Simulating dynamic processes and hypermobility mechanisms of the Wenjiagou rock avalanche triggered by the 2008 Wenchuan earthquake using discrete element modelling

Deng, Qing‐Hai; Gong, Linxian; Zhang, Liping; Yuan, Rui; Xue, Yong; Geng, Xuke; Shan-xiang, HU

doi:10.1007/s10064-016-0914-2

Cited by 32 publications

(11 citation statements)

References 40 publications

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“…Local damping applies a damping force, with a magnitude proportional to the unbalanced force, to each particle, while viscous damping adds normal and shear dashpots at each contact. Local damping is not applicable for landslide simulation (Deng et al, 2017). Therefore, viscous damping is used in the simulations.…”

Section: Model Parameters and Seismic Inputmentioning

confidence: 99%

“…The results of field restitution coefficient tests conducted by Giani (1992) are used to define the damping parameters. The values of the normal and shear damping coefficients are thus set to 0.4 and 0.2, respectively, (Deng et al, 2017).…”

Section: Model Parameters and Seismic Inputmentioning

confidence: 99%

“…Therefore, the particle-based DEM is more appropriate than DDA or the continuum methods for simulating the dynamic failure process and kinematic characteristics of landslides triggered by earthquakes. Huang et al (2012), Tang et al (2013), Zhou et al (2013), Yuan et al (2014), andDeng et al (2017) developed 2D DEM models to simulate the dynamic process of landslides triggered by earthquakes and explore their seismic failure mechanism. In their simulations, the sliding surface and bedrock were represented by wall elements, and the seismic ground motion histories were applied to the wall boundaries.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Process and Mechanism of the Catastrophic Taihongcun Landslide Triggered by the 2008 Wenchuan Earthquake Based on Field Investigations and Discrete Element Method Simulations

Zhou

Wei²,

et al. 2021

Front. Earth Sci.

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The Taihongcun landslide, which was a remarkable geological disaster triggered by the 2008 Wenchuan earthquake, had a volume of about 2 × 106 m3 and killed about 23 people. Through detailed field investigations, basic information of topography, geological structure and stratigraphy for the landslide were acquired and key kinetic characteristics of the landslide were identified. On the basis of filed investigations, 2D numerical models with discrete element method (DEM) were established to simulate the kinematics and failure process of the landslide. To ensure the validity of the dynamic calculations, the free-field boundary condition was developed and introduced intro the DEM models. According to filed investigations and DEM simulations, the dynamic processes of the Taihongcun landslide can be divided into four phases: fragmentation, projection motion, scraping, and granular debris flow and accumulation. In addition, the parameter analysis showed that the particle bond strength had a significant influence on the runout distance and landslide debris morphology. Finally, the possible mechanism of the Taihongcun landslide was determined: a rock mass of poor quality provided the lithological basis for this landslide formation; a joint set J1 in the back scarp and a weak interlayer of carbonaceous slate and shale between the upper sliding mass and the bedrock formed the rupture boundaries of the upper source area; a strong seismic ground motion was the external excitation that triggered the destructive landslide event; additionally, hypermobility was caused by the high elevation and topographical conditions of the landslide.

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Section: Model Parameters and Seismic Inputmentioning

confidence: 99%

Section: Model Parameters and Seismic Inputmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic Process and Mechanism of the Catastrophic Taihongcun Landslide Triggered by the 2008 Wenchuan Earthquake Based on Field Investigations and Discrete Element Method Simulations

Zhou

Wei²,

et al. 2021

Front. Earth Sci.

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“…The significant difference between earthquake and gravity-induced landslides was that earthquake-induced landslides generally presented steep scarp. e.g., the Daguangbao and Wenjiagou landslides triggered by the 2008 Wenchuan earthquake have steep scarps with a height difference of 700 m and 445 m, respectively (Deng et al, 2017;Cui et al, 2020). Generally, an arc-shaped shear failure was presented in slope deformation caused by gravity (Bouissou et al, 2012).…”

