Pore-pressure generation and movement of rainfall-induced landslides: effects of grain size and fine-particle content

Wang, Gonghui; Sassa, Kyoji

doi:10.1016/s0013-7952(02)00268-5

Cited by 355 publications

(168 citation statements)

References 28 publications

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“…After the initiation of the movement, the clayey material probably played an important role to form a lubricating layer at the base of landslide material by keeping high pore pressure during movement. This phenomenon has been investigated in flume tests, which show that the pore pressure increases rapidly with increasing fine-grained content and movement velocity during shearing (Wang and Sassa, 2003). Evans et al (2007) attributed the long runout of the Leyte landslide, the Philippines, to the loading of undrained paddy field material in the path of the landslide.…”

Section: Landslide Dammentioning

confidence: 99%

Catastrophic landslide induced by Typhoon Morakot, Shiaolin, Taiwan

2011

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Typhoon Morakot induced the catastrophic and deadly Shiaolin landslide in southern Taiwan on 9 August 2009, resulting in more than 400 casualties. We undertook a geological and geomorphological investigation with the aim of reconstructing the events leading up to this landslide and to clarify factors that contributed to its development. Cumulative rainfall reached up to 1676.5 mm in about three days under the influence of the typhoon, and the Shiaolin landslide, with a volume of 25 x 10(6) m(3), occurred one day after the peak in rainfall intensity. The landslide occurred on a dip slope overlying late Miocene to early Pliocene sedimentary rocks consisting of silty shale, massive mudstone, and sandstone. It started as a rockslide in the upper third of the landslide area and transformed into a rock avalanche that crossed a series of terraces and displaced or buried the village below. It buried the riverbed of the Chishan River and ran up the opposite slope, creating a landslide dam 60 m high, which was breached about I h and 24 min later, flooding the village. The velocity of the landslide is estimated to have been 20.4 to 33.7 m s(-1) and its apparent friction angle was 14 degrees, which indicates its high mobility. The detachments in the source area consist of combinations of bedding planes and joints or faults. The landslide was preceded by gravitational deformation, which appeared as hummocky landforms before the landslide and as buckle folds exposed after the event. The landslide deposits consist of fragments of mudstone, shale, and sandstone, as well as clayey material at its base. This clayey material. consisting of Wire. chlorite, quartz, feldspar, and calcite, is assumed to have strongly influenced the long, rapid runout. (C) 2010 Elsevier B.V. All rights reserved

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Section: Landslide Dammentioning

confidence: 99%

Catastrophic landslide induced by Typhoon Morakot, Shiaolin, Taiwan

2011

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“…For instance, a direct shear test was performed on rock-soil mixtures with different porosities, and the shear strength was found to depend largely on the aggregation degree of the rocks and soil (Vallejo and Mawby 2000). The rainfallinduced SRM landslide was reproduced by utilizing the self-developed laboratory experimental apparatus, and the observed failure phenomena revealed that the landslide failure mode depended greatly on the grain size and fine particle content (Wang and Sassa 2003). The effect of gravel content on SRM shear properties was also investigated (Kuenza et al 2004;Xu et al 2008b;Ouyang et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the failure process of soil–rock mixtures through computed tomography and PFC3D models

Sun

Xing

et al. 2018

Int J Coal Sci Technol

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Soil-rock mixture (SRM) is a unique type of geomaterial characterized by a heterogeneous composition and a complicated structure. It is intractable for the continuum-based soil and rock mechanics theories to accurately characterize and predict the SRM's mechanical properties. This study reports a novel numerical method incorporating microfocus computed tomography and PFC3D codes to probe the deformation and failure processes of SRM. The three-dimensional (3D) PFC models that represent the SRM's complex structures were built. By simulating the entire failure process in PFC3D, the SRM's strength, elastic modulus and crack growth were obtained. The influence of rock ratios on the SRM's strength, deformation and failure processes, as well as its internal mesoscale mechanism, were analyzed. By comparing simulation results with experimental data, it was verified that the 3D PFC models were in good agreement with SRM's real structure and the SRM's compression process, deformation and failure patterns; its intrinsic mesomechanism can be effectively analyzed based on such 3D PFC models.

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“…The bedrock surface connects sparsely saturated regions [28], and thus determines, along with regolith thickness, the water pressure within the soil mantle's pores. Indeed, depth to bedrock is a key variable that controls subsurface flow [29], and triggers landslides during rainfall events [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

The role of uncertainty in bedrock depth and hydraulic properties on the stability of a variably-saturated slope

Gomes

Vrugt

Vargas

et al. 2017

Computers and Geotechnics

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a b s t r a c tWe investigate the uncertainty in bedrock depth and soil hydraulic parameters on the stability of a variably-saturated slope in Rio de Janeiro, Brazil. We couple Monte Carlo simulation of a threedimensional flow model with numerical limit analysis to calculate confidence intervals of the safety factor using a 22-day rainfall record. We evaluate the marginal and joint impact of bedrock depth and soil hydraulic uncertainty. The mean safety factor and its 95% confidence interval evolve rapidly in response to the storm events. Explicit recognition of uncertainty in the hydraulic properties and depth to bedrock increases significantly the probability of failure.

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Pore-pressure generation and movement of rainfall-induced landslides: effects of grain size and fine-particle content

Cited by 355 publications

References 28 publications

Catastrophic landslide induced by Typhoon Morakot, Shiaolin, Taiwan

Catastrophic landslide induced by Typhoon Morakot, Shiaolin, Taiwan

Numerical analysis of the failure process of soil–rock mixtures through computed tomography and PFC3D models

The role of uncertainty in bedrock depth and hydraulic properties on the stability of a variably-saturated slope

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