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SOME FACTORS AFFECTING RETROGRESSIVE FAILURE OF SENSITIVE CLAY SLOPES USING LARGE DEFORMATION FINITE ELEMENT MODELING
Session: Landslides and Slope Stability IV / Mouvements de terrain et stabilité des pentes IV
Chen Wang, Memorial University of Newfounland (Canada)
Biswajit Saha, Memorial University of Newfoundland (Canada)
Bipul Hawlader, Memorial University of Newfoundland (Canada)
Many landslides in sensitive clay slopes near the riverbank in Eastern Canada and Scandinavia have been reported in the literature. Some of them extended over a large horizontal distance from the river bank. Traditional limit equilibrium methods cannot explain such failure because the failure surfaces develop progressively. Finite element (FE) modeling of such failure is also very challenging because significant strain localization occurs along the failure plane (shear band) that results in unacceptable mesh distortion. Moreover, the failed soil mass might displace a very large distance. The process of failure of sensitive clay slopes due to toe erosion is simulated using a large deformation FE modeling technique. Post-peak degradation of undrained shear strength and its effects on progressive failure surface development are examined. The effects of some factors, such as the amount of toe erosion, initial stress conditions (K0) and height of the slope, are examined. It is shown that these factors could change the failure patterns of sensitive clay slopes near the river bank.
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