SPH-FDM propagation and pore water pressure modelling for debris flows in flume tests

Cascini, Leonardo; Cuomo, Sabatino; Pastor, Manuel; Rendina, Ilaria

doi:10.1016/j.enggeo.2016.08.007

Cited by 48 publications

(23 citation statements)

References 22 publications

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“…In recent years, SPH has also been utilized in geomechanics problems such as soil-structure interaction [2]; [51]; [1,4], slope stability [5], and foundation design [45]. For modeling granular flow, elasto-plastic constitutive models have been implemented into the SPH framework to capture the general behavior of granular collapse [2,8,11,38,40,48], granular flow on inclined flume tests [6,44], and landslides [7,21,39]; however, most of these studies have not considered the effect of basal friction. For instance, Huang et al [21] simulated the impact force of dry granular material on an inclined flume and achieved good results; however, the friction between the granular material and the flume base was not considered and, instead, a back-calculated viscous Bingham fluid coefficient was used.…”

Section: Introductionmentioning

confidence: 99%

Comparison of SPH boundary approaches in simulating frictional soil–structure interaction

2020

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Two boundary algorithms in the framework of 3D smoothed particle hydrodynamics (SPH) method are proposed. The algorithms are capable of accounting for the friction and energy dissipation at elastic-plastic contacts between SPH particles and a solid boundary. Utilizing the proposed boundary algorithms, the accuracy of different methods to calculate the interaction force between SPH particles and a boundary surface is investigated. The effect of SPH artificial viscosity on the oscillation and accuracy of the calculated interaction force is also examined. It is found that using high artificial viscosities may unphysically damp out energy of the system and the use of dynamic artificial viscosity, which varies with time and space, may remediate this problem. Employing the proposed frictional boundary algorithms, the effect of basal friction on the collapse of granular columns is investigated. It is shown that the flow of a collapsing granular column can be divided into three flow regimes: a conical-shaped stationary regime, a collapsing regime, and a spreading regime. It is found that the existence and the interaction of these regimes are affected by basal friction. Additionally, the effect of basal friction on the final runout distance and deposit height is investigated.

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Section: Introductionmentioning

confidence: 99%

Comparison of SPH boundary approaches in simulating frictional soil–structure interaction

2020

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“…As a result, the pore-water pressure will dissipate from the shearing zone and the rest of the debris-flow mass. In return, the soil particles regain their contact friction and thereby increase shearing resistance of the moving debris [42,45,51]. A schematic representation of a debris-flow screen is illustrated in Figure 2.…”

Section: Debris-flow Screenmentioning

confidence: 99%

“…The potential, working mechanism, and design principles of structural countermeasures such as barriers, baffle and deflection walls have been extensively studied and reported in the literature, i.e. open and closed check dams or generally rigid and flexible barriers [24,25,28,29,[31][32][33][34][35][36][37][38], baffle walls [26][27][28]39,40], deflection and channel-side walls [9,22,41], and debris-flow screens [42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Laboratory investigation of performance of a screen type debris-flow countermeasure

et al. 2018

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Debris-flows are forms of landslides in mountainous regions that can potentially cause significant damage. Structural countermeasures to mitigate an entire debrisflow may become unrealistically large and expensive. If the flow cannot be stopped completely, one may alternatively consider reducing the impact and velocity of the flow using energy dissipating structures. A debris-flow screen is such countermeasure designed to dissipate energy. A screen is made by parallel grids, with some gap, placed in the direction of the debris-flow on an elevated foundation. This structure acts as a filter for separating water from the saturated debris-flow to reduce its flow energy. This work presents a laboratory model test investigating the effect of screen length (0.5 m and 1.0 m) and opening width (2 mm, 4 mm and 6 mm) in dissipating the debris-flow energy. The effectiveness of the screens was determined in terms of reductions in the run-out distance and flow velocity. The importance of the screen length and opening width is demonstrated. A hypothesis that the optimum opening size should be close to d50 of the solid material seems to be validated. The application of the laboratory observations to the field is indicated based on the energy line and scaling principles.

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“…Zhou et al presented a numerical method combined with a FEM and DEM for simulation of the landslide debris flow under seismic loading [23], while the mechanical parameters are hard to determine. Cascini et al used an enhanced numerical model which combines a 3D depth-integrated hydro-mechanical coupled SPH model for the propagation analysis of debris flows and a 1D vertical FDM model for the evaluation of the pore water pressure [24].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis of the High‐Speed and Long‐Runout Landslide Movement Process Based on the Discrete Element Method: A Case Study of the Shuicheng Landslide in Guizhou, China

Xia

Liu

et al. 2021

Advances in Civil Engineering

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On July 23, 2019, a high-speed and long-runout landslide occurred in Jichang Town, Shuicheng County, Guizhou Province, China, causing 42 deaths and 9 missing. This paper used the discrete element software MatDEM to construct a three-dimensional discrete element model based on digital elevation data and then simulated and analyzed the movement and accumulation process of the landslide. The maximum average velocity of the source area elements reached 14 m/s when passed through the scraping area; meanwhile, the velocity of the scraping area elements increased rapidly. At 90 s, the maximum displacement of the source area elements reached 1358.5 m. The heat generated during the movement of the landslide was mainly the frictional heat, and the frictional heat increased sharply when the source area elements passed through the scraping area. The change of frictional heat has a certain positive correlation with the velocity of the scraping area elements. Finally, the volume of the scraping area elements was 2.4 times greater than the source area elements in the deposits. The scraping effect increases the volume of the sliding body and expands the impact area of the landslide disaster. Additionally, by setting different compressive and tensile strengths as well as internal friction coefficients to analyze the influences of their value changes on the landslide movement process, the results show that the smaller the strengths and internal friction coefficient of the model, the greater the depth and area of the scraping area, which will result in a thicker accumulation; meanwhile, the average displacement, average velocity, and heat will also increase.

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SPH-FDM propagation and pore water pressure modelling for debris flows in flume tests

Cited by 48 publications

References 22 publications

Comparison of SPH boundary approaches in simulating frictional soil–structure interaction

Comparison of SPH boundary approaches in simulating frictional soil–structure interaction

Laboratory investigation of performance of a screen type debris-flow countermeasure

Dynamic Analysis of the High‐Speed and Long‐Runout Landslide Movement Process Based on the Discrete Element Method: A Case Study of the Shuicheng Landslide in Guizhou, China

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