考虑压实质量和改进本构的沥青心墙坝性态分析  

Structural behavior analysis of asphalt concrete core wall dams based on real compaction quality and modified constitutive model

作　　者：常周梅 刘东海[1] 陈辉[1] 梁健羽 CHANG Zhoumei;LIU Donghai;CHEN Hui;LIANG Jianyu(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300350

出　　处：《水力发电学报》2024年第2期86-98,共13页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金面上项目(51979189,52279136)。

摘　　要：针对邓肯-张模型对沥青混凝土心墙料力学性质描述偏离的不足,改进了心墙沥青混凝土本构模型;同时,考虑实际施工中各分区坝料压实质量空间差异导致的物理力学特性空间差异,提出了考虑坝料实际压实质量的大坝有限元分析方法。首先,通过数字大坝系统采集到的施工数据,对大坝各坝料分区进行压实质量空间估计;其次,建立各坝料分区本构模型参数与压实质量的定量关系,实现对任意单元材料参数的空间估计,并通过Abaqus软件的二次开发,实现坝料本构模型参数的每个单元赋值;最后,结合工程实例,对沥青混凝土心墙堆石坝施工期结构性态进行精细数值分析。结果表明,考虑坝料实际压实质量的数值模拟可以更好地反映大坝实际施工过程的应力变形情况;改进后的本构模型提高了心墙变形计算的准确性,为精确分析沥青混凝土心墙堆石坝结构安全提供了有效途径。To solve the deficiency of the Duncan-Chang model in describing the mechanical properties of core wall asphalt concrete,a modified constitutive model for this material is presented.And a finite element analysis method is developed based on the real compaction quality of different dam materials,to better consider spatial variations in the compaction quality of dam materials during real construction that often results in spatial differences in their mechanical properties.First,a spatial estimation of compaction quality for different dam materials is made using construction data collected by a Digital Dam system.Then,we construct quantitative relationships between compaction quality and constitutive model parameters for different dam materials,and determine the constitutive model parameters of each element;Through a secondary development of Abaqus,a spatial estimation of constitutive model parameters for different dam material zones is realized.Finally,we make a fine numerical analysis of the structural behavior during the construction of an asphalt concrete core wall rockfill dam for a real project.The results show that numerical simulation based on the real compaction quality of dam materials can better describe stress and deformation distributions in construction process,and the modified constitutive model improves the calculation accuracy of core wall deformation.Thus,this study demonstrates an effective approach to accurate analysis of the structural safety of asphalt concrete core wall rockfill dams.

关 键 词：沥青混凝土心墙 堆石坝 本构模型 参数空间估计 压实质量 结构性态 

分 类 号：TV311[水利工程—水工结构工程]