Mindlin位移解下大直径桩基有效桩长的优化计算方法

发布时间：2019-05-28 05:21

【摘要】：大直径灌注桩存在有效桩长,其计算公式与所假设的桩侧阻力分布形式有关,针对不同的桩侧阻力分布形式,有效桩长的计算结果往往差别较大.基于Mindlin位移解的基本原理和考虑桩径的影响,确定桩侧摩阻力呈抛物线形分布时所得的有效桩长优化计算方法,并根据计算结果对其影响因素进行分析;最后,结合工程实例对推导公式进行验证.结果表明:土体泊松比和桩径变化均对有效桩长造成影响,而桩径对有效桩长的影响更显著.桩径一定时,土体泊松比对有效桩长的影响随着E/G的增大而减弱,土体泊松比一定时,桩径对有效桩长的影响随着E/G的增大而加强.因此,该假设下考虑桩径影响而优化的有效桩长计算结果更接近于工程实际,合理可行.
[Abstract]:There is an effective pile length in large diameter cast-in-place pile, and its calculation formula is related to the assumed pile side resistance distribution form. according to different pile side resistance distribution forms, the calculation results of effective pile length are often quite different. Based on the basic principle of Mindlin displacement solution and considering the influence of pile diameter, the effective pile length optimization method is determined when the pile side friction is paraboloid distribution, and the influencing factors are analyzed according to the calculation results. Finally, the derivation formula is verified by an engineering example. The results show that the Poisson's ratio and pile diameter of soil have influence on the effective pile length, and the pile diameter has a more significant effect on the effective pile length. When the pile diameter is constant, the influence of soil Poisson's ratio on the effective pile length decreases with the increase of E 鈮，

本文编号：2486770