过渡料特性对沥青混凝土心墙开裂的影响  

Influence of Transition Material Characteristics on Cracking of Asphalt Concrete Core Walls

作　　者：刘波[1] 王俊杰 孙众 刘良军 LIU Bo;WANG Junjie;SUN Zhong;LIU Liangjun(School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Materials Scienceand Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Wushan Water Conservancy DevelopmentCo.,Ltd.,Chongqing 404700,China;Chongqing Tengyun Engineering Consulting Co.,Ltd.,Chongqing 409000,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆交通大学材料科学与工程学院,重庆400074 [3]重庆巫山水利发展有限公司,重庆404700 [4]重庆腾云工程咨询有限公司,重庆409000

出　　处：《人民珠江》2024年第8期104-113,共10页Pearl River

基　　金：重庆市水利科技项目(CQSLK-2023006);重庆市研究生联合培养基地建设项目(JDLHPYJD2018001);重庆交通大学研究生科研创新项目资助(2023S0038)。

摘　　要：沥青混凝土心墙的应力水平变化不仅受自身材料特性影响,也受相邻过渡料特性的制约,改变过渡料特性会对心墙水力劈裂产生较大影响。为探明过渡料特性变化与心墙开裂之间的关系,采用邓肯张E-B模型对庙堂心墙堆石坝进行有限元计算,提出了抗裂安全系数Kn来表征心墙发生水力劈裂的危险程度,并在此基础上采用正交实验的方法比较了过渡料E-B模型各个参数与心墙开裂的相关性,得出结论:过渡料刚度越大,心墙发生水力劈裂可能性越大;在过渡料选择上,应当优先考虑高敏感性因素破坏比(R_(f))、卸荷再填筑时的弹性模量指数(n)、土体内摩擦角(φ_(0))、初始弹性模量(K),在满足沥青混凝土心墙坝设计和施工规范的前提下,选取R_(f)较大,K、φ_(0)较小的过渡料,能够有效提升沥青混凝土心墙坝抗裂性能。The stress level variation of asphalt concrete core walls is not only affected by its material characteristics but also constrained by adjacent transition material characteristics.Changing transition material characteristics will have a significant impact on the hydraulic fracturing of core walls.To explore the relationship between changes in transition material characteristics and core wall cracking,the Duncan-Chang E-B model was used to perform finite element calculations on the Miaotang core wall rock-filldam.A crack resistance safety factor K_(n) was proposed to characterize the risk of hydraulic fracturing in the core wall.Based on this,the orthogonal experimental method was used to compare the correlation between various parameters of the transition material E-B model and core wall cracking.The conclusion was drawn that the greater the stiffness of the transition material,the greater the possibility of hydraulic fracturing in the core wall.In the selection of transition materials,priority should be given to high sensitivity factors R_(f),n,φ_(0) and K.On the premise of meeting the design and construction specifications of asphalt concrete core wall dams,selecting transition materials with larger Rf and smaller K and φ_(0) is beneficial for improving the crack resistance performance of asphalt concrete core wall dams.

关 键 词：沥青混凝土心墙坝 水力劈裂 总应力法 心墙抗裂 安全比例指标 

分 类 号：TV641.41[水利工程—水利水电工程]