土木与环境工程学报（中英文）2026，Vol.48Issue(4)：34-43,10.DOI:10.11835/j.issn.2096-6717.2024.087
基于密度-应力双状态参量的黏土状态硬化模型
State hardening model of clay based on density and stress state parameters
摘要
Abstract
The strength and deformation characteristics of overconsolidated clay depend on state factors such as initial void ratio,stress path and preconsolidation pressure.To characterize the state dependence of overconsoli-dated clay,we define two state parameters:the density-state parameter and the stress-state parameter.The for-mer describes the void ratio difference between the current state point and the corresponding state on the critical state line,and the latter describes that between the dyadic state point and the critical state line.A new stress-state equation is then derived.Finally,the state hardening rule is adopted to describe the hardening law of the subloading surface where the current state point lies,and a state hardening model suitable for overconsolidated clay is established.Comparisons between model predictions and triaxial compression test results of different clays under drained and undrained conditions show that the proposed model exhibits good performance.The re-sults show that stress history affects the stress-state equation of clay.The density-state and stress-state parame-ters in this equation approach zero when the soil reaches the critical state,and they characterize the compactness and moisture state of the soil respectively.The proposed state hardening rule can reasonably describe the strain softening and dilatancy of overconsolidated clay under drained shear,as well as the effective stress paths and the evolution of excess pore water pressure under undrained shear.The established clay state hardening model has a simple form with a single yield surface.Its material parameters can be calibrated by conventional laboratory tests,so it has good prospects for theoretical application in engineering practice.关键词
黏土/状态边界面/下加载面/状态硬化/本构关系Key words
clay/state boundary surface/subloading surface/state hardening/constitutive relation分类
建筑与水利引用本文复制引用
李海潮,李欣宇,张宇辉,李涛,贺佐跃..基于密度-应力双状态参量的黏土状态硬化模型[J].土木与环境工程学报（中英文）,2026,48(4):34-43,10.基金项目
天津市教委科研计划(XJ2022009601) （XJ2022009601）
天津市教委自然科学计划(2018KJ245) Tianjin Municipal Education Commission Scientific Research Program(No.XJ2022009601) （2018KJ245）
Tianjin Munici-pal Education Commission Scientific Research Program(No.2018KJ245) （No.2018KJ245）
