Structural study of the Ballandaz landslide (French Alps) using geophysical imagery

摘要: This study of the Ballandaz landslide (Savoie, French Alps) was carried out as part ANR/PGCU-SIGMA research project. Its aim to characterize slope by different methods geophysical imagery, and then use this characterization provide a combined interpretation morpho-structures in order simulate geomechanical behavior sliding mass. First, electromagnetic mapping used identify variations surface lithology moisture from which one can more precisely locate active zone slope. Then, electrical seismic 2D imagery were along several transverse longitudinal profiles produce resistivity seismic-velocity depth sections showing up slope's structures. The H/V method also tested locally determine basement so complement profiles: it reveals potential site effects deeper Helped drilling inclinometer surveys, interpretations have revealed various units structuring landslide: (i) active, very heterogeneous shallow level overlying (ii) rigid, less porous, probably stable bedrock, (iii) boulders, (iv) sound geological quartzite gypsiferous facies. has shown usefulness combining such sounding techniques for studying complex environments like landslides; limitations each when environments.