某土石坝悬挂式混凝土防渗墙深度优选.

When earth-rock dams are built on deep overburden layers, the seepage prevention effect of dam body and dam foundation is directly related to the safety of dam. According to the geological conditions of an earth-rock dam in the southwestern region of China, the dam body adopted the asphalt concrete core wall to prevent seepage, and the deep overburden layer adopted the suspended concrete anti-seepage wall scheme, focusing on the depth of hanging concrete cutoff wall for 6 kinds of scheme comparison and analysis and determining that when the depth of the cutoff wall was 22 m, the annual seepage flow and seepage ratio drop of the dam and dam foundation met the requirements. On this basis, a number of working conditions were checked and analyzed. The calculation results show that the anti-seepage system based on the asphalt concrete core wall and impervious wall effectively reduces the height of the internal seepage line of the dam, and the saturation line dips at the asphalt concrete core wall, and the internal pore water pressure of the downstream dam slope is relatively small, the maximum dam height where the saturation line falls to the drainage layer and the downstream exit point is located in the lower part of the downstream drainage body. The seepage ratio drop of asphalt concrete core wall and concrete cutoff wall is less than the allowable value of 80 and the seepage ratio drop of the dam filling material and the natural gravel layer is within the allowable percolation drop range. The seepage in the dam body and the dam foundation is stable and no seepage damage will be occurred. [ABSTRACT FROM AUTHOR]