MODEL TEST ON INFRARED RADIATION FEATURE OF TUNNEL SEEPAGE AND IMAGE PROCESSING
DOU Haitao1，2，HUANG Hongwei1，2，XUE Yadong1，2
(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical
and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China)
Abstract：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.
2011, Vol. 30 
