关键词: 高混凝土面板堆石坝, 渗流量, 增大

Abstract: The measured total seepage of a high concrete face rock-fill dam in 2014 is significantly larger than in history. The increase of rainfall in 2014 is not the main reason by excluding its impact. By regression analysis and study of the water level change of collecting well downstream the dam, the conclusion is obtained that the seepage increase is not in a sudden but a gradual increasing process since 2005. Based on the underwater inspection results, it is gotten that the reasons for seepage increase are as following: cutting groove and setting soft seam on concrete face, as well as extrusion damage of vertical seam which leads to the leakage channel between the copper water-stop and concrete face.

Key words: high concrete face rock-fill dam, seepage, increase