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Abstract
Newmark displacement analysis (NDA) has been widely used to study the initiation and kinematics of earthquakeinduced landslides. The classical NDA for earthquakeinduced wedge slides assumes that the wedge is a rigid block (assumption A1). The vertical and horizontal accelerations perpendicular to the sliding direction are neglected (assumptions A2 and A3). Moreover, the friction angles (friction coefficients) of the sliding surfaces are assumed to be constant during sliding (assumption A4). This study evaluates the influences of these four assumptions on the kinematics of huge wedges adopted, where the shear stress could not be identical to the sliding direction. Different rock wedge shapes subjected to synthetic seismic loads are modeled, and the sensitivity of removing unnecessary assumptions from the analysis is evaluated. A case study of the earthquakeinduced Daguangbao landslide (wedge slide) is provided to assess the influence of the rigid wedge assumption and adopted strengths along wedge planes on the sliding kinematics. Our study shows that the rigid wedge method (RWM) incorporated into NDA (A1) always yields an unconservative prediction of permanent displacement comparing to maximum shear stress method (MSSM), particularly for huge, narrow wedges. The MSSM, which assumes that the shear stress perpendicular to the sliding direction equals the shear strength, should be considered owing to wedge deformation if huge rock masses are involved. Neglecting the vertical acceleration (A2) induced an underestimation of permanent displacement, particularly for narrow wedges with a gentle plunge of the intersection line. Although horizontal acceleration perpendicular to the trend of ILine does influence the NDA results for asymmetrical wedges, the effect (A3) is insignificant. Assuming a constant strength on the wedge plane (A4) only predicted stickslip behavior but not a frequently observed highmobility phenomenon of huge landslides. Finally, the rapid and long runout sliding of the Daguangbao landslide can be successfully predicted if the velocitydisplacement dependent friction law is appropriately incorporated into NDA using MSSM.
Original language  English 

Article number  107374 
Journal  Engineering Geology 
Volume  328 
DOIs  
State  Published  Jan 2024 
Keywords
 Earthquakeinduced wedge sliding
 Newmark displacement analysis
 Rigid and deformable wedge
 Velocitydisplacement dependent friction law
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Dive into the research topics of 'Revisit the classical Newmark displacement analysis for earthquakeinduced wedge sliding of a rock slope'. Together they form a unique fingerprint.Projects
 4 Finished


Geological Uncertainty and Societal Risk: the Perspectives of Engineering, Environment, and Geohazards( I )(2/2)
Juang, C.H. (PI)
1/08/20 → 31/07/22
Project: Research

Hydraulic and Mechanical Apertures  HydroMechanical Behaviour of Rock Joint under Low to High Confining Pressure(3/3)
Dong, J.J. (PI)
1/08/20 → 31/07/22
Project: Research