A coupled damage-plasticity DEM bond contact model for highly porous rocks

TY - GEN

T1 - A coupled damage-plasticity DEM bond contact model for highly porous rocks

AU - Zheng, Jinhui

AU - Ciantia, Matteo

AU - Previtali, Marco

AU - Knappett, Jonathan

PY - 2024/4/10

Y1 - 2024/4/10

N2 - In view of the significant stress loss induced by structural collapse when simulating high-porous soft rocks using traditional damage bond models in DEM ( discrete element method) modelling, a novel damage bond contact model is proposed to capture the ductile failure of high-porous cemented soft rocks. To address the unrealistic physical contact distribution resulting from the use of spherical particles in DEM modelling and consider the physical presence of broken bonds, far-field interaction is introduced between grains when two untouched particles reach a specific activation gap, enabling the generation of stable, highly porous open structure samples while using spherical DEM particles. The final results demonstrate that this newly developed model facilitates the transition from the purely elastic rock-like behaviour stage to the transitional ductile failure stage of porous soft rocks, as well as reproduces the softening/hardening response of soft rocks under different confinements.

AB - In view of the significant stress loss induced by structural collapse when simulating high-porous soft rocks using traditional damage bond models in DEM ( discrete element method) modelling, a novel damage bond contact model is proposed to capture the ductile failure of high-porous cemented soft rocks. To address the unrealistic physical contact distribution resulting from the use of spherical particles in DEM modelling and consider the physical presence of broken bonds, far-field interaction is introduced between grains when two untouched particles reach a specific activation gap, enabling the generation of stable, highly porous open structure samples while using spherical DEM particles. The final results demonstrate that this newly developed model facilitates the transition from the purely elastic rock-like behaviour stage to the transitional ductile failure stage of porous soft rocks, as well as reproduces the softening/hardening response of soft rocks under different confinements.

KW - Displacement pile

KW - Large deformations

KW - DEM

KW - GPFEM

KW - Installation

KW - Chalk

UR - https://sites.google.com/view/ukacm2024conference/programme

M3 - Conference contribution

SP - 132

EP - 135

BT - Proceedings of the 2024 UK Association for Computational Mechanics Conference

A2 - Coombs, William M.

PB - Durham University

T2 - Annual Conference of the UK Association for Computational Mechanics.

Y2 - 10 April 2024 through 13 May 2024

ER -