南水北调洺河渡槽施工期温控防裂仿真计算  被引量:5

Numerical Simulation of Temperature Control and Anti-cracking Measures for the Ming River Aqueduct of the South-to-North Water Diversion Project

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作  者:夏世法[1,2] 鲁一晖[1,2] 李秀琳[1,2] 耿运生 

机构地区:[1]中国水利水电科学研究院,北京100038 [2]北京中水科海利工程技术有限公司,北京100038 [3]河北省水利水电第二勘测设计研究院,石家庄050021

出  处:《南水北调与水利科技》2012年第4期1-6,共6页South-to-North Water Transfers and Water Science & Technology

基  金:国家自然科学基金项目(50979116)

摘  要:南水北调中线洺河渡槽工程采用C50高性能混凝土,发热速度快,发热量高。对于槽身底板、侧墙、纵梁和横梁等薄壁结构来说,在浇筑早期容易产生表面裂缝,并可能进而发展成为贯穿性裂缝。另外,由于渡槽分两层浇筑,当上层新浇侧墙混凝土温度下降时,受老混凝土约束,容易产生贯穿性裂缝。利用仿真计算遴选不同月份施工时渡槽混凝土的温控措施及温度控制指标,以便反馈设计和指导施工,达到渡槽混凝土施工期防裂的目的,并可为类似工程提供参考。The Ming River aqueduct adopts the high-performance C50 concrete with high speed of heat generation and high calorific value.The surface cracks are prone to occur in the thin concrete structures such as the bottom board,side wall,longeron,and crossbeam during the early period of construction,and they may expand and thus form the throughout cracks.In addition,the aqueduct is divided into two layers.When the temperature of the concrete at the upper side walls drops,the throughout cracks may occur caused by the strong constrictions of the bottom concrete.In this paper,the three-dimensional numerical analysis is conducted to obtain the measures and indexes of temperature control for the aqueduct in different months during the construction period,which can provide the feedback for the design and guidance for the construction and thus prevent the formation of cracks in the concrete.Moreover,the results in this paper can be used as references for other similar projects.

关 键 词:南水北调 洺河渡槽 防裂 仿真计算 温控措施 温控指标 

分 类 号:TV68[水利工程—水利水电工程] TV315

 

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