CFD-DEM modeling of geotextile clogging in tunnel drainage systems

Ibrahim, Ahmed; Meguid, Mohamed A.

doi:10.1016/j.geotexmem.2022.06.001

Cited by 10 publications

(4 citation statements)

References 44 publications

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“…When designing and optimizing relevant mechanical components, contacts between relative components and the Cyperus esculentus seeds occur. To analyze these contacts, an increasing number of scholars have used the discrete element method (DEM) [1][2][3][4][5][6][7][8], which is a type of numerical simulation method that was used to simulate the motion behavior of granular materials. DEM can describe the translation and rotation of particles using Newton's Second Law and Euler's dynamic equation, respectively.…”

Section: Introductionmentioning

confidence: 99%

Study on Verification Approach and Multicontact Points Issue When Modeling Cyperus esculentus Seeds Based on DEM

Zhang

Jiang

et al. 2023

Processes

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In this paper, the Multisphere (MS) models of three varieties of Cyperus esculentus seeds are modeled based on DEM. In addition, for comparison, other particle models based on automatic filing in EDEM software are also introduced. Then, the direct shear test, piling test, bulk density test, and rotating hub test are used to verify the feasibility of particle models of Cyperus esculentus seeds that we proposed. By comparing the simulated results and experimental results, combined with the CPU computation time, the proposed particle models achieved better simulation accuracy with fewer filing spheres. According to simulation results, some limitation was present when using one single verification test; varieties of verification tests used could improve the verification reliability, and a more appropriate particle model could be selected. Additionally, the issue of multicontact points in the MS model was studied. The Hertz Mindlin (no slip) (HM) model and Hertz Mindlin new restitution (HMNR) model were both considered in simulations for comparison. The rotating hub test and particle–wall impact test were used, and the influences of multiple contact points on the motion behavior of individual particles and particle assemblies were analyzed. Simulation results showed that the multiple contact points affected the motion behavior of individual particles; in contrast, the influence of multiple contact points on the motion behavior of the particle assembly was insignificant. Moreover, the relationships between moisture content of seeds and Young’s modulus, Young’s modulus, and the number of contact points were also considered. Young’s modulus decreased with increasing moisture content. The number of contact points increased with a decreasing Young’s modulus.

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Section: Introductionmentioning

confidence: 99%

Study on Verification Approach and Multicontact Points Issue When Modeling Cyperus esculentus Seeds Based on DEM

Zhang

Jiang

et al. 2023

Processes

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“…The DEM is presently mostly employed in civil engineering for the modeling the micro‐mechanical response of granular (e.g., sand 42 ) and blocky (e.g., masonry 43 ) materials, that is. discontinuous systems.…”

Section: Meso‐scale Dem‐based Simulation Of Rc Columnsmentioning

confidence: 99%

A new Distinct Element meso‐model for simulating the rocking‐dominated seismic response of RC columns

Scattarreggia

Malomo

DeJong

2022

Earthq Engng Struct Dyn

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The rocking-dominated seismic response of reinforced concrete (RC) columns is a complex mechanism that entails P-Δ effects, concrete crushing and spalling, rupture and dislocation of steel bars and stirrups, as well as combined localized failures causing splitting and shear-flexure cracking. In this paper, we present a new meso-scale numerical modeling strategy for the detailed simulation of the rocking response of slender RC columns under seismic actions. This work advances the current state-of-the-art by exploring the unprecedented use of the Distinct Element Method (DEM), originally conceived for geotechnical studies and whose applicability in earthquake engineering has been primarily limited to the assessment of unreinforced masonry sub-structures. To decrease analysis time and enable the use of DEM for RC problems, concrete is herein idealized as an assembly of solid macro-block layers of size directly proportional to their distance from expected plastic hinges. These layers are connected by nonlinear interface springs to simulate tensile and shear cracking via a simplified Mohr-Coulomb criterion. Crushing of concrete in deformable blocks is modeled using the Feenstra and De Borst strain-softening linearized compression law, while confinement and combined failures are accounted for numerically through the explicit representation of longitudinal and transversal reinforcement bars, idealized as link elements. Previous experimental static and dynamic tests on full-scale RC column specimens and results from fiber-based Finite Element and sectional analysis models are used to evaluate DEM results and quantify the influence of key modeling parameters, including block number and deformability, as well as the amount of damping. The agreement between simulated failure modes and force and displacement capacities and their experimental counterparts demonstrate the applicability of the proposed approach, while demonstrating the pros and cons of simplified numerical methods.

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“…Although it has a signi cant effect on water pressure reduction outside the liner compared to full closure, it only has a signi cant pressure reduction effect on the pressure around the tunnel arch wall. On the material side, conducted in-plane permeability tests of drained geotextile lters to assess their mechanism of hydraulic deterioration in tunnels [24,25]. Introduced an optimal lightweight foam mortar mixture for promoting tunnel drainage using the composite lining method [26].…”

Section: Introductionmentioning

confidence: 99%

FEM analysis of a new three-way drainage and pressure reduction system for road tunnels

Teng

Liu

Mei

et al. 2023

Preprint

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For the water-rich area tunnel elevation arch in the high-water pressure often causes elevation arch cracking and leakage, bulging and other disasters. When the drainage system is not designed properly, such disasters occur more frequently, and conventional road tunnel drainage cannot effectively reduce the water pressure at the elevation arch. Therefore, this paper proposes a new concept of "three-way drainage". The three-way drainage system is based on the conventional drainage system with a new drainage inlet at the elevation arch. On this basis, a series of numerical simulation studies are conducted to verify the pressure-reducing performance of the three-way drainage system on the lining. After demonstration and analysis, the three-way drainage concept can not only effectively reduce the water pressure at the elevation arch of the tunnel, but also have a significant effect on the overall drainage effect of the tunnel. The factors affecting the performance of the three-way drainage system are discussed by varying the model parameters. It was found that the hydraulic conduction coefficient of the surrounding rock and initial support, the number of reverse diversion holes in the elevation arch, the change in head height and the change in secondary lining parameters all had a significant effect on the water pressure outside the tunnel.

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CFD-DEM modeling of geotextile clogging in tunnel drainage systems

Cited by 10 publications

References 44 publications

Study on Verification Approach and Multicontact Points Issue When Modeling Cyperus esculentus Seeds Based on DEM

Study on Verification Approach and Multicontact Points Issue When Modeling Cyperus esculentus Seeds Based on DEM

A new Distinct Element meso‐model for simulating the rocking‐dominated seismic response of RC columns

FEM analysis of a new three-way drainage and pressure reduction system for road tunnels

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