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工程科学与技术:2013,45(2):68-74
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地基附加应力和桩基沉降计算的修正Geddes应力解
(1.河海大学 岩土力学与堤坝工程教育部重点实验室;2.河海大学 岩土工程科学研究所;3.浙江大学 城市学院;4.河海大学 水资源高效利用与工程安全国家工程研究中心)
A Modified Geddes Solution for Estimating Induced Stress Coefficient of Subsoil and Settlement of Pile Foundation
(1.Key Lab.of Ministry of Education for Geomechanics and Embankment Eng.,Hohai Univ.;2.Geotechnical Research Inst.,Hohai Univ.;3.City College,Zhejiang Univ.;4.National Eng. Research Center of Water Resources Efficient Utilization and Eng. Safety,Hohai Univ.)
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投稿时间:2012-09-17    修订日期:2012-11-15
中文摘要: Geddes应力解计算桩周土沉降是工程中常用的计算方法,其假设端阻力为桩端集中力,侧摩阻力沿桩身轴线线分布。此假设下计算得到的附加应力不能反映截面几何形状和大小的影响,存在一定的误差。为了更精确地计算桩附加应力与沉降,得到可以反映截面几何形状和大小的计算方法,在Geddes应力解的基础上,假设端阻力在桩端均匀分布,侧阻力为桩侧表面均布力和线性力的综合。采用2重积分的思想,推导出了圆形桩端阻力和桩侧摩阻力在桩周土产生的附加应力系数的计算公式,称为修正的Geddes应力解。通过对Geddes应力解和修正Geddes应力解的对比计算表明:随着桩径的增大,Geddes应力解计算误差随之增大。桩径从0.2 m到3 m,Geddes应力解估算端阻力、均匀分布侧摩阻力、线性增长的侧摩阻力产生沉降的误差分别为小于20%、140%和40%。综合端阻力与侧阻力结果,Geddes应力解计算沉降结果偏大。将2种计算方法的计算结果与3维有限元ABAQUS计算结果进行了对比,结果表明修正的计算方法更接近于模拟结果。因此工程中使用修正Geddes应力解计算桩基沉降更合理。
Abstract:Geddes’s solution is one of a comment approach to estimate the settlement of subsoil of pile foundation.In order to obtain more precious results,a modified Geddes’s solution was performed as the assumptions that the end resistance uniformly distribute on the pile tip and the side resistance,and the component force of uniform and linear variation distribute on side surface of pile shaft.The formulas of induced stress due to side resistance and end resistance of circular cross-sectional pile were obtained and calculated by double integration.The results of comparative analyses between Geddes’s solution and modified Geddes’s solution showed that the differences between the two methods increase with the increase of pile radius.With pile radius varying from 0.2 m to 3 m,the results disparity between Geddes’s and modified Geddes’s solution are limited in 20%,exceeding to 140%,and closing to 40% due to end resistance, uniform side resistance,and linear variation of side resistance, respectively.The results estimated by Geddes’s solution is greater than reality. Compared with Geddes’s solution,the settlement of the modified Geddes’s solution agrees well with that of finite element analysis.Therefore,the modified solution is more reasonable for designation and application.
文章编号:201200716     中图分类号:    文献标志码:
基金项目:国家自然科学基金高铁联合基金资助项目(U1134207);国家自然科学基金资助项目(51008115);2012江苏省普通高校研究生创新计划资助项目(CXZZ12-0234);江苏省自然科学基金资助项目(BK2012811)
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吕亚茹,刘汉龙,王新泉,丁选明,郑长杰.地基附加应力和桩基沉降计算的修正Geddes应力解[J].工程科学与技术,2013,45(2):68-74.
Lyu Yaru,Liu Hanlong,Wang Xinquan,Ding Xuanming,Zheng Changjie.A Modified Geddes Solution for Estimating Induced Stress Coefficient of Subsoil and Settlement of Pile Foundation[J].Advanced Engineering Sciences,2013,45(2):68-74.