IMPROVEMENT OF ARCH ACTION AT CLAY CORE-WALL OF HIGH ROCKFILL DAM BY UNITED SEEPAGE CONCROL WITH GEOMEMBRANE

摘要

In this paper, the stress, strain, and seepage of a high rock-fill dam with clay core on the sand-gravel foundation is numerically simulated with FLAC3D software. United seepage control with Geomembrane and disfigurement clay core in high rock-fill dam is a new design idea. The study result shows that the united seepage control measure not only can greatly lower the phreatic water surface in clay core but also can weaken the arch-action effectively which may result in horizontal cracks in clay core. In addition, the adoption of this kind of united seepage control measure can avoid the phenomenon that the maximum principal stress is less than pore pressure at the same elevation and improve the safety of clay core in mechanical and hydraulic ways.