大古水电站大坝岸坡坝段温度应力特性及浇筑温度影响分析  

An Analysis of the Temperature Stress Characteristics and Pouring Temperature Influence of Bank Slope Dam Section of DG Hydropower Station

作　　者：陈亮 颉志强[2,3] 王首豪 CHEN Liang;XIE Zhi-qiang;WANG Shou-hao(Huadian Tibet Hydropower Development Co.,Ltd,Lasa 856200,China;Yangtze River Scientific Research Institute,Wuhan 430010,China;Research Center for Water Engineering Safety and Disaster Prevention,Ministry of Water Resources,Wuhan 430010,China)

机构地区：[1]华电西藏能源有限公司大古水电分公司,拉萨856200 [2]长江水利委员会长江科学院,武汉430010 [3]国家大坝安全工程技术研究中心,武汉430010

出　　处：《中国农村水利水电》2022年第5期209-215,共7页China Rural Water and Hydropower

基　　金：国家自然科学基金青年基金项目(51509020,52009011);中央级公益性科研院所基本科研业务费项目(CKSF2019394/GC,CKSF2021455/CL)。

摘　　要：研究和实践表明,控温浇筑与表面保温、通水降温都是重要的混凝土大坝施工防裂措施。然而,严格的浇筑温度控制指标,大多需要骨料风冷及加冰拌和来实现,会大幅增加混凝土生产成本。以地处高海拔地区的大古水电站岸坡坝段为研究对象,采用三维有限元法,系统研究了岸坡坝段混凝土施工期温度、应力及开裂特性。在此基础上,通过多工况仿真,比较了浇筑温度对岸坡坝段不同部位开裂特性的影响。结果表明,对于该工程而言,上下游面机拌变态混凝土需要严格控制浇筑温度,但坝体内部碾压混凝土浇筑温度可在设计指标基础上适当提高2~5℃。Research and engineering practice show that pouring temperature control is as important as surface insulation and water cooling for cracking-preventing of the concrete dam.However,most of the strict pouring temperature control indicators need the air cooling and ice mixing of aggregates,which will greatly increase the cost of concrete production.Taking the RCC dam bank slope dam section of DG hydropower station located at high altitude as the research object,this paper systematically studies the temperature,stress and cracking characteristics of the bank slope dam section concrete during construction by using the three-dimensional finite element method.On this basis,the effects of pouring temperature on the cracking characteristics of different parts of the dam are compared through multi-condition simulation.The results show that for the project,the pouring temperature of machine mixed abnormal concrete on the upstream and downstream surfaces needs to be strictly controlled,but the pouring temperature of RCC in the dam body can appropriately increase by 2~5℃based on the design index.

关 键 词：碾压混凝土 岸坡坝段 温度应力 浇筑温度 

分 类 号：TV315[水利工程—水工结构工程]