岩土力学2025，Vol.46Issue(12)：3707-3714,8.DOI:10.16285/j.rsm.2024.1615
砂土全应变范围非线性特性对贯入大变形问题的影响分析
Influence of full-strain-range non-linearity of sand on cone penetration response
摘要
Abstract
The penetration response of cone penetration test(CPT)depends on the stress and density states of sand and is also influenced by the non-linear stress-strain relations of soils from very small(10-5)to relatively large(10-1)strain levels.Accounting for these key soil behaviours is crucial for accurate numerical simulations of CPT responses.For this purpose,an intergranular strain(IGS)-based elastic model is introduced into a state-dependent plasticity model to capture the full-strain-range non-linearity behaviour of sand.A numerical model of the CPT penetration process is then established by combining the aforementioned constitutive model and the arbitrary Lagrangian-Eulerian(ALE)large deformation finite element technique.The latter is adopted to handle the problems of large deformations of soil and mesh distortion.Then the computed response of CPT is compared with 1g test observations,and the numerical model is utilized to analyse the influences of the full-strain-range non-linearity behaviour of sand on the penetration response of CPT.The results indicate that the non-linear stress-strain relations at small strains can have noticeable impacts on the tip resistance of CPT,in particular for loose sand,while having a relatively small influence on the penetration depth required to reach a steady-state penetration resistance.The above influences might be attributed to a rapid decay of soil strains with the distance from the cone tip,and consequently high stiffness and strong constraints effects of far-field soils on core soils adjacent to the cone tip.Furthermore,this paper explores the strong constraint effects of far-field soils through the analysis of the cavity expansion problem,highlighting the significance of full-strain-range non-linearity of sand in addressing large deformation issues related to deep compression failure.关键词
砂土/静力触探试验/数值分析/状态相关本构模型/小应变刚度Key words
sand/cone penetration test(CPT)/numerical simulations/state-dependent constitutive model/small strain stiffness分类
建筑与水利引用本文复制引用
TONG Sen-jie,HUANG Mao-song,SHI Zhen-hao,WANG Bin..砂土全应变范围非线性特性对贯入大变形问题的影响分析[J].岩土力学,2025,46(12):3707-3714,8.基金项目
国家自然科学基金(No.11972260) （No.11972260）
中国博士后科学基金(No.2024M763075). This work was supported by the National Natural Science Foundation of China(11972260)and the China Postdoctoral Science Foundation(2024M763075). （No.2024M763075）
