狭窄河谷中混凝土面板坝的应力变形规律及工程措施研究  

Study on stress and deformation and engineering measures for concrete faced rockfill dam built in narrow valley

作　　者：徐泽平[1,3] 陆希 翟迎春[2] 严祖文[1,3] 姬阳[2] 徐耀 XU Zeping;LU Xi;ZAI Yingchun;YAN Zuwen;JI Yang;XU Yao(China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Northwest Engineering Corporation Limited,Power China,Xi’an 710065,China;State key Laboratory of Simulation and Regulation of Water Cycle in River Basin,Beijing 100038,China;Beijing IWHR-KHL Co.,Ltd,Beijing 100038,China)

机构地区：[1]中国水利水电科学研究院,北京100038 [2]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [3]流域水循环模拟与调控国家重点实验室,北京100038 [4]北京中水科海利工程技术有限公司,北京100038

出　　处：《水利学报》2022年第12期1397-1409,共13页Journal of Hydraulic Engineering

基　　金：西藏自治区科技计划项目(XZ202101ZY0002G);中国水科院基本科研业务费专项(SM0145B022021)。

摘　　要：为深入了解河谷地形因素对混凝土面板堆石坝应力变形特性的影响,采用一个典型的混凝土面板堆石坝三维有限元模型进行了不同岸坡坡度与河床宽度等影响因子的分析研究,并在总结已有相关研究成果的基础上,结合工程实例,探讨了改善峡谷地区混凝土面板堆石坝应力变形特性的工程措施。研究成果表明:河谷地形对大坝的作用主要表现在岸坡对坝体和面板的约束及顶托作用,这种作用随大坝长高比的增加而减弱。对于修建于狭窄河谷中的面板坝,其堆石体位移梯度和面板的压应力数值相对较大。工程上可采取提高堆石体压实密度,设置岸坡增模堆石区,以及合理确定面板浇筑时机和设置可吸收变形的面板纵缝填充材料等措施,以控制坝体变形并改善面板的应力状态。In order to study the impacts of topography of river valley on the stress and deformation properties of concrete faced rockfill dam(CFRD),an ideal 3D finite element model was used for stress and deformation analysis.Based on the studies and the analysis of a real CFRD project,engineering measures for improving the stress and deformation status of CFRD built in narrow valley are proposed.Research results reveal that the main effects of river valley on CFRD are the restraint and supporting action of abutments on dam body and concrete face slabs,and this effect will be reduced with the increase of the valley shape factor,i.e.the ratio of crest length to the height of the dam.For CFRD built in a narrow valley,the displacement gradient of rockfill and the compressive stress of face slabs are relatively large.Engineering measures such as increasing the compaction density of rockfill,setting up the transition rockfill zone with increased modulus,reasonably determining the timing for face slab construction,and arranging filling material with the capacity to absorb the deformation of face slabs in vertical joints of the slabs,can be taken to improve the stress and deformation status of the dam and the face slab.

关 键 词：混凝土面板堆石坝 河谷性状 应力变形 狭窄河谷 

分 类 号：TV641.4[水利工程—水利水电工程]