水利水电技术2017，Vol.48Issue(4)：131-135,5.DOI:10.13928/j.cnki.wrahe.2017.04.024
基于统计损伤理论的邓肯—张修正模型研究
Study on statistical damage theory-based modified Duncan-Chang model
摘要
Abstract
As the impact from grain crushing damage on deformation and strength of materials is not considered,Duncan-Chang EB model cannot simulate the strain softening defect of the rock fill materials,the statistical damage theory is introduced into Dun can-Chang hyperbolic model.Through discussion on the law of the damage variables of the different phases of the stress-strain curve of the rockfill materials,description of the damage crushing process of the rockfill and consideration of the impact from the damage threshold of the rockfi11 materials,the modified Duncan-Chang model is established;for which the parameters can be obtained from the fitting of testing data.Through verification,the modified Duncan-Chang model can better simulate the full process of the crushing damage of rockfi11 materials under high surrounding pressure,and regress to the conventional Duncan-Chang model under lower surrounding pressure.Compared with the conventional Dancan-Chang model,the statistical damage model and the elastic-plastic model,the model has the merits of simple form and few parameters.The study result can be applied to the high rockfill dam with large bottom surrounding pressure,thus provide a reference for the design calculation of rockfill dam.关键词
统计损伤理论/邓肯—张模型/堆石料/围压/损伤阈值/应力—应变Key words
statistical damage theory/Duncan-Chang model/rockfill materials/surrounding pressure/damage threshold/stress-strain分类
水利科学引用本文复制引用
伍文龙,袁林娟,张锐,彭浩..基于统计损伤理论的邓肯—张修正模型研究[J].水利水电技术,2017,48(4):131-135,5.基金项目
国家自然科学基金青年基金项目(51309224) （51309224）
