岩土工程学报2004，Vol.26Issue(4)：546-552,7.
评价饱和砂土液化过程中小应变到大应变的本构模型
A constitutive model for evaluating small to large cyclic strains of saturated sand during liquefaction process
摘要
Abstract
A new simplified effective stress constitutive model is presented for evaluating small to large cyclic strains of saturated sand during liquefaction process.It is developed by refining and modifying Ramberg-Osgood model in the following three aspects:①A formulation for asymptotic movements of both MPTL(Moving Phase Transformation Line)and MCSL(Moving Critical State Line)is incorporated to accurately describe the effective stress path and the critical stress state;②A stress degradation model is used to describe the stress-dilatancy and to define the degradation and hardening of the skeleton curve with variation of excess pore water pressure;③A new post-liquefaction deformation theory is incorporated to model large shear strain response in cyclic undrained loading after initial liquefaction.The results calculated by the proposed model have been compared favorably with experimental observations.The new model is suitable for dynamic response analysis of level or nearly level saturated sand ground.关键词
砂土/本构模型/液化后大变形/Ramberg-Osgood模型Key words
sand/constitutive relationship/large shear strain/post-liquefaction/Ramberg-Osgood Model分类
建筑与水利引用本文复制引用
张建民,王刚..评价饱和砂土液化过程中小应变到大应变的本构模型[J].岩土工程学报,2004,26(4):546-552,7.基金项目
Supported by Natural Science Foundation of China(59979012) （59979012）
