非线性条件下砂土地基中水平受荷长桩的性状分析  

Analysis of Laterally Loaded Long Piles in Cohesionless Soil in Nonlinear Conditions

作　　者：夏唐代[1,2] 王梅[1,2] 王志凯[1,2] 胡文韬[1,2] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,杭州310058 [2]浙江大学岩土工程研究所,杭州310058

出　　处：《土木建筑与环境工程》2010年第4期26-32,共7页Journal of Civil,Architectural & Environment Engineering

摘　　要：提出了水平荷载作用下,考虑土体非线性性质的砂土地基中长桩性状的分析方法。依据前人的研究成果,认为任一深度处水平土反力模量与地面处桩的位移存在一个衰减的指数函数关系。假定水平土反力模量和极限土反力均沿深度线性增长,认为随着桩位移增大,桩前土体由弹性逐渐达到塑性屈服,对于2种状态,分别建立桩的基本微分方程。分别采用Gleser有限差分结合迭代法和Reese-Matlock法给出了2组四阶变系数非线性微分方程的近似解答。现场试验和数值算例证明,该法较传统的m法计算结果更接近实测值,较p-y法方便可行,既适用于小位移的情况,也适用于桩顶出现较大位移的情况,因此,在缺乏试验参数的情况下,可以代替p-y曲线法用于工程计算。A method was developed for nonlinear analysis of laterally loaded long piles in cohesionless soil. It is considered that the modulus of horizontal subgrade reaction is related with groundline pile displacement by an attenuation power function based on the existing methods and it is assumed that both the modulus of horizontal subgrade reaction and the ultimate soil resistance increase linearly with depth . It is also considered that soil in front of the pile may change from elastic state into plastic state as pile displacement increase. Nonlinear differential equations of the fourth order were derived for both states and to solve the equations, the Gleser finite difference approach with iteration and the Reese-Matlock approach were developed,respectively of propsed methed. It is validated by the test and numerical field calculation that the results respectively of proposed methed are more accurate than ＇m＇ method and simpler than ＇p-y ＇ method. And the results are in good agreement both when pile displacement is small and large, thus it can be applied to construction in place of ＇p-y＇ method especially when test parameters are unavailable.

关 键 词：长桩 水平荷载 砂土 水平土反力模量 非线性 

分 类 号：TU473[建筑科学—结构工程]