FN Archimer Export Format
PT J
TI Cone penetration testing to assess slope stability in the 1979 Nice landslide area (Ligurian Margin, SE France)
BT 
AF STEINER, Alois
   KOPF, Achim J.
   HENRY, Pierre
   STEGMANN, Sylvia
   APPRIOUAL, Ronan
   PELLEAU, Pascal
AS 1:1,2;2:1,2;3:3;4:1,2;5:4;6:4;
FF 1:;2:;3:;4:;5:PDG-REM-GM-CTDI;6:PDG-REM-GM-CTDI;
C1 Univ Bremen, Marine Geotech, MARUM Ctr Marine Environm Sci, D-28359 Bremen, Germany.
   Univ Bremen, Fac Geosci, D-28359 Bremen, Germany.
   CEREGE Univ Aix Marseille III, Coll France, Aix En Provence, France.
   IFREMER, Ctr Brest, Plouzane, France.
C2 UNIV BREMEN MARUM, GERMANY
   UNIV BREMEN, GERMANY
   UNIV AIX MARSEILLE, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-CTDI
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 2.503
TC 12
UR https://archimer.ifremer.fr/doc/00276/38679/37172.pdf
LA English
DT Article
DE ;Dynamic penetrometer;Sub-seafloor modeling;Weak zone;Free gas;Numerical slope stability
AB In the landslide-prone area near the Nice international airport, southeastern France, an interdisciplinary approach is applied to develop realistic lithological/geometrical profiles and geotechnical/strength sub-seafloor models. Such models are indispensable for slope stability assessments using limit equilibrium or finite element methods. Regression analyses, based on the undrained shear strength (su) of intact gassy sediments are used to generate a sub-seafloor strength model based on 37 short dynamic and eight long static piezocone penetration tests, and laboratory experiments on one Calypso piston and 10 gravity cores. Significant strength variations were detected when comparing measurements from the shelf and the shelf break, with a significant drop in su to 5.5 kPa being interpreted as a weak zone at a depth between 6.5 and 8.5 m below seafloor (mbsf). Here, a 10% reduction of the in situ total unit weight compared to the surrounding sediments is found to coincide with coarse-grained layers that turn into a weak zone and detachment plane for former and present-day gravitational, retrogressive slide events, as seen in 2D chirp profiles. The combination of high-resolution chirp profiles and comprehensive geotechnical information allows us to compute enhanced 2D finite element slope stability analysis with undrained sediment response compared to previous 2D numerical and 3D limit equilibrium assessments. Those models suggest that significant portions (detachment planes at 20 m or even 55 mbsf) of the Quaternary delta and slope apron deposits may be mobilized. Given that factors of safety are equal or less than 1 when further considering the effect of free gas, a high risk for a landslide event of considerable size off Nice international airport is identified
PY 2015
PD NOV
SO Marine Geology
SN 0025-3227
PU Elsevier Science Bv
VL 369
UT 000365065000013
BP 162
EP 181
DI 10.1016/j.margeo.2015.08.008
ID 38679
ER

EF