隧道渗漏水红外辐射特征模型试验及图像处理

 对室外大型混凝土模型墙体注水模拟隧道衬砌渗漏水，利用红外热像仪观测渗漏水的红外辐射特征，获取红外热图像，研究混凝土渗漏水过程中的红外辐射规律，并编写MATLAB图像处理程序提取混凝土渗漏水红外热图像特征。混凝土一般渗漏水试验结果表明：渗漏水热图像呈现高温区域包围低温区域的温度场特征，渗漏水区域边缘温度梯度较大；混凝土渗漏水过程试验结果表明：渗水流量越大，渗漏水区域和基底混凝土的红外辐射温差越大，水域温度越均匀，水域边缘温度场变化越剧烈；试验结果可以为混凝土工程(如地下建筑、隧道等)渗漏水的检测和预警提供指导。针对渗漏水红外图像特征，利用MATLAB编写的程序能够提取热图像中的渗水面积等信息，为隧道渗漏水车载动态检测软件系统开发奠定基础。

MODEL TEST ON INFRARED RADIATION FEATURE OF TUNNEL SEEPAGE AND IMAGE PROCESSING

To study the infrared radiation(IR) features of water seepage in tunnel，water seepage is simulated on an outdoor concrete wall model and IR is measured using an IR thermal imager. The image feature of water seepage is extracted from IR image with a program written in MATLAB. The general experimental results of water seepage show that：thermal image shows temperature field characteristics of high-temperature region surrounded by low-temperature region and a clear interface of water seepage and concrete basement with large temperature gradient. The experimental results of water seepage process show that：the larger water seepage flow is，the larger temperature difference between water seepage and concrete basement is，the more uniform temperature in water region is and the more intense temperature in the water seepage region edge is. The experimental results are useful for water seepage detection and forecasting on concrete projects(such as geotechnical engineering，tunnels，etc.). For IR image features of water seepage，the seepage area and other information are extracted from IR image with a program written in MATLAB. The results lay the foundation for software system development of tunnel water seepage detection on movement.