Study of large-scale deformation induced by gravity on the La Clapière landslide (Saint-Etienne de Tinée, France) using numerical and geophysical approaches
Identifieur interne : 000922 ( Main/Exploration ); précédent : 000921; suivant : 000923Study of large-scale deformation induced by gravity on the La Clapière landslide (Saint-Etienne de Tinée, France) using numerical and geophysical approaches
Auteurs : E. Tric [France] ; T. Lebourg [France] ; H. Jomard [France] ; J. Le Cossec [France]Source :
- Journal of Applied Geophysics [ 0926-9851 ] ; 2010-01-18.
Abstract
The large-scale deformation of high mountain slopes finds its origin in many phenomena with very different time-constants. Gravitational effect, tectonic forces, and water infiltration are generally the principal causes. However, it is always very difficult to distinguish which cause is dominant and which are their respective effects. A two-dimensional numerical experiment coupled with geophysical approach were carried out to determine (1) the effect of gravitational force on the mechanical behaviour of the” la Clapière” area, (2) a 2D-depth structure of this landslide. The results show that gravitational instability is possible and leads to destabilisation of the massif by a regressive evolution of the landslide from the bottom at 1100 m up to a height of 1800 m, which is actually the top of the La Clapière landslide. This deformation progression only concerns a depth of around 150 ± 50 m, which can be correlated to the sliding surface, as suggested by our electrical data obtained by resistivity investigations and previous studies. Our numerical results suggest that changes of the slope topography “drive” the diffusion of the plastic deformation in the mass, possibly through a channel which could be then the privileged zone along which the fracture is initiated.
Url:
DOI: 10.1016/j.jappgeo.2009.12.008
Affiliations:
- France
- Haute-Normandie, Provence-Alpes-Côte d'Azur, Région Normandie
- Le Havre, Nice
- Université Nice Sophia Antipolis, Université du Havre
Links toward previous steps (curation, corpus...)
- to stream Hal, to step Corpus: 000315
- to stream Hal, to step Curation: 000315
- to stream Hal, to step Checkpoint: 000450
- to stream Main, to step Merge: 000929
- to stream Main, to step Curation: 000922
Le document en format XML
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Le Cossec</name><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-106846" status="INCOMING"><orgName>Laboratoire Ondes et Milieux Complexes</orgName><orgName type="acronym">LOMC</orgName><desc><address><addrLine>53, rue de Prony BP 540, 76058 Le Havre Cedex</addrLine><country key="FR"></country></address></desc><listRelation><relation active="#struct-300317" type="direct"></relation></listRelation><tutelles><tutelle active="#struct-300317" type="direct"><org type="institution" xml:id="struct-300317" status="VALID"><orgName>Université du Havre</orgName><desc><address><country key="FR"></country></address></desc></org></tutelle></tutelles></hal:affiliation><country>France</country><placeName><settlement type="city">Le Havre</settlement><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region></placeName><orgName type="university">Université du Havre</orgName></affiliation></author></analytic><idno type="DOI">10.1016/j.jappgeo.2009.12.008</idno><series><title level="j">Journal of Applied Geophysics</title><idno type="ISSN">0926-9851</idno><imprint><date type="datePub">2010-01-18</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The large-scale deformation of high mountain slopes finds its origin in many phenomena with very different time-constants. Gravitational effect, tectonic forces, and water infiltration are generally the principal causes. However, it is always very difficult to distinguish which cause is dominant and which are their respective effects. A two-dimensional numerical experiment coupled with geophysical approach were carried out to determine (1) the effect of gravitational force on the mechanical behaviour of the” la Clapière” area, (2) a 2D-depth structure of this landslide. The results show that gravitational instability is possible and leads to destabilisation of the massif by a regressive evolution of the landslide from the bottom at 1100 m up to a height of 1800 m, which is actually the top of the La Clapière landslide. This deformation progression only concerns a depth of around 150 ± 50 m, which can be correlated to the sliding surface, as suggested by our electrical data obtained by resistivity investigations and previous studies. Our numerical results suggest that changes of the slope topography “drive” the diffusion of the plastic deformation in the mass, possibly through a channel which could be then the privileged zone along which the fracture is initiated.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Haute-Normandie</li><li>Provence-Alpes-Côte d'Azur</li><li>Région Normandie</li></region><settlement><li>Le Havre</li><li>Nice</li></settlement><orgName><li>Université Nice Sophia Antipolis</li><li>Université du Havre</li></orgName></list><tree><country name="France"><region name="Provence-Alpes-Côte d'Azur"><name sortKey="Tric, E" sort="Tric, E" uniqKey="Tric E" first="E." last="Tric">E. Tric</name></region><name sortKey="Jomard, H" sort="Jomard, H" uniqKey="Jomard H" first="H." last="Jomard">H. Jomard</name><name sortKey="Le Cossec, J" sort="Le Cossec, J" uniqKey="Le Cossec J" first="J." last="Le Cossec">J. Le Cossec</name><name sortKey="Lebourg, T" sort="Lebourg, T" uniqKey="Lebourg T" first="T." last="Lebourg">T. Lebourg</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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