大古水电站RCC重力坝施工期温控防裂研究  

Research on the Temperature Control and Crack Prevention of RCC Gravity Dam of Dagu Hydropower Station During the Construction Period

作　　者：晏国顺 颉志强[2,3] 陕亮[2,3] YAN Guo-shun;XIE Zhi-qiang;SHAN Liang(HUADIAN Tibet Hydropower Development Co.,Ltd,Lasa 856200,China;Material and Engineering Structure Department,Yangtze River Scientific Research Institute,Wuhan 430010,China;Research Center of Water Engineer Security and Disease Prevention Under Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]华电西藏能源有限公司,拉萨856200 [2]长江科学院材料与结构研究所,武汉430010 [3]长江科学院水利部水工程安全与病害防治工程技术研究中心,武汉430010

出　　处：《中国农村水利水电》2022年第1期183-189,195,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金(51779019,51979011);长江科学院中央级公益性科研院所基本科研业务费项目(CKSF2019407/CL,CKSF2019434/SL)。

摘　　要：大古水电站地处高海拔地区,气候环境复杂,施工期温控防裂是该工程设计施工的关键技术问题。选取5号边坡坝段为研究对象,模拟坝体浇筑全过程,考虑混凝土徐变,采用三维有限元法进行数值模拟仿真计算,研究坝体温度场及应力特性,提出温控防裂措施。研究结果表明,高海拔地区碾压混凝土筑坝,具有低温季节浇筑混凝土上下游坝面开裂风险高,高温季节浇筑混凝土内部后期开裂风险高的特点;采用本文提出的大坝温控防裂措施后,在外部保温与内部通水冷却共同作用下,坝体上下游面及仓面温度变幅明显减小,坝体表面和内部混凝土抗裂安全度均能达到1.8,满足工程设计要求。Dagu Hydropower Station is located in the high altitude area with complex climate environment.Temperature control and crack prevention during construction are the key technical problems in the design and construction of the project.In this paper,5#slope dam section is selected as the research object to simulate the whole process of dam pouring.Considering the concrete creep,the three-dimensional finite element method is used for numerical simulation calculation.The temperature field and stress characteristics of the dam are studied,and the temperature control and crack prevention measures are proposed.The research results show that RCC dam construction in the high altitude area has the characteristics of high risk of cracking on upstream and downstream dam surface when concrete is poured in low temperature seasons and high risk of cracking in internal concrete when concrete is poured in high temperature seasons.After adopting the temperature control and crack prevention measures proposed in this paper,the temperature variation of upstream and downstream dam surface and warehouse surface is significantly reduced under the combined action of external temperature maintenance and internal water cooling.The anticrack safety degree of concrete on the surface and inside of the dam body can reach 1.8,which meets the engineering design requirements.

关 键 词：高海拔地区 RCC重力坝 仿真计算 温控 

分 类 号：TV315[水利工程—水工结构工程]