岩土工程学报2024，Vol.46Issue(z2)：67-71,5.DOI:10.11779/CJGE2024S20020
考虑黏土非线性特性的锥尖系数小孔扩张计算方法
Spherical cavity expansion-based method for cone factor considering nonlinear characteristics of clay
摘要
Abstract
According to the current specifications,the undrained shear strength of clay is interpreted based on the recommended cone factor derived from empirical values.However,this factor has limitations in terms of its empirical nature.Moreover,the existing cone factors are derived from the elastic-perfectly plastic model,without considering the nonlinear characteristics of soil deformation.To tackle these issues,a simulation of the cone penetration process is performed using the finite element software ABAQUS.The cone resistance qc is assessed using the hyperbolic hardening model for clay,and the arbitrary Lagrangian Eulerian(ALE)remeshing technique is employed to prevent grid distortion.The finite element results show that the factors such as soil stiffness,cone roughness and failure criteria affect the cone factor.Furthermore,the undrained expansion for a circular cavity is simulated using the finite element method to obtain the expression for the ultimate bearing capacity factor.Subsequently,an equivalent conversion relationship between the smooth cone tip resistance and the limit expansion pressure of the cavity is established.Finally,a verification against an engineering case is conducted.关键词
静力触探/大变形有限元/小孔扩张/锥尖系数/软黏土Key words
cone penetration test/large deformation finite element/cavity expansion/cone factor/soft clay分类
建筑与水利引用本文复制引用
林毅峰,朱俊霖,俞剑,黄茂松,校建东..考虑黏土非线性特性的锥尖系数小孔扩张计算方法[J].岩土工程学报,2024,46(z2):67-71,5.基金项目
中国长江三峡集团有限公司科研项目(202103495) （202103495）
