快速浇筑情况下随机因素对混凝土坝开裂影响分析  

Influence Analysis of Random Factors on Concrete Dam Cracking under Rapid Construction

作　　者：王海波[1] 王仁坤[1] 宋猛[1] 

机构地区：[1]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《水力发电》2013年第7期30-32,54,共4页Water Power

基　　金：国家自然科学基金资助项目(50779010)

摘　　要：混凝土坝厚浇筑层、短间歇期、均匀连续快速施工方法的应用对加快混凝土坝建设进度、施工节资意义重大,但采用快速施工方法引起的混凝土坝仓面裂缝问题值得重视。以某在建混凝土重力坝为例,分析与探讨了低温浇筑及长间歇、气温骤降等随机因素下,快速浇筑混凝土坝仓面的应力特性和裂缝机理,对早龄期混凝土坝仓面开裂风险进行了深入分析研究,提出以温度的空间梯度和时间梯度作为混凝土开裂风险的判别指标更为合理。The rapid construction method of thick-layer pouring and shorter interval can significantly sped up concrete dam construction and save construction costs, but the problems of concrete surface cracking caused by this method should be paid enough attention. Taking a concrete gravity dam under construction as case study, the stress characteristic and cracking mechanism of concrete surface and the cracking risk at early age under the conditions of concrete pouring with a low temperature and long interval are analyzed. This study show that taking spatial and time gradients of temperature as discrimination index of concrete cracking risk is more reasonable.

关 键 词：混凝土坝 快速浇筑 随机因素 开裂 

分 类 号：TV315[水利工程—水工结构工程]