Dynamic modelling of retrogressive landslides with emphasis on the role of clay sensitivity

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Dynamic modelling of retrogressive landslides with emphasis on the role of clay sensitivity

X. Zhang, S. Sloan, E. Oñate

Abstract

This paper presents a detailed numerical study of the retrogressive failure of

landslides in sensitive clays. The dynamic modelling of the landslides is carried

out using a novel continuum approach, the particle finite element method,

complemented with an elastoviscoplastic constitutive model. The multiwedge

failure mode in the collapse is captured successfully, and the multiple retrogressive

failures that have been widely observed in landslides in sensitive clays

are reproduced with the failure mechanism, the kinematics, and the deposition

being discussed in detail. Special attention has been paid to the role of the clay

sensitivity on each retrogressive failure as well as on the final retrogression distance

and the final run‐ out distance via parametric studies. Moreover, the

effects of the viscosity of sensitive clays on the failure are also investigated

for different clay sensitivities.

Keywords:

landslides
FEM
Retrogressive Failure
Sensitive Clay
strain softening

How to cite

X. Zhang, S. Sloan and E. Oñate, Dynamic modelling of retrogressive landslides with emphasis on the role of clay sensitivity, Int. Journal for Numerical and Analytical Methods in Geomechanics (2018). Vol. 42, pp. 1806-1822 (preprint) URL https://www.scipedia.com/public/Zhang_et_al_2018a

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