Initiation of flow liquefaction in granular soil slopes: drained versus undrained conditions

Chen, Yanni; Yang, Jun

doi:10.1007/s11440-023-01958-6

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…Another possible failure mechanism for loose fill slopes under rainfall is the instability under the constant shear drained (CSD) stress path (Anderson and Sitar 1995;Cascini et al 2010;Dong et al 2016). Most recent attempts in this regard include that by Chen and Yang (2023) and Zhang et al (2023), who examined the correspondence between soil responses under the CSD stress path and the undrained triaxial compression path. While the CSD response can be reproduced in laboratory element tests and in element simulations for saturated soils, it remains uncertain whether it can occur in physical model tests (Take et al 2004) or in field conditions for which soils are largely unsaturated.…”

Section: Limitations and Future Studymentioning

confidence: 99%

New insights into the catastrophic slope failures at Sau Mau Ping: the role of antecedent rainfall pattern

Natalia,

Yang

2024

Landslides

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Climate change is increasing the frequency and intensity of extreme rainfall events, which aggravate the threat to the safety of natural and man-made slopes. There is growing interest in the role of rainfall characteristics in these slope failures. Most of previous studies treated the rainfall individually or as cumulative value and used hypothetical rainfall temporal patterns with no association with actual physical failures. In this study, the two deadly landslides in Sau Mau Ping, Hong Kong, in June 1972 and August 1976, which caused 165 casualties, are revisited. An intriguing question that has long been overlooked is posed: why the slopes that withstood the 1972 rainfall failed in the 1976 rainfall, given that the rainfall intensity of the latter event was only half of the former? Based on an extensive review of the forensic reports and relevant studies on the failure events, numerical modeling is carried out by a combination of seepage analysis with stability analysis and unsaturated shear strength theory. Focus is placed on the geological and hydrological settings and the rainfall characteristics, particularly the temporal pattern of the antecedent and main rainfall, to look into the causes and mechanisms for these failures. Implications of the new findings for future research and practice are also highlighted.

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