岩土力学2025，Vol.46Issue(6)：1788-1798,1810,12.DOI:10.16285/j.rsm.2024.1063
基于次加载面理论的砂土临界状态参数模型
Critical state parameter model of sand based on subloading surface theory
摘要
Abstract
The unified critical state parameter model(clay and sand model with subloading surface,CASM-S)effectively describes the mechanical behavior of sand and overconsolidated clay.However,the model does not include the nonlinear critical state line of sand.This study investigates the soil's compression characteristics and its nonlinear critical state line in thee-lnp plane.The CASM-S introduces a power function form of the critical state line and reference compression line(RCC)suitable for sandy soil.With additional parameters ξ and λr,yield surface and subsequent loading surface functions are proposed to describe the shear characteristics of the sand.The linear relationship of the reference compression curve in the e-(p/p a)ξplane(where e is the void ratio at the critical state,p is the normal stress,and pa is the standard atmospheric pressure)is utilized to propose a method for determining the initial consolidation pressure pc0.All 11 parameters required for this model can be obtained through conventional geotechnical tests or empirical methods.Finally,by comparing the model's predictions with triaxial drained and undrained shear test results for four types of sand,the refined CASM-S effectively considers the effect of nonlinear critical state line and describes the triaxial shear characteristics of saturated sand under varying void ratios and confining pressures.关键词
临界状态/饱和砂土/次加载面/弹塑性模型Key words
critical state/saturated sand/subloading surface/elasto-plastic model分类
土木建筑引用本文复制引用
富海鹰,钟雨薇,王孝文,吴博涵,袁冉..基于次加载面理论的砂土临界状态参数模型[J].岩土力学,2025,46(6):1788-1798,1810,12.基金项目
国家自然科学基金(No.52278372,No.52278413) （No.52278372,No.52278413）
中国博士后基金(No.2021M702718).This work was supported by the National Natural Science Foundation of China(52278372,52278413)and the China Postdoctoral Science Foundation(2021M702718). （No.2021M702718）
