冲刷作用下斜坡桩基竖向极限承载力评价方法  

Evaluation Method of Vertical Ultimate Bearing Capacity of Slope Pile Foundation under Scour

作　　者：段瑞芳[1] 王鼎[2] 王晓明[2] DUAN Ruifang;WANG Ding;WANG Xiaoming(Shaanxi College of Communication Technology,Xi’an 710018,China;Institute of Bridge Engineering,Chang’an University,Xi’an 710064,China)

机构地区：[1]陕西交通职业技术学院,西安710018 [2]长安大学桥梁工程研究所,西安710064

出　　处：《武汉理工大学学报（交通科学与工程版）》2019年第1期20-25,共6页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：陕西省教育厅专项科学研究计划资助(17JK0070)

摘　　要：由于不能考虑土体冲刷对桩周土体初始应力的影响及随着冲刷深度的增加桩周土体压缩回弹效应的增强,简单地按高承台形式来考虑水流冲刷作用对桩基承载性状的影响是不够准确的.文中建立了考虑冲刷深度比率的冲刷作用下斜坡桩基竖向承载力评价模型.设计了10组数值模拟实验,采用FLAC3D弹塑性分析软件,分析了冲刷作用对桩端阻力与桩侧摩阻力的影响机理.采用非线性回归分析,建立了冲刷作用的影响系数函数;使用基于麦考特法的通用全局优化算法进行迭代计算,确定影响系数函数的参数,得到冲刷作用下斜坡桩基竖向极限承载力评价方法.Since the influence of soil erosion on the initial stress of soil around the pile cannot be considered,and the compression rebound effect of soil around the pile increases with the increase of erosion depth,it is not accurate to simply consider the influence of water erosion on the bearing behavior of pile foundation according to the form of high pile cap.In this paper,an evaluation model of vertical bearing capacity of slope pile foundation under scouring action considering scouring depth ratio was established.Ten sets of numerical simulation experiments were designed and FLAC3D elastoplastic analysis software was used to analyze the mechanism of scour effect on pile tip resistance and pile side friction resistance.Using nonlinear regression analysis,the influence coefficient function of scouring effect was established.The general global optimization algorithm based on mccourt method was used for iterative calculation to determine the parameters of influence coefficient function,and then an evaluation method of vertical ultimate bearing capacity of slope pile foundation under scouring action was obtained.

关 键 词：斜坡桩基 竖向承载力 边坡系数 临坡距 有限差分法 FLAC 

分 类 号：TU443[建筑科学—岩土工程]