基于现场试验的混凝土坝块散热分析  

In-situ experiment-based analysis on heat dissipation of concrete dam block

作　　者：王继敏 胡书红 魏宝龙 朱振泱[2] 张磊[2] 刘毅[2] WANG Jimin;HU Shuhong;WEI Baolong;ZHU Zhenyang;ZHANG Lei;LIU Yi(Yalong River Hydropower Development Co.,Ltd.,Chengdu 610051,Sichuan,China;State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]雅砻江流域水电开发有限公司,四川成都610051 [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：《水利水电技术（中英文）》2022年第8期88-100,共13页Water Resources and Hydropower Engineering

基　　金：国家重点研发计划项目(2018YFC0406703);国家自然科学基金项目(51779277,51779276)。

摘　　要：考虑到层间散热对混凝土浇筑块温度的影响,早期混凝土坝工程严格限制浇筑层厚度以保障温控效果。近期的大型混凝土坝工程均采取较为严格的浇筑温度控制措施和通水冷却措施,因此层间散热对混凝土块温度的影响较以往工程已大幅削减。为研究混凝土浇筑层厚度对温控防裂的影响,对3.0 m和4.5 m层厚混凝土浇筑块的温度场进行精确重构,并依托一种可定量计算混凝土散热量的方法,进行混凝土块散热精确分析。基于试验和理论分析,分别定量地计算仓面、上下游表面、新老混凝土面和通水冷却的散热量,精确定量地对比了层间散热和通水冷却等温控措施的温控效果。结果表明,对于有着严格控制浇筑温度和智能通水的大坝工程,浇筑间歇期的仓面散热已经不再是混凝土块散热的主要途径,合理的浇筑温度和通水冷却措施可以解决由浇筑层厚度增加造成的表面散热不足所带来的温控防裂问题。考虑到厚层浇筑能有效减少仓面的数量,该措施不仅可实现大坝混凝土快速均衡浇筑,还可有效地控制混凝土仓面裂缝所造成的不利影响,在施工效率得以保障的情况下,厚层浇筑对大型混凝土工程的温控防裂是有利的。At present, more strict concrete placing temperature control measures and water cooling measures are adopted for all the projects of large-scale concrete dam, and then the influence of interlayer heat dissipation on concrete block temperature is greatly reduced if compared with that from the previous projects. Therefore, the temperature fields of the concrete blocks with the layer thicknesses of 3.0 m and 4.5 m are accurately rebuilt with an advanced inversion analysis method of temperature field, and then an accurate analysis of heat dissipation of concrete block is carried out in combination with the relevant in-situ experiment by means of relying on a method for quantitative calculation of concrete heat dissipation. Based on the relevant experiment and theoretical analysis, the concrete placing face, both the upstream and the downstream surfaces, new and old concrete faces and the heat dissipation from water cooling are quantitatively calculated respectively, while the temperature control effects of interlayer heat dissipation, water cooling, etc. are accurately and quantitatively compared as well. The study results show that the heat dissipation of the concrete placing face during the placing interval is no longer the main way to reduce the temperature of the concrete block for the dam construction project with strict control of concrete placing temperature and intelligent cooling water supply, while the problem of temperature control and crack prevention caused by the insufficient surface heat dissipation from the increase of the concrete placing layer thickness can be solved by the reasonable concrete placing temperature and water cooling measures. The consideration of thick layer concrete placement can effectively decrease the number of the concrete placing faces, and then can not only realize the quick and balanced placement of concrete, but also can effectively control the adverse influence caused by the cracking of concrete placing face. Under the condition that the construction efficiency can be guaran

关 键 词：混凝土坝 散热 浇筑层厚度 温控防裂 

分 类 号：TV642[水利工程—水利水电工程]