水电站厂房大体积混凝土温度应力分析与防裂措施  

Analysis of thermal stresses and crack control measures in mass concrete of hydropower station powerhouse

作　　者：丁兵勇[1] 杨忠良[1] 唐瑜莲[2] 陈守开[3] 安晓伟[3] 

机构地区：[1]华东勘测设计研究院有限公司,杭州310014 [2]浙江省水利水电技术咨询中心,杭州310020 [3]华北水利水电大学水利学院,郑州450045

出　　处：《南水北调与水利科技》2015年第2期362-365,共4页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金资助项目(51109081;51309101)

摘　　要：针对厂房混凝土结构施工期易开裂的问题,采用三维非稳定温度场及应力场的有限元计算方法,对某水电站厂房下部大体积混凝土结构的施工全过程进行数值模拟,揭示其温度场及应力场的发展过程和分布规律,并根据计算结果提出切实可行的温控防裂措施。经分析发现,在低温入仓的基础上,采取表面保温和内部导热降温相结合的温控防裂措施,可有效降低混凝土早期的内外温差和后期的温降幅度,从而提高厂房混凝土的抗裂安全性。The concrete structure of hydropower station powerhouse can easily crack during the construction period.In this paper,three-dimensional finite element method with unsteady temperature and stress field was used to simulate the whole construction process of the under part concrete structure of a hydropower station powerhouse.The development process and distribution regularity of the temperature field and stress field were obtained,and the feasible temperature control and crack prevention methods were proposed according to the computation results.The analysis showed that on the basis of low temperature before concrete pouring,temperature control and crack prevention measures with surface heat preservation and internal heat conduction can effectively decrease the temperature difference between the internal and external early-age concrete,and also decrease the temperature amplitude of later-age concrete,which can improve the safety against cracking of the powerhouse concrete.

关 键 词：水电站厂房 大体积混凝土 有限元 温度应力 温控防裂 

分 类 号：TU755[建筑科学—建筑技术科学]