Numerical study of granular debris flow run-up against slit dams by discrete element method

Zhou, Guomei; Du, Junhan; Song, Dongri; Choi, Clarence Edward; Hu, H. S.; Jiang, Chenghua

doi:10.1007/s10346-019-01287-4

Cited by 65 publications

(17 citation statements)

References 38 publications

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“…Based on the above analyses, the impact mode, either pile‐up or runup, can be tentatively identified for the overall impact process. Note that the impact behavior of a geophysical flow could start with a runup mode and transform into a pile‐up mode (Kong, Li, & Zhao, 2021; Song et al., 2017; Zhou, Du, et al., 2020). In this study, we recognize the primary impact mode according to flow features (e.g., dead zone shape and formation, flowing layer behavior) at stage II and the beginning of stage III when incoming flows remain adequate.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with slit and rigid countermeasures (Zhou, Du, et al., 2020; Iverson et al., 2016), flexible barriers are economical and easy to install and replace in mountainous regions. Consequently, they are increasingly used to protect critical infrastructures and residential areas from debris flows, snow avalanches, and rock avalanches (Bugnion et al., 2012; Wendeler, 2016).…”

Section: Introductionmentioning

confidence: 99%

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How Flexible, Slit and Rigid Barriers Mitigate Two‐Phase Geophysical Mass Flows: A Numerical Appraisal

Kong

Guan

et al. 2022

JGR Earth Surface

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The ever-growing climate change, extreme weather events, and continuous expansion of human populations into mountainous regions have contributed to the increase in the frequency, intensity, and duration of catastrophic geophysical mass flows (Fowler et al., 2021;Guerreiro et al., 2018;Hirschberg et al., 2021), such as debris flows, lahars and avalanches. In practical combats of these flows, flexible, slit, and rigid barriers (see Figure S1 in Supporting Information S1) are designed to reduce their peak discharge, flow velocity, erosion, and run-out distance (Gong et al., 2021;Iverson et al., 2016;Marchi et al., 2019). Nonetheless, current practice on the selection of barrier types and associated design has been largely empirical, since there is no unified analytical tool available for systematic analysis and comparison of their performance in arresting impinging flows of variable nature. This is due to the difficulties posed by the modeling of multi-body and multi-phase interactions. For

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

How Flexible, Slit and Rigid Barriers Mitigate Two‐Phase Geophysical Mass Flows: A Numerical Appraisal

Kong

Guan

et al. 2022

JGR Earth Surface

View full text Add to dashboard Cite

show abstract

“…Various constitutive models for geomaterials have been developed, either within the framework of continuum mechanics and critical state (CS) soil mechanics 46,47 or with consideration of micromechanical characteristics of the granular medium via micromechanical analysis 48 or discrete element method [49][50][51] (DEM). Typically, elastoplasticity models based on continuum mechanics are phenomenological without considering the internal interaction of particles.…”

Section: Introductionmentioning

confidence: 99%

Experimental and modelling investigation of vibration‐induced fluidization in sheared granular soils

Xie

Guo

Stolle

2023

Num Anal Meth Geomechanics

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Vibration-induced fluidization (ViF) is a phenomenon where a granular medium completely loses shear resistance or flows continuously under vibration and thus behaves like a fluid without invoking remarkable excess pore pressure. This paper attempts to investigate ViF through a series of modified triaxial tests and using an extended shear-transformation-zone (STZ) model that correlates macroscopic plastic deformation to the motion of internal mesoscopic weak spots (i.e., STZs) within granular materials. The test results revealed that the ViF may take place when the vibration is applied at either critical or non-critical states. Theoretical analyses using the extended STZ model show that the vibration intensity required to cause fluidization increases linearly with the initial quasi-static shear stress level at which vibration is imposed. The model results are generally consistent with experimental data, indicating that the extended STZ model has a desirable performance in simulating the fluidization of granular soil subjected to quasi-static shearing and vibration simultaneously.

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“…Blocked by the protective structure, the deposition behind the retaining wall will form a dead zone [24], in which the mass no longer moves. Then, the mass in this zone changes the geomorphological conditions of the subsequent mass, which will make the subsequent mass run-up in the vertical direction [25]. Run-up is one of the important reasons for the peak impact force [18,26].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Impact Characteristics of Rigid Retaining Wall for Blocking Landslides: A Case Study of the Shum Wan Road Landslide

et al. 2022

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Landslides pose a serious threat to the downstream infrastructure and personnel safety. For situations where the location of possible landslides is difficult to determine, or the potential landslides areas are widely distributed and scattered, passive protective structural measures need to be adopted to relieve the threat of landslides. Taking the Shum Wan Road landslide as an example, the discrete element method was used to reproduce and analyze the landslide movement. On this basis, this study conducts a further numerical investigation on the impact characteristics of the rigid retaining wall used to block landslides. The results show that the numerical back analysis can well represent the evolution of the landslide, and the numerical results are in good agreement with the actual situation, thus confirming its correctness and effectiveness. Under the condition of setting a rigid retaining wall, the landslide can be effectively blocked and form a final deposition behind the retaining wall. The impact on the rigid retaining wall varies with time, and the distribution of the impact in space is also uneven. Through the statistical analysis of the contact forces on the retaining wall, the distributions of static and peak stresses on the retaining wall can be obtained. Compared with the static stability, the spatial distribution of dynamic impact is more difficult to predict, especially the area of the peak impact has a significant influence on the design. Numerical investigation can efficiently and reliably provide abundant information of static stress and dynamic impact on the rigid retaining wall, which can provide important reference for the optimal design of the rigid retaining wall structure.

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Numerical study of granular debris flow run-up against slit dams by discrete element method

Cited by 65 publications

References 38 publications

How Flexible, Slit and Rigid Barriers Mitigate Two‐Phase Geophysical Mass Flows: A Numerical Appraisal

How Flexible, Slit and Rigid Barriers Mitigate Two‐Phase Geophysical Mass Flows: A Numerical Appraisal

Experimental and modelling investigation of vibration‐induced fluidization in sheared granular soils

Numerical Investigation of Impact Characteristics of Rigid Retaining Wall for Blocking Landslides: A Case Study of the Shum Wan Road Landslide

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