The development of pore water pressures is an important issue in the behaviour of landslides under rainfall infiltration. Thus, the understanding of groundwater flow is an important achievement. The modelling of these rainfall events has been attempted so as to develop a system to predict large movements in landslides triggered by rainfall.The aim of this paper is the presentation of the results obtained in the groundwater flow modelling of Vallcebre landslide (Eastern Pyrenees) under both saturated and unsaturated conditions. This is a traslational landslide with two clay layers sliding over a limestone bed. The movements are concentrated in the deepest clay layer. There are some scarps and extension zones along the landslide. Some high intensity rainfall events cause a fast raising of water levels and a reactivation of movements. This behaviour has been verified in the monitoring devices: inclinometers, wire extensometers and piezometers in the landslide zone and a rain gauge in the basin of Vallcebre. A GPS survey device is also monitoring surface movements.The landslide has been modelled by the finite element method and some rainfall events have been tested to calibrate some flow parameters like permeability or storativity. Also, an inverse analysis has been performed in order to estimate in a systematic manner those parameters. The model has been attempted in both two-dimensional and three-dimensional analyses. The effect of preferential flow paths produced by tension cracks has been included in the model as well. The results of the analyses are consistent with the measurements, and show the importance of preferential flow paths and boundary conditions on the simulation of the landslide behaviour.
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- Groundwater Flow Modelling of a Landslide
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