A dynamic bounding surface plasticity damage model for rocks subjected to high strain rates and confinements

Huang, Linchong; Liang, Jiguan; Ma, Jianjun; Chen, Wanxiang

doi:10.1016/j.ijimpeng.2022.104306

Cited by 16 publications

(8 citation statements)

References 49 publications

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“…Extrinsic CZMs have two main limitations: (1) The global stiffness matrix may become ill‐conditioned if the stiffness of the cohesive elements is infinite at the initiation of crack debonding 36 ; (2) It is not feasible to reflect the stress‐dependent history of the host material in the cohesive element, which does not exist prior to debonding. In rock mechanics, the confining stress and the loading history have a substantial impact on stiffness and strength, 37–40 and so, the applicability of extrinsic models is limited.…”

Section: Introductionmentioning

confidence: 99%

Rock fracture propagation in a damage zone by a constitutive model coupling volume and cohesive elements

He,

Arson

2024

Num Anal Meth Geomechanics

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This paper presents a method to simulate fracture propagation in a damage zone in 2D, whereby Cohesive Zone (CZ) elements are assigned the same Continuum Damage Mechanics (CDM) model as their adjacent finite elements. Material hardening is a result of damage‐induced stiffness reduction in the finite and cohesive elements, while softening is modeled by cohesive debonding only. The damage components calculated at the numerical integration points of each finite element are averaged and that average is assigned to the nodes of the adjacent CZ elements. CZ element debonding triggers when a critical damage threshold is reached, beyond which, a linear softening law is used in both mode I and mode II. The proposed model is calibrated against published triaxial compression tests conducted on shale. Single‐CZ element simulations confirm that, below the critical damage threshold, elastic deformation energy is stored and energy is dissipated by damage propagation and irreversible deformation. Passed the critical damage threshold, stored elastic energy is released in the form of cohesive debonding energy. Borehole breakout simulations indicate that the proposed CDM‐based CZ model can predict the formation of spiral‐shaped fractures around a free circular cavity under biaxial stress. Simulations of fracture propagation in textured materials suggest that cohesive debonding within and between grains is triggered by the coalescence of localized zones of continuum damage, and that the grain size distribution affects both the fracture pattern and the softening behavior of the specimen considered.

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Section: Introductionmentioning

confidence: 99%

Rock fracture propagation in a damage zone by a constitutive model coupling volume and cohesive elements

He,

Arson

2024

Num Anal Meth Geomechanics

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“…A large number of scholars have carried out research work on theoretical aspects of rock masses and numerical simulations [2][3][4][5][6][7]. Te inversion method using a combination of actual measurements and numerical calculations is one of the efective methods to obtain the mechanical parameters of the surrounding rocks.…”

Section: Introductionmentioning

confidence: 99%

Inversion Study of Mechanical Parameters of Tunnel Surrounding Rock Based on Similar Test

Wang

Cui

et al. 2023

Advances in Civil Engineering

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Based on similar model tests and finite element simulations, inversion study of the mechanical parameters of the tunnel surrounding rock by combining artificial fish swarm algorithm (AFSA) and digital scattering correlation method is carried out. The inversion of the mechanical parameters of the tunnel surrounding rock is carried out by iterating the optimization algorithm to minimize the objective function value through similar model test with the displacement measurements obtained by the digital scattering correlation method as the known quantity and the nodal displacement simulation values obtained by numerical simulation as the unknown quantity. The results show the following: (1) The new research idea proposed in this paper is effective and feasible and can perform the inversion calculation of the parameters of the soft and weak tunnel surrounding rock. (2) Through the inversion calculation, the parameters related to the surrounding rock show a wave-like change: the parameters increase in the initial and final compaction stages due to the small deformation rate of the tunnel and decrease in the continuous loading stage due to the increasing deformation rate of the tunnel. (3) The displacement field calculated by DSCM in the test is basically the same as the displacement distribution characteristics of the numerical simulation displacement cloud map, and the error of nodal displacement value is within 3%.

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“…Stamatopoulos [23] studied the seismic performance of wind turbines supported by circular extended foundations using current Greek seismic codes. Dai [24][25][26][27][28] evaluated that the structural response of the embedded ring showed significant vertical displacement during turbulent wind speed.…”

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Response Characteristics of Circular Extended Foundation of Large Wind Turbine Generator

et al. 2022

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In order to study the dynamic response characteristics of circular extended foundation of wind turbine in mountainous areas, a 1:10 scaled model test was carried out on the circular extended foundation of 2MW wind turbine, and the deformation characteristics of wind turbine foundation under random wind load were analyzed by ABAQUS numerical calculation. The results show that: (1) The wind turbine foundation has different stress types on the windward side and the leeward side. The components of the windward side foundation are subjected to tensile stress, while the components of the wind turbine leeward side foundation are subjected to compressive stress. (2) The strain of the foundation bolt, the strain of the foundation ring, and the strain of the foundation plate are within the allowable range of material deformation, but the relative deformation of the windward side and the leeward side is quite different. (3) The numerical calculation results of wind turbine foundation under strong wind load are compared with the failure results of scale model experiment, which shows that the overall overturning failure of foundation is a dynamic response mode of wind turbine foundation. In the design and construction, it is necessary to strengthen the research on the windward side and the leeward side and strengthen the anti-overturning design of the wind turbine expansion foundation.

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A dynamic bounding surface plasticity damage model for rocks subjected to high strain rates and confinements

Cited by 16 publications

References 49 publications

Rock fracture propagation in a damage zone by a constitutive model coupling volume and cohesive elements

Rock fracture propagation in a damage zone by a constitutive model coupling volume and cohesive elements

Inversion Study of Mechanical Parameters of Tunnel Surrounding Rock Based on Similar Test

Study on Dynamic Response Characteristics of Circular Extended Foundation of Large Wind Turbine Generator

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