Translational Inertial Effects and Scaling Considerations for Coarse Granular Flows Impacting Landslide-Resisting Barriers

Goodwin, George Robert; Choi, Clarence Edward

doi:10.1061/(asce)gt.1943-5606.0002661

Cited by 25 publications

(12 citation statements)

References 85 publications

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“…Estimating the design impact forces exerted by debris flows on obstacles and barriers is an increasingly important engineering challenge (Goodwin and Choi 2021, Ng et al 2021a, Sun and Law 2015. To model debris flow impact on rigid barriers, piezoresistive load cells are fixed to force plates and a reaction frame to measure impact forces (Liu 2019).…”

Section: Impact Forcementioning

confidence: 99%

“…Furthermore, the force plate should not be in contact with the channel, as this would create additional frictional resistance. Goodwin and Choi (2021) reported scaling considerations for the design of rigid load-measuring systems, which include the relative mass of the grains and the load-measuring system, the stiffness of the load-measuring system, and the grain impact velocity. In the design of flexible barriers, cable forces are usually measured by using load cells to estimate the total impact forces.…”

Section: Impact Forcementioning

confidence: 99%

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Flume Modeling of Debris Flows

Choi,

Ng,

Liu

2024

Geoenvironmental Disaster Reduction

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Debris flows are complex mixtures of water and soil, which range from clay to boulder size, that surge downslope under the influence of gravity. Debris flows are unique compared to other types of landslides (e.g., rock avalanches; dry granular flows) because their dynamics are governed by both the soil grains and interstitial fluid. On one hand, debris flows may exhibit some features of dry granular flows, such as particle size segregation. On the other hand, contact and collisional grain stresses are strongly influenced by the viscosity and excess pressure of the interstitial fluid. Furthermore, debris flows travel over complex erodible boundaries and have been reported to reach volumes of up to 10 9 m 3 and travel kilometers in length. Evidently, the scale and dynamics of natural debris flows are complex and difficult to reproduce. One of the most common approaches to investigate the dynamics of debris flows is by conducting experiments, which provide idealized and high-quality evidence to evaluate theoretical and numerical models. This chapter provides an overview of the fundamental principles, scaling considerations, commonly adopted setups (e.g., flumes and geotechnical centrifuge), and the state-of-the-art in instrumentation and image analysis for modeling debris flows.

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Section: Impact Forcementioning

confidence: 99%

Section: Impact Forcementioning

confidence: 99%

Flume Modeling of Debris Flows

Choi,

Ng,

Liu

2024

Geoenvironmental Disaster Reduction

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“…6b). The drop height and grain weight were selected to utilize the linear regions of the force sensors (Goodwin et al 2021).…”

Section: Instrumentationmentioning

confidence: 99%

“…7) where θ＇is the flume inclination (°) andф is the solid Hydrodynamic approach volume fraction. (Goodwin et al 2021) The results from empirical formulas were validated by comparing the measured impact forces of dry granular flows impacting rigid barriers. The impact force of 30 kg ellipsoidal samples falling from different heights on rigid barriers of different thicknesses at an incident angle of 90° was selected as an example.…”

Section:   =mentioning

confidence: 99%

Experimental investigation of maximum impact force exerted by dry granular flows on a rigid barrier

Yuan,

Wen,

Pei

2023

Preprint

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Rigid barriers are protective structures widely used in mountainous regions to resist the destructive impacts of dry granular flows originating from shallow landslides or collapses. The determination of the maximum impact force exerted by dry granular flows is crucial in designing rigid barriers. In this study, we conducted laboratory tests in which we examined the weight and particle shape of dry granular flows, as well as the drop height, incident angle, and thickness of the rigid barrier, to investigate the impact force on the rigid barrier. The results indicated that the strongest impact was concentrated at the centre of the rigid barrier, particularly in the lower centre area of the barrier. A new approach is proposed to estimate the maximum impact force on rigid barriers exerted by dry granular flows. In addition, a new impact equation for calculating the maximum impact force that explicitly considers the effects of rigid barrier structural properties on the impact dynamics based on the modulus, Poisson's ratio, and thickness and the particle shape effects based on different shape coefficients is proposed. Based on this new approach, agreement between the prediction results and the observation results was obtained.

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“…The profound consequences of such calamities, encompassing significant human casualties and substantial financial losses, have prompted the engineering community to comprehensively examine the design considerations and the intricacies of impact dynamics associated with landslide countermeasures. Various installations and safety structures, such as rigid barriers, gabion walls, flexible barriers, slit dams etc., have been deployed along the anticipated flow path to mitigate the destructive forces of granular mass flows across various parts of the world [1,2,3,4,5]. However, there still exists some lack of understanding of the fundamental physics of landslides involving granular mass flows.…”

Section: Introductionmentioning

confidence: 99%

Particle Morphological Effects on the Behaviour of Dry Granular Flow Against Rigid Obstacles

Dhanai,

Bhattacharya

2023

VIII International Conference on Particle-Based Methods

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Geohazards such as rockfall, catastrophic landslides, and debris flow pose a significant risk due to the rapid movement of the vast amount of granular material carrying tremendous destructive potential and energy. Experimental and numerical studies on channelized flumes have been prevalent in analyzing the kinematics and dynamics of the flow and their interaction with various mitigation measures along the projected flow path. Continuum, discontinuum, and hybrid numerical methods have been successfully employed in the past to comprehend the complex material behaviour of granular mass flows. Although the numerical schemes within a continuum setting offer some insights into critical factors like flow velocity, flow depth, runout distance, etc., the granular interaction within the particle ensemble and the impact force on the barrier system for a better estimate of the force-transmission paths cannot be accounted for. The present study employs the Discrete Element Method to investigate the underlying physics of the micromechanical interaction of the granular assembly with the rigid barrier. Although past studies have explored granular flow-like events within a discrete setting, such studies did not incorporate particle morphology. This paper explores the effect of particle shape on kinematics and impact dynamics against a rigid obstacle. First, the numerical results have been benchmarked against the experimental studies for conventional spherical particles, and then we explore the effect of particle morphology. The present findings indicate that the particle shape significantly influences the flow kinematics and leads to a reduction in impact force on the barrier due to the higher angularity of particles with different morphological features than spherical particles, generally considered in the existing literature. A more significant implication of this study is to better understand and design mitigation measures against geohazards.

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Translational Inertial Effects and Scaling Considerations for Coarse Granular Flows Impacting Landslide-Resisting Barriers

Cited by 25 publications

References 85 publications

Flume Modeling of Debris Flows

Flume Modeling of Debris Flows

Experimental investigation of maximum impact force exerted by dry granular flows on a rigid barrier

Particle Morphological Effects on the Behaviour of Dry Granular Flow Against Rigid Obstacles

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