双层堤基异常渗漏对堤防温度场分布的影响研究

Study on the effect of abnormal seepage on temperature field distribution of embankment

通过对双层堤基异常渗漏险情作用下的温度场进行分析计算,结果表明,渗流场对堤防内部的温度场分布具有重要影响,当覆盖层中薄弱环节的渗透系数超过粉砂以后,即可在渗漏通道出口观测到明显的低温区,并且该低温区受气温变化的影响较小,因此,通过监测堤防背水侧地面温度的异常变化进而探测出异常渗漏险情在技术上具有一定的可行性,并且在异常渗漏险情发生和发展的早期即可成功探测到,有利于实现"抢早抢小"的目标。研究成果可以为堤防渗漏险情快速遥感探测技术的进一步研发提供一定的理论支撑。

Temperature fields affected by abnormal seepage in a typical cross section with two-stratum dike foundations are studied and the results show that seepage field has an important influence on the distribu tion of temperature field in embankment and an obvious low temperature zone can be observed at the out let of the concentrated seepage passage when its permeability coefficient exceeds that of silt sand.The study also finds that the low temperature zone is scarcely affected by the change of air temperature.The conclusions are that detecting destruction risk of embankment due to abnormal seepage by monitoring the low temperature zone at the back of dike is technically feasible,and this kind of risks can be detected in their very early stages so that the goal of“early risk-elimination”can be achieved.The research results can provide some theoretical support for the further development of fast remote sensing detection technology for abnormal seepage risk in embankment.