利用红外热像技术探测土石坝集中渗漏的研究

为了探究利用红外热像技术探测土石坝集中渗漏隐患的可行性,在实验室内制作均质土石坝集中渗漏模型。采用热红外灯作为热激励模拟太阳光照,利用M7500型红外热像仪测量模型表面的温度场。实验结果显示,在热激励下,模型表面温度升高;但是土石坝模型表面集中渗漏区域的温度比正常区域要低。实验中采用了不同的水头,随着水头的提高,温度场的异常变得更明显。利用Geostudio有限元软件进行土石坝集中渗漏的渗流场温度场耦合分析。数值模拟的结果显示,集中渗漏区的坡面温度比正常区域要低,水头提高时,这种温度场的异常也更明显。数值分析结果显示,渗漏区的流速比正常区域要大,这可能是温度场出现异常的原因,红外热像技术通过检测表面温度场的异常来探测土石坝集中渗漏隐患具有可行性。

Study on detecting concentrated leakage in earth-rock dam by infrered imaging technique

In order to detecting concentrated leakage in earth-rock dam by infrared imaging technique, adopting soil make a model dam with concentrated leakage risk, and use a infrared radiation as heat source Simulating the sunlight, the surface temperature of model dam is measured by infrared thermal imaging instrument M7500. It is shown that the surface temperature increase after heated, but the region with concentrated leakage is lower than normal region.With the increase of hydraulic head, the?abnormity of temperature field becomes more apparent. We use Geostudio for seepage field and temperature field coupling numerical simulation, the results show that the region with concentrated leakage is lower than other normal region, the increase of hydraulic head widen the gap. Numerical analysis also show that seepage velocity of leakage region is lager than normal region ,it may cause the temperature gap. Infrared imaging technique measure the surface temperature and the abnormity, may be feasible for detecting concentrated leakage in earth-rock dam.