The Behavior of Residual Pore Water Pressure on Reservoir Limb Landslide due to Drawdown of Dam Reservoir Level

Abstract

In order to estimate the residual porewater pressure of landslide due to rapid drawdown of reservoir level rationally, the behavior of groundwater is observed and analized for 16 landslides, their geology is crystalline shist, Mesozoic-Paleozoic sedimentary rock, and Ryoke granite. The observed data show that the groundwater residual ratio is below 20 percent at drawdown speed 0.5-0.8 meter per day, and the residual ratio depends on geological characteristics of slip block. To use the result, we can estimate the groundwater residual ratio rationally.