岩土工程学报2024，Vol.46Issue(7)：1534-1540,7.DOI:10.11779/CJGE20230291
沥青混凝土心墙坝漫顶溃坝试验与溃坝过程数值模拟
Model tests and numerical simulation of overtopping-induced breach process of asphalt concrete core dams
摘要
Abstract
Based on the dam breach case data of Sheyuegou Reservoir in Xinjiang Autonomous Region of China,the model tests on overtopping-induced breach of asphalt concrete core dams are conducted in the flume erosion model test system,and the process of erosion of dam shell materials and bending of core walls is visually demonstrated.It is found that the asphalt concrete core with strong erosion resistance has important influences on dam breach process.The breach process of asphalt concrete core dams due to overtopping can be divided into three stages:retrogressive erosion of dam shell materials,the first fracture of asphalt concrete core until the occurrence of the peak flows,occurrence of multiple fractures of core wall until the stabilization of the breach morphology.Based on the breach model test results,a mathematical model is developed to simulate the breach flow discharge and the breach morphology evolution of asphalt concrete core dams due to overtopping.The highlights of the model are the simulation of the exposed length of asphalt concrete core by soil erosion formula,and the calculation of breaking time,breaking length,and number of breaking time of the exposed core wall by the moment balance method.Therefore,the coupling mechanism between dam shell materials and core wall of asphalt concrete core dams can be reflected reasonably during dam breaching.The mathematical model is used to conduct back analysis of the dam breach process of Sheyuegou Reservoir,and the calculated results show that the relative errors of important breaching parameters are within±25%,which gives a good perfomance in dam breach modeling.The research results can provide reference for simulation of breach process of overtopping-induced asphalt concrete core dams.关键词
射月沟水库/沥青混凝土心墙坝/溃坝过程/模型试验/数学模型Key words
Sheyuegou Reservoir/asphalt concrete core dam/breach process/model test/mathematical model分类
建筑与水利引用本文复制引用
杨蒙,钟启明,林忠,李宇,卢洪宁..沥青混凝土心墙坝漫顶溃坝试验与溃坝过程数值模拟[J].岩土工程学报,2024,46(7):1534-1540,7.基金项目
国家重点研发计划项目(2022YFC3005501) （2022YFC3005501）
国家自然科学基金长江水科学研究联合基金重点支持项目(U2040221) （U2040221）
