坝基双集中渗漏通道传热模型及流速反演研究  

Study on Double-concentrated-leakage Passage Heat Conduction Model and Retrieval of Velocity in Dam Basement

作　　者：董海洲[1] 罗日洪[2] 张令[2] 高彬[2] 张小燕 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098 [2]河海大学土木与交通学院,江苏南京210098 [3]宏润建设集团设计院,上海200235

出　　处：《四川大学学报（工程科学版）》2012年第3期36-41,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50809024);江苏省自然科学基金资助项目(BK2009343);中央高校基本科研业务费专项资金资助(2009B12214)

摘　　要：堤坝集中渗漏通道可虚拟为持续线热源,通过线热源函数建立传热模型进行渗漏定量计算。针对现有线热源模型的一些局限,考虑在以下2个方面进行改进:1)线热源为有限长;2)热源强度是沿程变化的。而且实际地质条件下常有双通道或多通道渗漏的状况,此时现有的单通道传热模型已不适用。在此基础上应用虚拟热源法叠加原理建立了在半无限大介质中有限长双渗漏通道的传热模型,推导出其解析解,并提出了基于此模型对流速进行反演的系统方法。由此设计了一套室内实验系统对双集中渗漏通道传热模型在不同工况下的温度场进行模拟,并将理论计算值与实验实测值进行比较。结果表明,所建立的传热模型和所提出的流速反演方法是可行的。Regarding concentrated leakage passage in dam basement as a continuous line-heat source, a heat conduction model was pro- posed by using line-heat source function. Moreover,to overcome the limitations of previous research, the length of the line-heat source was considered as limited, and the heat release rate of line source as changing along the leakage path. Then based on dummy heat source method and superposition method, a heat conduction model of double concentrated leakage passage with limited length was proposed and its analytical solution was derived. Eventually, an inverse calculation method was set up to obtain leakage velocity. Mean while, a laboratory experiment under different operating conditions was designed to model temperature field. The resuh of comparison of theoretical and measurement values showed that the heat conduction model proposed in this paper and its velocity inversion are precise and feasible.

关 键 词：渗漏通道 虚拟热源法 传热模型 实验模拟 流速反演 

分 类 号：TV223.4[水利工程—水工结构工程]