考虑实际分布形式的水平受荷桩桩周土抗力分析方法  

ANALYTICAL METHOD OF SOIL RESISTANCE AROUND LATERALLY LOADED PILES CONSIDERING ITS ACTUAL DISTRIBUTION

作　　者：江杰[1,2,3] 付臣志 王顺苇 欧孝夺 JIANG Jie;FU Chen-zhi;WANG Shun-wei;OU Xiao-duo(College of Civil Engineering and Architecture,Guangxi University,Nanning,Guangxi 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning,Guangxi 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Guangxi University,Nanning,Guangxi 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]广西防灾减灾与工程安全重点实验室,广西南宁530004

出　　处：《工程力学》2021年第11期199-211,共13页Engineering Mechanics

基　　金：国家自然科学基金项目(52068004,51978179);广西自然科学基金项目(2018JJA160134);广西重点研发计划项目(AB19245018)。

摘　　要：p-y曲线法被广泛应用于水平受荷桩荷载位移响应的分析中,但该方法无法准确地反映出桩周土抗力的实际分布形式。鉴于此,该文考虑了桩-土实际相互作用,假定随着径向位移的增加,桩的被动侧径向土压力呈双曲线形式增大,主动侧径向土压力呈线性减小,从而建立了桩周径向土压力与径向位移的关系;在此基础上,对摩阻力的初始刚度进行修正,引入双曲线荷载传递模型求解了桩周环向摩阻力;最后提出了考虑实际分布形式的桩周土抗力分析方法,并通过2个算例验证了正确性。通过参数分析表明:径向土压力和环向摩阻力对土抗力的贡献程度与水平位移有关;极限状态下,传统的桩侧环向摩阻力水平分量不均匀分布的形状系数偏大,该文给出了建议的取值;对径向土压力水平分量和环向摩阻力水平分量进行归一化分析,得到了拟合曲线公式,可为后续分析提供参考。p-y curve method is widely used in the analysis of load-displacement response of laterally loaded pile,but this method cannot accurately reflect the actual distribution of soil resistance around the pile.Taking actual pile-soil interaction into consideration,the relationship between radial soil pressure and radial displacement is established according to the assumption that the radial soil pressure around the passive side of pile increases with the increase of radial displacement in a trend of hyperbolic curve,while the radial soil pressure around the active side of pile decreases linearly with the increase of radial displacement.On this basis,initial stiffness of friction resistance is improved and the friction resistance is solved by adopting the hyperbolic load transfer model.Finally,the method of soil resistance with the consideration of the actual form of distribution is proposed,and the correctness is verified by two numerical examples.In addition,the results of parametric analysis show that the contributions of radial soil pressure and frictional resistance to soil resistance are related to the horizontal displacement.In the limit state,the shape coefficient of the non-uniform distribution of the horizontal component of the friction resistance on the pile side by traditional method is too large and a suggested value is given.Furthermore,the formulas of matched curves are obtained by means of normalized analysis of the horizontal component of radial soil pressure and friction resistance,which can provide reference for subsequent analyses.

关 键 词：水平受荷桩 径向土压力 环向摩阻力 土抗力 参数分析 

分 类 号：TU471.3[建筑科学—结构工程]