堤坝管涌渗漏有限长线热源模拟与试验  

Study on piping leakage of dam with limited-length line heat source model and experiment

作　　者：董海洲[1] 刘洋[1] 张小燕[1] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098

出　　处：《水利学报》2012年第8期1004-1008,共5页Journal of Hydraulic Engineering

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

摘　　要：堤坝管涌水渗漏改变渗径周围岩土体的原始温度场分布,由此将管涌通道虚拟为一个有限长线热源,引入热传导理论中的热源函数描述这种温度响应,通过虚拟热源法与映像法建立管涌水传热模型。由于渗漏水流速、水温决定了线热源的发热率,据此可以依据实测温度数据、地层介质热物性参数以及测量点空间位置,确定出发热率并反推求出渗漏流速。通过室内试验,在不同工况下模拟渗漏水对岩土介质温度场的影响,模型计算值与试验设定值吻合较好。Piping water from dam will change original temperature distribution of ambient geo-materials along the leakage pathway. The piping channel can be regarded as a limited-length line heat source, so heat source function, an item usually used in heat conduction theory, is introduced to describe such a temperature variation. Eventually, a piping water heat conduction model is established combining virtual heat source method and image method. The heat generation rate of this virtual line source is determined by velocity and temperature of leaking water. Based on measured temperature, thermophysical parameter of strata material and spatial coordinates of measuring points, such heat generation rate can be calculated and piping velocity can be obtained by reverse deduction. A laboratory experiment has been carried out to modeling the influence of leaking water to temperature field of ambient geo-materials under different conditions. The difference between model value and test value is rather small.

关 键 词：堤坝 管涌 虚拟热源法 映像法 渗漏流速 

分 类 号：TV698.12[水利工程—水利水电工程]