Creep properties of clastic soil in a reactivated slow-moving landslide in the Three Gorges Reservoir Region, China

Wang, Shun; Wang, Jinge; Wu, Wei; Cui, Deshan

doi:10.31224/osf.io/cdvse

Cited by 5 publications

(11 citation statements)

References 33 publications

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“…δ h and δ v values generally increased with the increasing values of shear stress τ . Prior to a failure, there were two phases observed in the development of δ h and δ v , namely rapid primary shear phase and stable secondary shear phase 9 , 26 . The development of δ h was significant and rapid in the very beginning of each shear load stage, referred also to as the rapid primary shear phase, followed by the development of δ h and δ v at a nearly constant shear rate, referred also to as the stable secondary shear phase.…”

Section: Resultsmentioning

confidence: 99%

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Effect of straw reinforcement on the shearing and creep behaviours of Quaternary loess

Xue

Cheng

Wang

2021

Sci Rep

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In addition to the shearing behavior of soil, the creep character is also considered crucial in determining the long-term shear strength. This especially holds true for the loess that possesses the metastable microstructure and is prone to landslide hazards. This study explored the potential application of straw reinforcement to enhance the shearing and creep properties of the Quaternary loess. The mechanism responsible for the straw reinforcement to elevate the peak shear strength was revealed. Furthermore, three creep characters, namely attenuating creep, non-attenuating creep, and viscous flow were identified in this study. The unreinforced and reinforced specimen behaved in a different manner under identical shear stress ratio condition. The reinforced specimen was superior in limiting the particle relative movement within the shear plane than the unreinforced specimen. The chain reaction of interparticle contact loss, accompanied with excessive viscous displacement, rapid weakening of creep resistance, and eventually accelerated creep displacement, provided an evidence for the formation mechanism of slow-moving landslide. The long-term shear strength using the isochronal stress–strain relationship may be used for optimising the design of high-fill embankment works.

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Section: Resultsmentioning

confidence: 99%

“…The Chinese Loess Plateau, located in northwest region of China, is the main distribution area of China’s loess and has been prone to landslides 1 – 9 . The loess tends to behave in an unstable manner when subjected to external disturbances due to its metastable structure, high porosity, and high water sensitivity 10 – 16 .…”

Section: Introductionmentioning

confidence: 99%

Effect of straw reinforcement on the shearing and creep behaviours of Quaternary loess

Xue

Cheng

Wang

2021

Sci Rep

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“…(a) Development of cracks in the tunnel group together with the variations in the TGR water level and rainfall, the legend, for example, C301 120 m denotes the first extensometer located at the position of 120 m in the third branch tunnel (S. Wang, Wang, et al, 2020). (b) Cumulative and weekly displacement rates of the cracks from 2013 to 2014 (S. Wang, Wu, Wang, et al, 2018).…”

Section: Forcings and Mechanisms Of Creep Movementmentioning

confidence: 99%

“…1 riverside sliding mass of the Huangtupo landslide and the locations of the crackmeters in the investigation tunnel. Modified after S. Wang, Wang, et al (2020).…”

Section: Background Of the Huangtupo Landslidementioning

confidence: 99%

Recent advances in the investigation of a slow‐moving landslide in the Three Gorges Reservoir area, China

Wang

2022

River

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Many slow-moving landslides in the Three Gorges Reservoir (TGR) area exhibit episodic movement patterns in response to variations in the reservoir water level and seasonal rainfall. These landslides are typically characterized by pre-existing shear zones composed of thick, clay-rich layers that are sensitive to hydrological forcings. The residual shear strength of these shear zones is believed to control the dynamic movements of these landslides. In this article, we review the recent advances in the investigation of a large slow-moving landslide, the Huangtupo landslide, in the TGR area. This landslide has been chosen as a benchmark for studying similar landslides in this area. This review focuses mainly on the research carried out by the authors and their collaborators over the last 5 years on topics including the landslide mechanisms and forcings, rheological behaviors and constitutive models of the landslide materials, the numerical simulation of clastic shear-zone soils, and the effects landslide-induced tsunamis would have on the ships in the reservoir. In addition, new perspectives and challenges for future research on slow-moving landslides are provided.

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“…This is for instance due to phenomena such as creep, which may degenerate into rapid strain acceleration precurring spontaneous failure 32–36 . Similarly, recent experimental studies have shown that delayed strain localization and accelerating deformations can emerge in ring shear creep tests 37–39 . In the domain of rock mechanics, experiments have shown the accumulation of non‐negligible creep under a wide range of confinement conditions, including those conductive of strain localization upon sustained shear.…”

Section: Introductionmentioning

confidence: 99%

Strain localization criteria for viscoplastic geomaterials

Deng

Shahin

Lü

et al. 2022

Num Anal Meth Geomechanics

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This work presents a viscoplastic localization criterion to detect quasi‐instantaneous (i.e., load‐induced) and delayed (creep‐induced) strain localization in rate‐dependent solids. The study is based on the theory of controllability and a viscoplastic description of the mechanical response. Analytical precursors of unstable states are defined through systems of ordinary differential equations (OEDs). The use of the proposed criteria is illustrated at the material point level through a set of strain localization analyses simulating active strain localization of a porous rock. In addition, full‐field finite element simulations of compression tests conducted under various pressures are reported to demonstrate the role of local unstable viscoplasticity in the spontaneous propagation of deformation bands under stationary boundary conditions. The study shows that the viscoplastic localization criterion maintains a negative sign as long as the behavior is unstable, that is, the rate of deformation is accelerating. The sign switch coincides with the transition to decelerating deformation. The analyses revealed that pulses of overstress always emerge in correspondence with the growth of unstable behavior, and the peak matches the transition to stable behavior. The local responses recovered from full‐field analyses were consistent with those observed in analyses at material point level and the predictions of the presented theory.

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Creep properties of clastic soil in a reactivated slow-moving landslide in the Three Gorges Reservoir Region, China

Cited by 5 publications

References 33 publications

Effect of straw reinforcement on the shearing and creep behaviours of Quaternary loess

Effect of straw reinforcement on the shearing and creep behaviours of Quaternary loess

Recent advances in the investigation of a slow‐moving landslide in the Three Gorges Reservoir area, China

Strain localization criteria for viscoplastic geomaterials

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