出该点的应力,运用Griffith准则的Murrell推广导出桩端极限承载力的公式,并指出了此公式的适用范围。最后结合工程实际进行了对比分析,表明本文方法具有一定的实用性。

关 键 词:嵌岩桩  极限端承力  极限承载力  最危险点
文章编号:0254-0053(2006)01-118-6
收稿时间:2004-03-08
修稿时间:2004年3月8日

Study of Tip Resistance on Rock Socketed Pile
LI Jing-pei WANG Yong-gang.Study of Tip Resistance on Rock Socketed Pile[J].Chinese Quarterly Mechanics,2006,27(1):118-123.
Authors:LI Jing-pei WANG Yong-gang
Institution:Departement of Geotechnical Engineering, Tongji University, Shanghai 200092, China
Abstract:When the soil and rock above the tip plane of the pile is thin,and the depth of the pile inserts into the rock is small,the ultimate bearing capacity is the main effect of ultimate tip resistance according to the former experiment data.A calculation method for the ultimate tip resistance of rock socketed pile was conducted.The geostatic stress of soil and rock was considered as homogeneous load on the tip plane of the pile,and then the force of the pile tip was decomposed into some simple forces.According to the theory of slipping line,the most dangerous point on the tip plane of the pile was confirmed,and the stress of the point was obtained according to Mindlin solution.In order to attain the expression of ultimate tip resistance of rock socketed pile,multi-dimensional Griffith criterion was introduced,and then points out the fitted range of the expression.Finally the comparison between this method and data from the fact of the practical project shows good agreement in some degree.
Keywords:rock socketed pile  ultimate tip resistance  ultimate bearing capacity  most dangerous point
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