Modeling of Creep Behavior of an Argillaceous Rock by Numerical Homogenization Method

Dahhaoui, Hachimi; Belayachi, Naïma; Zadjaoui, Abdeldjalil

doi:10.3311/ppci.11697

Cited by 7 publications

(5 citation statements)

References 36 publications

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“…The main deformation of the rock corresponds to recoverable elastic deformation, which led to the appearance of a plastic strain stability zone. After entering the plastic stage at σ = 12.5 MPa, the primary and secondary pores of the rock expanded and connected with each other, and the deformation was produced mostly in the form of non-linear and viscoplasticity [26]. This led to the dominant position of plasticity, the rapid increase in plastic strain, and increasing damage to the rock due to pore coalescence behaviour.…”

Section: Influence Of Loading Rate On Deformation Characteristicsmentioning

confidence: 99%

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Influence of Loading Rate on the Energy Evolution Characteristics of Rocks under Cyclic Loading and Unloading

Liu

Zhou

et al. 2020

Energies

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To analyse the effect of loading rate on the energy evolution of rocks under cyclic loading and unloading, tests on saturated limestone were conducted at loading rates of 0.15, 0.2, and 0.3 mm/min, and the evolution characteristics of plastic, elastic, dissipation, and input energies were examined under different loading rates. The results indicated that the plastic strain in the entire test was directly proportional to the loading rate. In addition, strength, residual stress, plastic energy, and dissipation energy under residual resistance were inversely proportional to the loading rate. The plastic strain exhibited a decreasing–stabilising–increasing trend, and the smaller loading rate delayed the “increasing” trend. The increasing extent of each energy exhibited the following trend: input > elastic > plastic > dissipation energy. Furthermore, the first three types of energy exhibited a slow–fast–slow–fast increase trend. The dissipation energy exhibited a fast–steady–fast–slow–fast increase trend. Additionally, the elastic energy index exhibited a large increase–steady increase–decrease trend, which was proportional to the loading rate. The damping ratio exhibited a decrease–increase–decrease–increase–decrease trend which was proportional to the loading rate in the compaction stage and inversely proportional to the plastic stage.

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Section: Influence Of Loading Rate On Deformation Characteristicsmentioning

confidence: 99%

“…Energies 2020, 13, x FOR PEER REVIEW 5 of 16 produced mostly in the form of non-linear and viscoplasticity [26]. This led to the dominant position of plasticity, the rapid increase in plastic strain, and increasing damage to the rock due to pore coalescence behaviour.…”

Section: Deformation Characteristics Before Peak Strengthmentioning

confidence: 99%

Influence of Loading Rate on the Energy Evolution Characteristics of Rocks under Cyclic Loading and Unloading

Liu

Zhou

et al. 2020

Energies

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“…Micro-fracture precursors and its spatial-temporal evolution of tunnel surrounding rock during the creep process are studied. Hachimi Dahhaoui, et al [11] studied creep behavior of argillaceous rock, and proposed time dependent modeling is based on a numerical homogenization method. The results show how numerical homogenization method is capable of effectively modelling macroscopic creep deformation.…”

Section: Introductionmentioning

confidence: 99%

Study on the Time-lag Failure of Sandstone With Different Degrees of Unloading Damage

Qiao

Luo

et al. 2019

Period. Polytech. Civil Eng.

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The unloading effect of rock mass excavation is an inevitable practice, and it’s often characterized by a relatively large-scale engineering hazard with a noticeable time lag.A set of unloading triaxial tests were conducted on a sandstone rock to establish the deformation law and the threshold time. Based on the renormalization group theory, the unloading sandstone model was developed by considering the interaction between particles. Similarly, a logistic model was used to predict the unloading damage of sandstone. The unloading time lag damage of sandstone rock was predicted by using the damage threshold. The research shows that: (1) The higher the degree of unloading, the shorter the time-lag failure. (2) The damage range of critical values was optimized. (3) The error between the predicted value and the experimental value of the time threshold was almost less than 5 %, the prediction result was found to be good, and the employed logistic evolution model was reasonable. The findings of this research provide a prediction method and precise information about the mechanism of unloading time lag deformation. Therefore, it can be used as a reference for excavation-support design of underground structures.

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“…Under such conditions, the stress and deformation characteristics will change slowly with changes in time. Thus, these rock time-dependent characteristics directly cause instability and damage to the rock mass [2], [3]; therefore, mastering the creep deformation law can effectively reflect the time-dependent characteristics. Accordingly, studying the rock creep mechanical properties…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effects of Ambient Freeze–Thaw Cycling on Creep Mechanical Properties of Sandstone Under Step Loading

Zhu

Zhou

et al. 2019

IEEE Access

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In order to study the creep mechanical properties of sandstone subjected to graded loading under the condition of freeze-thaw cycles, 15 freeze-thaw cycles were conducted with four groups of rock samples. The porosity variation of sandstone before and after the freeze-thaw cycles were obtained by using the nuclear magnetic resonance (NMR) technique. The results show that under the action of freeze-thaw cycles, the cohesion between particles inside the rock decreases, the pore structure deteriorates continuously, and the porosity of the rocks increases. During the graded loading creep test, the rock underwent macroscopic failure under low-level loading. Moreover, the fracture morphology showed tensileshear failure characteristics, which caused obvious decreases in the long-term strength of the rock. The comprehensive analysis of the experimental data to establish the creep model and constitutive equation under the condition of the freeze-thaw cycle, and discuss the relationship between creep model parameters and freeze-thaw factors. The nonlinear creep mode can effectively reflect the graded loading creep law of frozen and thawed sandstone.INDEX TERMS Constitutive model, creep characteristics, freeze-thaw cycle, mesoscopic damage law.

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Modeling of Creep Behavior of an Argillaceous Rock by Numerical Homogenization Method

Abstract: Abstract

Cited by 7 publications

References 36 publications

Influence of Loading Rate on the Energy Evolution Characteristics of Rocks under Cyclic Loading and Unloading

Influence of Loading Rate on the Energy Evolution Characteristics of Rocks under Cyclic Loading and Unloading

Study on the Time-lag Failure of Sandstone With Different Degrees of Unloading Damage

Experimental Investigation on the Effects of Ambient Freeze–Thaw Cycling on Creep Mechanical Properties of Sandstone Under Step Loading

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