Dynamic strain localization into a compaction band via a phase-field approach

Journal of the Mechanics and Physics of Solids, Journal Year: 2023, Volume and Issue: 173, P. 105228 - 105228

Published: Feb. 2, 2023

We present a new phase-field formulation for the formation and propagation of compaction band in high-porosity rocks. Novel features proposed include (a) effects inertia on rate development bands, (b) degradation mechanisms tension, compression, shear appropriate dynamic strain localization problems where disturbances propagate time wave-like fashion to induce micro-cracking, grain crushing, frictional rearrangement rock. also robust numerical technique handle spatiotemporal evolution band. validate model by simulating benchmark problem involving V-shape notched cylindrical specimen Bentheim sandstone tested conventional triaxial compression. The is shown reproduce different geometric styles deformation that pure compaction, shear-enhanced combination mechanism consists straight primary surrounded secondary chevron bands.

Language: Английский

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A double-yield-surface plasticity theory for transversely isotropic rocks

Acta Geotechnica, Journal Year: 2022, Volume and Issue: 17(11), P. 5201 - 5221

Published: June 24, 2022

Language: Английский

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Computational coupled large‐deformation periporomechanics for dynamic failure and fracturing in variably saturated porous media

International Journal for Numerical Methods in Engineering, Journal Year: 2022, Volume and Issue: 124(1), P. 80 - 118

Published: Aug. 26, 2022

The large-deformation mechanics and multiphysics of continuous or fracturing partially saturated porous media under static dynamic loads are significant in engineering science. This article is devoted to a computational coupled periporomechanics paradigm assuming passive air pressure for modeling failure variably media. governing equations bulk fracture material points formulated the current/deformed configuration through updated Lagrangian-Eulerian framework. It hypothesized that horizon mixed point remains spherical, its neighbor determined current configuration. As contribution, interface/phreatic near phreatic line explicitly considered transition from partial full saturation (vice versa) peridynamic state concept. We have constitutive correspondence principle stabilization scheme framework interface points. numerically implement large deformation fully implicit fractional-step algorithm time hybrid meshfree method space. Numerical examples presented validate implemented stabilized demonstrate efficacy robustness

Language: Английский

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An SPH framework for drained and undrained loading over large deformations

International Journal for Numerical and Analytical Methods in Geomechanics, Journal Year: 2024, Volume and Issue: 48(12), P. 3227 - 3257

Published: June 14, 2024

Abstract We propose a new approach for performing drained and undrained loading of elastoplastic geomaterials over large deformations using smoothed particle hydrodynamics (SPH), meshfree continuum method, combined with the modified Cam Clay (MCC) model critical state soil mechanics. The numerical draws upon novel one‐particle two‐phase penalty‐method based formulation handling in saturated soils, which allows tracking buildup pore‐water pressures under shearing compression. Large‐scale parallelized simulations are employed to accommodate significant number degrees freedom three‐dimensional setting. After verification benchmark testing, SPH is used analyze propagation reverse faults through fluid‐saturated clay deposits rupture strike‐slip across earthen embankments. computational methodology tests robustness situations where tends dilate on ‘dry’ side line compact ‘wet’ side, but cannot, because incompressibility constraint imposed by loading. Our results extend current understanding fault modeling further demonstrate potential our framework together method deformation analyses complex problems geotechnics.

Language: Английский

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A constitutive framework for rocks undergoing solid dissolution

Journal of the Mechanics and Physics of Solids, Journal Year: 2023, Volume and Issue: 173, P. 105198 - 105198

Published: Jan. 7, 2023

Language: Английский

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Influence of deflector on the impact dynamics of debris flow against rigid barrier

Engineering Geology, Journal Year: 2023, Volume and Issue: 321, P. 107135 - 107135

Published: May 8, 2023

Language: Английский

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Regularized SPH model for soil–structure interaction with generalized frictional boundary

International Journal for Numerical and Analytical Methods in Geomechanics, Journal Year: 2023, Volume and Issue: 47(10), P. 1852 - 1875

Published: April 23, 2023

Abstract This paper proposes a regularized smoothed particle hydrodynamics (SPH) scheme to solve the problems of tensile instability and stress noise in large‐deformation soil–structure interaction. Particle shifting regularization are combined maintain uniform stresses distributions. A generalized frictional boundary condition is presented model interfaces with abitrary friction coefficients. modified technique developed regularize particles near boundaries. Furthermore, GPU acceleration algorithm adopted improve efficiency. The proposed compared conventional SPH methods using numerical examples, including collapse three‐dimensional granular column, cohesive soil, pipe penetrates into soft clay. comparison indicates that can give highly accurate results for interaction arbitrary coefficient.

Language: Английский

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Study on snow removal characteristics and safety of the high-speed train operating through a snowdrift based on SPH-FEM coupling method

Cold Regions Science and Technology, Journal Year: 2025, Volume and Issue: unknown, P. 104444 - 104444

Published: Jan. 1, 2025

Language: Английский

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Numerical modeling of caldera formation using Smoothed Particle Hydrodynamics (SPH)

Geophysical Journal International, Journal Year: 2023, Volume and Issue: 234(2), P. 887 - 902

Published: March 24, 2023

SUMMARY Calderas are kilometer-scale basins formed when magma is rapidly removed from shallow storage zones. Despite extensive previous research, many questions remain about how host rock material properties influence the development of caldera structures. We employ a mesh-free, continuum numerical method, Smoothed Particle Hydrodynamics (SPH) to study formation, with focus on role properties. SPH provides several advantages over approaches (finite element or discrete methods), naturally accommodating strain localization and large deformations while employing well-known constitutive models. A elastoplastic model simple Drucker–Prager yield condition can explain observations analogue sandbox models development. For this loading configuration, shear band orientation primarily controlled by angle dilation. Evolving orientation, as commonly observed in experiments, requires where frictional strength dilatancy decrease strain, approaching state zero volumetric rate. This also explains recorded loads down-going trapdoor experiments. Our results, combined theoretical scaling arguments, raise use formation. Finally, we apply 2018 collapse at Kīlauea volcano conclude that must exhibit relatively low inferred near-vertical ring faults.

Language: Английский

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Reverse fault slip through soft rock and sand strata by centrifuge modeling tests

Acta Geotechnica, Journal Year: 2022, Volume and Issue: 17(8), P. 3337 - 3356

Published: Jan. 16, 2022

Language: Английский

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