基于温控仿真的碾压混凝土重力坝防裂措施研究  

Research on crack prevention measures for RCC gravity dam based on temperature control simulation

作　　者：周顺田 张健 刘东旭 王振红[2] 汪娟 李辉[2] ZHOU Shuntian;ZHANG Jian;LIU Xudong;WANG Zhenhong;WANG Juan;LI Hui(Huadian Fuxin Zhouning Pumped Storage Co.,Ltd.,Ningde 352100,China;Department of Structures and Materials,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]华电福新周宁抽水蓄能有限公司,福建宁德352100 [2]中国水利水电科学研究院结构材料研究所,北京100038

出　　处：《人民长江》2022年第3期144-148,共5页Yangtze River

基　　金：国家重点研发计划项目(2018YFC0406700);国家自然科学基金项目(51779277);中国水科院科研专项(SS0145B712017,SS0145B612017,SS0145B392016);乌东德温度应力试验项目(WDD0428)。

摘　　要：温度荷载是混凝土重力坝的一个主要荷载,它的大小直接影响着大坝是否产生温度裂缝,进而影响着大坝的安全稳定运行。碾压混凝土坝由于胶凝材料用量少、混凝土温升较低,温控措施往往认为可以简化或者取消,但工程经验表明,碾压混凝土重力坝施工过程中温控措施仍必不可少。以福建省周宁电站碾压混凝土重力坝为例,借助三维有限单元法,探讨了有无控温措施的区别,同时对浇筑温度和表面保温关键温控参数开展敏感性分析。计算结果表明:不采取温控措施不能满足温控要求,浇筑温度降低和适度表面保温可以起到较好的温控防裂作用。该工程的温控防裂方法和思路对类似工程的温控防裂具有重要参考意义。Temperature load is one of the main loads of RCC dams,its value directly affects whether the dam produces temperature cracks,and affects the safe and stable operation of the dam.Due to the small amount of cementing material and low concrete temperature rise in RCC dams,temperature control measures are often considered to be simplified or eliminated.However engineering experiences show that temperature control measures are indispensable during the construction of RCC gravity dams.Taking Zhouning RCC gravity dam as an example,using three-dimensional finite element method,we discussed the difference between presence and absence of temperature control measures.At the same time,the sensitivity analysis on the pouring temperature and the key temperature control parameters of the surface insulation were carried out to study its effect on the dam temperature and the degree of influence of temperature stress.The calculation results showed that temperature control requirements could not be met without temperature control measures,and lower pouring temperature and appropriate surface insulation could play a better role in temperature control and crack prevention.The temperature control and crack prevention measures and ideas used in this project can provide significant reference value for the temperature control and crack prevention of similar projects.

关 键 词：碾压混凝土 温控仿真 浇筑温度 表面保温 防裂措施 

分 类 号：TV315[水利工程—水工结构工程]