Modelling the behaviour of a large landslide with respect to hydrogeological and geomechanical parameter heterogeneity |
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| Authors: | Laurent Tacher Christophe Bonnard Lyesse Laloui Aurèle Parriaux |
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| Institution: | (1) Laboratory of Engineering and Environmental Geology (GEOLEP), Institute of infrastructures, resources and environment, Swiss Federal Institute of Technology Lausanne, EPFL- ICARE, CH-1015 Lausanne, Switzerland;(2) Laboratory of Soil Mechanics (LMS), Institute of infrastructures, resources and environment, Swiss Federal Institute of Technology Lausanne, EPFL- ICARE, CH-1015 Lausanne, Switzerland |
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| Abstract: | Thanks to a sophisticated transient hydrogeological modelling allowing the determination of the pore pressure fields in La Frasse landslide mass during a crisis, it has been possible to model the mechanical behaviour of the slide and obtain results that prove to be similar to the monitored data, in terms of peak velocity, distribution of velocity with time and space and total displacements. Such results are reached only when appropriate constitutive modelling laws are used, and when geotechnical tests supply all the required parameters. The main results concern the potential effect of a drainage system during a crisis, like the one experienced in 1994. It can include vertical boreholes equipped with pumps or drains drilled from a gallery. The draining system reduces horizontal displacements down to 5% of the values modelled during the crisis. This effect, which appears to extend over a large width, will be even more significant if the boreholes discharge the drained water into the gallery, due to its extension in the presently stabilised landslide mass below the active zone. The modelling tools developed for La Frasse landslide thus provide all the necessary information to optimise the drainage scheme. |
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