静力触探贯入机理的数值模拟研究

Numerical Simulation Study on Penetration Mechanism of Static Penetration Test

本文结合已有的拉格朗日-欧拉分析方法,使用有限元软件模拟了不排水的黏土静力触探贯入过程。研究分析了该过程中土体刚性指数,塑性区和初始应力状态参数等因素对锥尖阻力的影响。结果表明:随着贯入深度的不断增大,锥尖阻力也随之增大,在贯入深度达到某一值时锥尖阻力开始趋于稳定;随着土体刚度指数的增加,塑性区范围也在不断增加;并且土体刚度指数和圆锥摩擦系数的取值对该曲线的斜率影响不大。

Combined with Lagrange-Euler analysis method,this paper simulates the penetration process of undrained clay by static cone penetration with the finite element software software.The influence of soil rigidity index,plastic zone and initial stress on the cone tip resistance is analyzed.The results show that with the increasing of penetration depth,the resistance at the cone tip also increases,and when the penetration depth reaches a certain value,the resistance at the cone tip begins to stabilize.With the increasing of soil stiffness index,the range of plastic zone also increases.And the values of soil stiffness index and cone friction coefficient have little influence on the slope of the curve.