覆盖层地基非均匀性对重力坝应力和变形的影响规律分析  

Analysis of the influence of non-homogeneous overburden foundation on the stress and deformation of concrete gravity dam

作　　者：袁平[1] 秦于单 方超 王又武[1] 何蕴龙[4] YUAN Ping;QIN Yudan;FANG Chao;WANG Youwu;HE Yunlong(Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410205,China;Sichuan Water Resources and Hydroelectric Investigation&Design Institute,Chengdu 610072,China;PowerChina Huadong Engineering Cor.,Ltd.,Hangzhou 311122,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)

机构地区：[1]中冶长天国际工程有限责任公司,湖南长沙410205 [2]四川省水利水电勘测设计研究院,四川成都610072 [3]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [4]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2021年第8期701-708,共8页Engineering Journal of Wuhan University

摘　　要：针对建于深厚覆盖层上某矿山截洪重力坝常年工况(只在汛期短暂挡水,一年之内大部分时间坝前基本无水)进行分析,探讨覆盖层非均匀性对上部重力坝应力和变形的影响规律。研究结果表明:建于覆盖层上的混凝土重力坝在施工期会产生较大沉降且坝基面沉降明显不均匀,重力坝坝体底部出现顺河向拉应力区;上游侧地基软弱会引起不均匀沉降增大,但对坝体应力无明显不利影响;下游侧地基软弱虽然可以减轻重力坝不均匀沉降,但对坝体应力会产生一定程度的不利影响;横河向地基不均匀对坝体的沉降和应力都会产生明显的不利影响。在覆盖层地基上修建重力坝须注意采用合理的分缝方案,避免将同一坝段修建在横河向跨越力学性质差别较大的覆盖层地基上。The mine flood intercepting dam only keeps water for a short time in flood season, and there is no water in front of the dam for most of the year. Based on the analysis of regular working conditions of a mine flood interception gravity dam built on thick overburden, the influence law of non-homogeneity overburden on the stress and deformation of gravity dam is discussed. The results show that during the construction period, the concrete gravity dam built on the overburden has large settlement, and the settlement of dam foundation is obviously uneven. The horizontal tensile stress zone appears at the bottom of gravity dam. The soft foundation on the upstream side will increase the uneven settlement, but it has no obvious harmful effect on the dam stress.Although the soft foundation on the downstream side can reduce the uneven settlement of the gravity dam, it will have some negetive effects on the stress of the dam. The uneven foundation across the river will have obvious harmful effects on the settlement and stress of the dam. Therefore, it is necessary to adopt reasonable joints for gravity dam construction on overburden foundation, so as to avoid the same dam section being built on the overburden foundation with different mechanical properties across the river direction.

关 键 词：深厚覆盖层 重力坝 非均匀地基 不均匀沉降 水平拉应力 

分 类 号：TV314[水利工程—水工结构工程]