摘要
海相沉积土层深厚地区的桩基承载力主要是侧摩阻力,侧摩阻力直接决定于桩土间的相对位移。据此提出了按桩顶沉降准则分析摩擦桩承载稳定性的可靠度方法。首先引进接触面单元模拟桩-土的相互作用,采用数值模拟随机响应方法拟合桩顶位移的状态方程,并给出了在确定近似解析解时,近似函数形式的选取原则,函数中待定系数及数值模拟采样点的确定方法及步骤,可靠度指标及失效概率的计算方法。最后,作为工程实例,分析了某建筑物桩基的稳定性。
The friction resistance between surface and soil is the major component of bearing force for deep pile in sea facies sediment foundation and determined by the relative displacement between the pile and soil. An analysis method for stability reliability of friction pile based on the subsidence of pile head is proposed. The concept of pile-soil interface element is introduced and its mechanical parameters, method for determining these parameters and its constitutive model are studied. The response surface method and numerical simulation are adopted to establish the approximate analytical equation for describing the relationship between the subsidence of pile head and stability reliability. The principle for selecting the form of the approximate analytical equation, the method for determining the coefficient of the equation and the determination of the sampling for numerical calculation as well as the methods for calculating the reliability degree and failure probability are further investigated. An example is given for demonstration of the proposed method.
出处
《水利学报》
EI
CSCD
北大核心
2005年第4期433-438,共6页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目(50378036)
关键词
摩擦桩
沉降
接触面
响应面
可靠度
friction pile
subsidence
interface
response surface method
reliability
