Regression analysis for seismic slope instability based on a double phase viscoplastic sliding model of the rigid block

Semi-empirical models based on Newmark’s sliding block permit the estimation of expected co-seismic displacements in relation to one or more parameters which characterize the ground motion that theoretically caused them. Taking this into consideration, a regression analysis, based on a double-phase viscoplastic (DPV) model, was developed using 96 Italian ground motion accelerograms for a total of 1,448 combinations obtained for different parametric conditions of the indefinite slope model. Repeated stability analysis, performed by means of the DPV model, allows for the assessment of the seismic instability of a slope in relation to different reached behaviour levels, as well as seismically induced permanent displacements. At these behaviour levels, co-seismic increases and possible subsequent decreases of viscoplastic shear strengths are associated. This implies that the post-seismic persistent mobility (collapse) of the slope can be obtained from the computation. On the other hand, coherently with the increasing of shear resistances during fast sliding displacements in clay soils, the seismic-forced displacements result substantially lower than corresponding values obtained by means of the rigorous Newmark’s sliding block. In addition, in relation to some seismic ground motion parameters, regression and functional border and separation curves were obtained with the aim of providing an expeditious seismic slope stability evaluation in reference to the co-seismic and post-seismic behaviour of clayey slopes. Regarding this, the real behaviour of two historical landslide events is discussed in the light of the results of the regression analysis outlined in this work.

[1]  R. Araya,et al.  Earthquake accelerogram destructiviness potential factor , 1982 .

[2]  Richard J. Bathurst,et al.  Deterministic sliding block methods for estimating seismic displacements of earth structures , 1996 .

[3]  J. Douglas,et al.  Internet site for European strong-motion data , 2004 .

[4]  P. Revellino,et al.  Structurally controlled earth flows of the Benevento province (Southern Italy) , 2010 .

[5]  S. Martino,et al.  Evidences of landslide earthquake triggering due to self-excitation process , 2011 .

[6]  Ellen M. Rathje,et al.  A unified model for predicting earthquake-induced sliding displacements of rigid and flexible slopes , 2011 .

[7]  K Keefer David,et al.  Predicting earthquake-induced landslides, with emphasis on arid and semi-arid environments , 1989 .

[8]  E Kavazanjian,et al.  NEWMARK DEFORMATION ANALYSIS WITH DEGRADING YIELD ACCELERATION , 1997 .

[9]  P. Carrubba,et al.  Monotonic fast residual strength of clay soils. , 2006 .

[10]  Wai-Fah Chen,et al.  Seismic Displacements in Slopes by Limit Analysis , 1984 .

[11]  Robert J. Hansen,et al.  Seismic design for nuclear power plants , 1970 .

[12]  Teamrat A. Ghezzehei,et al.  Rheological properties of wet soils and clays under steady and oscillatory stresses , 2000 .

[13]  Jonathan D. Bray,et al.  INCLINED PLANE STUDIES OF THE NEWMARK SLIDING BLOCK PROCEDURE , 2003 .

[14]  S. Martino,et al.  The role of the seismic trigger in the Calitri landslide (Italy): historical reconstruction and dynamic analysis , 2005 .

[15]  A. Arias.  A measure of earthquake intensity , 1970 .

[16]  Randall W. Jibson,et al.  PREDICTING EARTHQUAKE-INDUCED LANDSLIDE DISPLACEMENTS USING NEWMARK'S SLIDING BLOCK ANALYSIS , 1993 .

[17]  Antonio Iodice,et al.  Assessing the activity of a large landslide in southern Italy by ground-monitoring and SAR interferometric techniques , 2012 .

[18]  N. N. Ambraseys,et al.  Earthquake‐induced ground displacements , 1988 .

[19]  Paolo Bazzurro,et al.  The 2002 Molise, Italy, Earthquake , 2004 .

[20]  Randall W. Jibson,et al.  Analysis of the seismic origin of landslides: Examples from the New Madrid seismic zone , 1993 .

[21]  L. Bjerrum.  PROGRESSIVE FAILURE IN SLOPES OF OVERCONSOLIDATED PLASTIC CLAY AND CLAY SHALES , 1967 .

[22]  Gerardo Grelle,et al.  Bedding control on landslides: a methodological approach for computer-aided mapping analysis , 2011 .

[23]  Alec Westley Skempton,et al.  Residual strength of clays in landslides, folded strata and the laboratory , 1985 .

[24]  R. Romeo,et al.  The Large Salcito Landslide Triggered by the 2002 Molise, Italy, Earthquake , 2004 .

[25]  A. Skempton.  Long-Term Stability of Clay Slopes , 1964 .

[26]  S. K. Sarma.  Seismic stability of earth dams and embankments , 1975 .

[27]  P. Revellino,et al.  Methodology for seismic and post-seismic stability assessment of natural clay slopes based on a viscoplastic behaviour model in simplified dynamic analysis , 2011 .

[28]  J. Facciorusso,et al.  Influence of uncorrected accelerogram processing techniques on Newmark's rigid block displacement evaluation , 2003 .

[29]  R. Jibson.  Regression models for estimating coseismic landslide displacement , 2007 .

[30]  P. R. Vaughan,et al.  FAST SHEARING OF PRE-EXISTING SHEAR ZONES IN SOIL , 1996 .

[31]  Robert V. Whitman,et al.  Seismic Design of Gravity Retaining Walls , 1985 .

[32]  Edwin L. Harp,et al.  Map showing slope stability during earthquakes in San Mateo County, California , 1985 .

[33]  Gerardo Grelle,et al.  Shear mechanisms and viscoplastic effects during impulsive shearing , 2010 .

[34]  Michele Maugeri,et al.  Analisi di stabilità di un pendio in condizioni sismiche e post-sismiche , 1996 .

[35]  N. Newmark.  Effects of Earthquakes on Dams and Embankments , 1965 .

[36]  G. Mesri,et al.  Residual shear strength mobilized in first-time slope failures , 2003 .

[37]  A. G. Brady,et al.  A STUDY ON THE DURATION OF STRONG EARTHQUAKE GROUND MOTION , 1975 .

[38]  T. Crespellani,et al.  Earthquake destructiveness potential factor and slope stability , 1998 .