桩土接触面切向刚度数据拟合

Tangential stiffness fitting in pile soil system contact surface

为确定接触面参数的取值问题从而减小桩土体系中桩基与土体之间发生的相对滑移危害.引入摩尔-库仑和颗粒流理论,以桩土接触面粗糙程度作为切入点进行深入分析,确定可以作为切向刚度定量计算的影响因素.采用回归分析探究能够反映接触面切向刚度与影响因素关系的回归模型.建立切向刚度与两类影响因素之间的数学关系,通过Matlab数值分析软件,进行三维立体曲面拟合,从而得到接触面切向刚度变化规律及取值方法.以分析出接触面切向刚度对桩土体系工作性能的影响.

As the important index to the contact surface parameters, shear stiffness is influenced on the relative slip hazards between pile and soil. For the sake of studying this aspect of the problem, Mohr Coulomb and theory of particle flow were used to analyze the influence factors of pile soil contact surface tangential stiffness. Determining the factors that can be used for calculating quantitatively, regression analysis was used to explore the model that reflect the relationship between tangential contact stiffness and external factors. The mathematical relationship between tangential stiffness and the two types of factors was established and three-dimensional surface fitting was carried out by using Matlab numerical analysis software to determine the reasonable magnitude of tangential stiffness. This study provides the reference for choosing method of pile soil contact surface parameters and analyzing the effect of shear contact stiffness of pile.