关键词: 伪随机流场法, 瞬变电磁法, 钻孔全景数字成像, 渗漏成因, 渗漏通道

Abstract: Leakage disease is one of the main factors that cause the instability and the reduction of utilizable capacity of reservoir and dam. The whole life cycle of reservoir and dam can not be isolated from the consideration of leakage problem. Earth-rock dam, which accounts for about 92% of all kinds of dams in our country, is also a biased dam type where leakage occurs. It is an important basis for earth-rock dam to carry out the application research on the detection technology of leakage disease, to show the leakage channel and analyze the cause and evaluate the impact. Taking Dongfeng Reservoir in Jintang County, Sichuan Province as an example, a comprehensive detection of the dam was carried out by the combination of ground geophysical exploration and in-hole testing. The detection results show that there are two main water intakes in the reservoir. The water flows along fissure towards river direction,bypass the impermeable core wall,passes through the dam foundation in the form of confined water, and leaks to the back side at last. The guiding significance of the detection results is as follows: the key to deal with the leakage disease of Dongfeng reservoir is to block the fissure leakage channel in the dam foundation, especially on the left side.

Key words: pseudo-random flow field method, transient electromagnetic method, borehole panoramic digital imaging, leakage causes, leakage passage