基于多孔介质传热模型探测堤坝渗漏

Study on Dam Leakage Based on Heat Transfer Model of Porous Medium

岩土体发生渗漏,集中渗漏通道内的流体与岩土体会发生热量交换,造成渗流通道附近地层温度发生改变.结合集中渗漏通道自身特点将渗漏通道视为多孔介质通道,考虑固相和流相相互作用的能量耗散和流体流动方向的传热效应,基于饱和多孔介质能量方程建立流体在多孔介质通道中的传热模型.根据确定的边界条件,利用叠加原理和分离变量法得到多孔介质在局部热平衡时温度的解析解.将该模型应用于工程实际,将工程实测的温度数据及参数代入模型,反演出渗漏流速.结果表明,所建立的传热模型是可行的.

When an embankment or dam media has a concentrated leakage passage,the heat exchange with groundwaterand rock media will occur around concentrated leakage passage,and this leads temperature altering in the stratumnear leakage passage. Based on its own characteristics,the concentrated leakage passage can be regarded as a porousmedium passage,taking into effect of energy dissipation due to the interaction between solid skeleton and pore fluidflow and heat transfer in the direction of the fluid flow,heat transfer model in the dam is presented based on theenergy equation of the fluid-saturated porous medium. According to the determined boundary conditions,the expressionsof temperature can be obtained by means of the superposition principle and method of separation of variables. Themodel has been applied to a practical example,the field test temperature data is entered into the model,and aninverse calculation method is set up to obtain leakage velocity. The result of comparison of theoretical and practicalvalues show that the heat transfer model is feasible.