Section: Formation Of the Depression Beltmentioning

confidence: 99%

Sanxicun landslide: an investigation of progressive failure of a gentle bedding slope

et al. 2021

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A gentle bedding slope (16° dip angle) failure at Sanxicun (SXC) village in Dujiangyan city was triggered by heavy rainfall in 2013. The landslide (composing of sandstone and mudstone strata) has a sliding distance of up to 1200 m and caused 166 deaths. After this failure event, a detailed field survey and a series of laboratory tests were carried out by us to investigate the progressive failure mechanism of the slope. The results revealed that the slope deformation could be traced back to the Ming Dynasty in China (400 years before) at least. A sliding block with a width of 330 m and a length of 240 m detached its original position, resulting in a depression belt with 10 m in width and 25 m in depth at the rear of the sliding block. On the scarp, a large number of cracks were widely observed not only in the sandstone but also in the mudstone. The field evidence revealed that the depression belt and cracked mudstone had provided convenience for water infiltration for a long time. The shake table test results showed that these cracks could be initiated and propagated in the slope during earthquakes. Especially, seismic stresses amplifications were induced in the mudstone to degrade this layer obviously. Besides, Direct shear tests of cracked mudstone with different immersion time were carried out. It was showed 2 that the shear strength of mudstone decreased rapidly in the initial immersion and then tends to be stable gradually. Finally, numerical calculation indicated that the hydrostatic pressure in the depression belt and uplift pressure in the basal layer generated by the strongest rainwater in history (537.4 mm daily) caused the kilometer-slide of the block in 2013. We concluded that the catastrophic failure of the SXC landslide triggered by the rainwater in 2013 strongly depended on the pre-existing deformation and damage caused by historical earthquakes and rainwaters.

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“…La generación de flujos de material desagregado se puede estudiar por medio de experimentos físicos y su simulación con DEM en trabajos de análisis del proceso de flujo de detritos acoplado con fluidos [8]- [10], casos de estudio de eventos reales [11], [12], estudio numérico de la segregación el proceso de flujo de detritos en canales [13] o en particular con el modelo del tambor rotativo. En este último experimento, el material granular se recircula generando un proceso continuo y relativamente fácil de comparar con modelos de laboratorio.…”

Section: Introductionunclassified

Análisis numérico de la influencia de la granulometría para la generación de flujos secos de detritos mediante el DEM

Arévalo-Mendoza

Ramos-Cañón

Prada-Sarmiento

2017

TecnoL.

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El flujo de detritos es un proceso de naturaleza granular que ha sido abordado ampliamente bajo metodologías basadas en el medio continuo. Sin embargo, estas aproximaciones simplifican la realidad granular del suelo. Como material granular, la granulometría puede gobernar el comportamiento de este movimiento desagregado de masa. Es posible estudiar este comportamiento en términos del ángulo máximo alcanzado (θ), la energía cinética (Ek) y la profundidad de flujo (Fd) con el fin de establecer condiciones potenciales de falla, así como sus capacidades de daño. Para abordarlo se hace uso del método de elementos discretos, desarrollado por [1], bajo un estudio paramétrico en el cual se varían los parámetros de la granulometría: el tamaño medio del grano (d50), el coeficiente de curvatura (Cu) y el tamaño máximo de la muestra (dmax). Los resultados muestran que existe una influencia apreciable y una estrecha relación en los parámetros Ek y Fd. Con respecto al θ alcanzado en superficie se tiene una variación de menos de 5° para valores extremos de d50. Con esto, se muestra que la granulometría puede ser un factor importante que influye en la generación de flujos de detritos y se encuentran relacionadas cercanamente.

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Simulating dynamic processes and hypermobility mechanisms of the Wenjiagou rock avalanche triggered by the 2008 Wenchuan earthquake using discrete element modelling

Cited by 32 publications

References 40 publications

Dynamic Process and Mechanism of the Catastrophic Taihongcun Landslide Triggered by the 2008 Wenchuan Earthquake Based on Field Investigations and Discrete Element Method Simulations

Dynamic Process and Mechanism of the Catastrophic Taihongcun Landslide Triggered by the 2008 Wenchuan Earthquake Based on Field Investigations and Discrete Element Method Simulations

Sanxicun landslide: an investigation of progressive failure of a gentle bedding slope

Análisis numérico de la influencia de la granulometría para la generación de flujos secos de detritos mediante el DEM

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