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

摘要： 渗漏病害是引起库坝失稳及兴利库容降低的主要因素之一,库坝的规划、建设和运管均离不开对渗漏问题的考量。土石坝在我国各类大坝中占比约92%,也是渗漏发生的偏向型坝型。开展土石坝渗漏病害探测应用研究,对渗漏进行通道展示、成因分析及影响评估,可为土石坝除险加固提供重要依据。文中以四川省金堂县某水库为例,采用地面物探及孔内测试相结合的方式,对大坝进行了全方位探测。结果表明库内存在2个主要的渗漏入水口,水沿着顺河向裂隙经坝基绕过防渗心墙以承压水的形式向背水侧渗漏,东风水库渗漏病害处理的关键在于阻断左侧坝基裂隙型渗漏通道。

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