2014 Volume 51 Issue 4 Pages 121-131
In general, a seepage model of groundwater is calibrated through simulation of the monitored groundwater levels. However, it is often difficult to simulate groundwater levels of an area, including landslides, which tend to be scattered in both time and space due to irregular groundwater flow through inhomogeneous landslide mass. This paper describes one approach to appraise the distribution of groundwater that may be inducing the movements of the Jinnosuke-dani landslide, using 3D seepage model. First, emphasis was placed on close observation of the monitored data to find groundwater levels that exhibit similar trend in time. Furthermore, correlation between the groundwater levels, showing similarity, and the displacements suggests that it is possible to locate the groundwater tables that may be one of the triggering sources. Three dimensional seepage simulations were then performed to reproduce the measured groundwater levels. The simulated groundwater levels and estimated hydraulic properties are used in appraising the hypothetical mechanism of the movements suggested by the measurements.
