水利学报2025，Vol.56Issue(6)：747-758,770,13.DOI:10.13243/j.cnki.slxb.20240781
基于双模量动态本构模型的沥青混凝土心墙坝心墙响应特性研究
Study on response characteristics of asphalt concrete core wall in dam based on bimodulus dynamic constitutive model
摘要
Abstract
An appropriate dynamic constitutive model serves as a crucial foundation for evaluating the seismic perfor-mance of the impervious core of asphalt concrete core dams.The results of uniaxial dynamic tension and compression tests indicate that under low-temperature dynamic loads,hydraulic asphalt concrete exhibits a significant increase in both tensile and compressive moduli,with a notable difference between them.Based on the Ambartsumyan bilinear static constitutive model in the principal stress space,this paper takes into account the differences in tensile and com-pressive Poisson's ratios.The equivalent strain rate is calculated according to the principal stress state,thereby exploring the coupling relationship among the determination of modulus,the judgment of tensile-compressive state,and the calculation of equivalent strain rate.An incremental iterative decoupling numerical analysis algorithm is developed,and a dynamic bi-modulus constitutive model for hydraulic asphalt concrete is established.The calcu-lated tensile and compressive stress-strain curves based on the constitutive model are in good agreement with the experimental results.Using the established dynamic bi-modulus constitutive model,a study on the response charac-teristics of the core of an actual asphalt concrete core dam is conducted.Under seismic loads,the dynamic bi-modulus effect of the core is evident.Compared with the dynamic bi-modulus model,the maximum dynamic compres-sive stress of the mono-modulus model is approximately 71.4％lower.The relative difference in peak acceleration at different positions can reach up to 25.78％.Ignoring the dynamic bi-modulus effect of asphalt concrete will lead to an increase in the axial and vertical tensile strains of the core by 45.8％and 27.1％,respectively,resulting in an under-estimation of the core's seismic capacity.关键词
双模量动态本构模型/水工沥青混凝土/等效应变率/心墙/地震响应Key words
bi-modulus dynamic constitutive model/hydraulic asphalt concrete/equivalent strain rate/core wall/seismic response分类
建筑与水利引用本文复制引用
李闯,宋志强,王飞,刘云贺,王宗凯,宁致远..基于双模量动态本构模型的沥青混凝土心墙坝心墙响应特性研究[J].水利学报,2025,56(6):747-758,770,13.基金项目
国家自然科学基金重点项目(52039008) （52039008）
陕西省自然科学基础研究计划项目(2022JM-276) （2022JM-276）
陕西省教育厅青年创新团队科研计划项目(22JP052) （22JP052）
