貯水位変動に伴う斜面内の浸透挙動に関する研究

Abstract

Fill-type dams for power generation and irrigation purposes have often experienced severe damages of slope failure due to a rapid draw down of the reservoir water in seasons of full operation. This paper concerns seepage flow behavior in earth slopes, development of the phreatic surface and distribution of pore water pressure in the dam body and their influence on slop instability, due to the change in the upstream water level in the reservoir. Centrifuge model tests and associated FEM saturated-unsaturated seepage analyses were carried out on several model earth fills to discuss and propose an appropriate procedure of stability evaluation of slopes. The results showed that a close agreement is achieved between the behavior in centrifuge model tests and that in FEM analyses, and that the FEM seepage analysis procedure can be used as a useful tool to predict the actual behavior of earth fill dams.