大坝混凝土通水冷却方式和表面保温力度研究  

Study on Water Cooling Mode and Surface Thermal Insulation Strength of Dam Concrete

作　　者：许继刚 王振红[2] 汪娟 李辉[2] XU Jigang;WANG Zhenhong;WANG Juan;LI Hui(Guodian Dadu River Jinchuan Hydropower Construction Co.,Ltd.,Jinchuan 624100,China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]国电大渡河金川水电建设有限公司,四川金川624100 [2]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100038

出　　处：《人民黄河》2020年第10期134-141,共8页Yellow River

基　　金：国家重点研发计划项目(2018YFC0406703);国家自然科学基金资助项目(51779277);中国水科院科研专项(SS0145B712017,SS0145B612017,SS0145B392016);流域水循环模拟与调控国家重点实验室自主研究课题(SKL2020ZY10);水利部先进实用技术示范项目(SF-201701)。

摘　　要：西藏高原地域辽阔,处于世界屋脊之上,水电资源十分丰富,但是西藏高原地区环境艰苦、地质条件复杂,再加上气候干燥、冬寒夏凉、日温差大和太阳辐射强等恶劣的气象条件,在这类地区修筑大坝将面临着巨大挑战,特别是大坝混凝土的温控防裂问题。冷却水管和表面保温是大体积混凝土温控防裂的主要方法,将通水冷却分三期进行,全过程降温控制,联合大坝的适度保温,可起到很好的温控防裂效果。以西藏地区某大坝为依托,借助三维有限单元法,对不同的水管冷却方式和表面保温力度进行研究,得出适合高海拔地区混凝土大坝施工期的温控防裂措施标准。The vast Tibet Plateau,which is also called“the Roof of the World”,is rich in water resources.However,the area is character⁃ized by a difficult environment,complex geological conditions,as well as dry climate,extremely cold winter and cool summer,large diurnal temperature difference,strong solar radiation and other severe weather conditions.Thus,dam construction in the area faces enormous challen⁃ges,particularly the issues of concrete temperature control and crack prevention.Water pipe cooling combined with surface heat preservation is the main method of temperature control and crack prevention for mass concrete.However,good temperature control and crack prevention can be achieved through three phases of water cooling,cooling control in the entire process and moderate heat preservation of the dam.This study investigated the various water pipe cooling modes and surface heat preservation strengths of a dam in Tibet by means of three⁃dimension⁃al finite element method and obtained the temperature control measures and standards suitable to dam during construction in this area.The method and concept were significant in constructing the same type of projects in other high⁃altitude areas.

关 键 词：大坝 温控防裂 冷却水管 表面保温 西藏高原 

分 类 号：TV315[水利工程—水工结构工程]