Microcracking Behavior of Gabbro During Monotonic and Cyclic Loading

Ghasemi, Shahram; Khamehchiyan, Mashalah; Taheri, Abbas; Nikudel, Mohammad Reza; Zalooli, Ahmad

doi:10.1007/s00603-021-02381-7

Cited by 20 publications

(9 citation statements)

References 60 publications

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“…With the gradual deepening of the understanding of rock mechanical properties under fatigue loading, scholars began to study the development of internal damage of rocks under fatigue loading. In the process of cyclic loading and unloading, the surface of rock will produce cracks, and judging the internal damage development of rock by the crack volume is also a method adopted by many scholars at present [7][8][9][10]. This method can better reflect the damage state of the rock at various stages under fatigue loading, but the mechanism of the internal damage development of the rock is not clear enough.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Gas Storage Sandstone under Uniaxial Cyclic Loading and Unloading Condition

Zhao

Wu²,

Jun³

et al. 2023

Period. Polytech. Civil Eng.

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In order to study the mechanical properties and damage evolution of the gas storage surrounding rock under the periodic injection-production process, the uniaxial cyclic loading and unloading tests of sandstone were carried out by TFD-2000 microcomputer servo-controlled rock triaxial testing machine. Results shown that the compressive strength of gas storage sandstone specimens were gradually decreases with increasing of the stress amplitude after 200 cycles. The stress-strain curve under uniaxial cyclic loading and unloading condition formed hysteresis loops, and the hysteresis loop presented sparse-dense-sparse when the stress amplitude was relative higher. The residual strains can be divided into three stages of decay deformation stage, stable deformation stage and accelerated deformation stage when the stress amplitude is 8~32 MPa, this phenomenon is very similar to the creep behavior of rocks. The energy evolution of sandstone under cyclic loading and unloading was analyzed and the damage evolution low of which was also discussed in detail, the damage variable defined by energy dissipative ratio accumulation can well reflect the damage development of sandstone under uniaxial cyclic loading and unloading. A nonlinear visco-plastic body was proposed by considering the accelerate stage of curves of the axial residual strains, and used the nonlinear visco-plastic body to replace the visco-plastic body of the traditional Nishihara model, a nonlinear viscoelastic-plastic model for cyclic loads was established and the applicability of the model is verified. The research results provide certain reference value for the construction and maintenance of gas storage.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Gas Storage Sandstone under Uniaxial Cyclic Loading and Unloading Condition

Zhao

Wu²,

Jun³

et al. 2023

Period. Polytech. Civil Eng.

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“…The defective structures determine the non-uniform damage and deformation localization of rock under loading, a research hotspot in rock damage and fracture mechanics (Erarslan and Williams 2012;Zhu et al 2019). The deformation localization of rock is the process of microcrack initiation, propagation, coalescence and macrocrack development (Yuan and Harrison 2006;Ghasemi et al 2021). Revealing the localized deformation process and mechanism of rocks is of great significance to the stability assessment of rock slopes and underground chambers in active tectonic areas (Shen et al 2014;Gischig et al 2016;Zhu et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Quantitative investigation on localized deformation process of rocks by uniaxial test and digital image correlation

et al. 2023

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The uniaxial monotonic and cyclic loading tests were carried out. The acoustic emission (AE) events and surface deformation images in the loading process were obtained using the AE system and digital image correlation (DIC). The variance of the deformation field was introduced to reveal the formation and evolution processes of the localized deformation. The results show that the variance begins to increase significantly in the initiation of the macro-scale failure stage, and it increases sharply under cyclic loading before failure. The shape of the stress-variance hysteresis curve varies with increasing upper limit stress, and four types of stress-variance hysteresis curves were revealed. The damage variables are respectively defined by cumulative AE counts and variance, and the evolution process of damage variable can be divided into crack closure stage, initial damage stage, stable development stage, accelerated development stage and failure stage. By proposing the differentiation rate, it is found that there are apparent failure precursor points under monotonic and cyclic loading.

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“…The influence of cyclic disturbance parameters on the relaxation amplitude, relaxation rate, and peak stress was analyzed. Ghasemi et al [11] conducted monotonic and cyclic loading tests on gabbro specimens to study the evolution of micro-cracking therein under static and dynamic loading. The results indicated that compared with monotonic loading, cyclic loading facilitates the extension of micro-cracks earlier in the rock specimens, and the microcracks are longer.…”

Section: Introductionmentioning

confidence: 99%

Fracture and Damage Characteristics of Granite under Uniaxial Disturbance Loads

Fei

Wang

et al. 2022

Buildings

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To investigate the mechanical properties and damage characteristics of granite under frequent disturbance loads in the process of underground engineering construction, laboratory uniaxial compression tests were conducted on granite under combined dynamic and static loading conditions. The following conclusions were reached: (1) under a dynamic disturbance, the failure stress of granite grows gradually as the initial stress and disturbance load rise due to the coupling of damage and strain-rate effect; (2) the characteristic stresses of granite specimens grow with the increasing amplitude of disturbance Δσ under the disturbing loads; with the same Δσ, the characteristic stresses show an increase trend with the increasing initial stress σm; (3) the particle size distribution of rock fragments broken under the disturbance load follows the fractal law, and the fractal dimension F gradually enlarges with the growth of Δσ, indicative of an increased degree of fragmentation; and (4) the damage variable grows rapidly at first, then steadily, and, finally, shows a rapid growth trend again under the disturbance loads. The Δσ significantly influences the number of cycles and rate of change of the damage variable during the steady increase. This research has certain theoretical significance and engineering guidance value for dynamic disaster recognition and control.

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Microcracking Behavior of Gabbro During Monotonic and Cyclic Loading

Cited by 20 publications

References 60 publications

Mechanical Properties of Gas Storage Sandstone under Uniaxial Cyclic Loading and Unloading Condition

Mechanical Properties of Gas Storage Sandstone under Uniaxial Cyclic Loading and Unloading Condition

Quantitative investigation on localized deformation process of rocks by uniaxial test and digital image correlation

Fracture and Damage Characteristics of Granite under Uniaxial Disturbance Loads

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