基于p-y曲线的抗滑桩差分解法研究

Study on Difference Method of Anti-slide Pile Based on p-y Curve

为了合理计算抗滑桩的内力及位移,根据桩侧抗力的实际分布形式,建立了考虑桩侧剪力的抗滑桩p-y曲线非线性模型,采用差分解法,推导了相应的差分计算方程,编写了计算程序,并与工程实例监测数据相比较。结果表明:计算桩体位移曲线基本能够反映实测桩体侧移的变化趋势,计算桩顶位移与实测桩顶位移平均相对误差为7.5%,计算结果与实测结果吻合较好;采用p-y曲线分析抗滑桩的受力特性是合理的,能够反映抗滑桩的受力变形特性,可方便确定桩体位移及内力,且便于确定相应的计算参数。

In order to calculate the internal forces and displacements of anti-slide pile reasonably, this paper established nonlinear p-y curve model considering the side shear force of the pile according to the actual distribution of pile side resistance. The corresponding difference equations were derived based on the difference method and the calculation program was compiled. By comparing with the monitoring data of engineering cases, the results show that the calculated displacement curve of pile can basically reflect the change trend of measured lateral displacement of pile. The average relative error of calculated displacement of pile top and measured displacement of pile top is 7.5 %. The calculated results are in line with the measured results. It is reasonable to use p-y curve to analyze the stress characteristics of anti-slide pile, which can reflect the stress and deformation characteristics of anti-slide pile, facilitate the determination of pile displacement and internal force and facilitate the determination of the corresponding calculation parameters.