Experimental Study on Stiffness Degradation of Rock Under Uniaxial Cyclic Sinusoidal Compression Loading

Arora, Ketan; Chakraborty, Tanusree; Rao, K. Seshagiri

doi:10.1007/s00603-019-01835-3

Cited by 44 publications

(11 citation statements)

References 19 publications

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“…And, the fatigued life of specimen subjected to discontinuous cyclic compression decreased sharply in comparison with conventional fatigued tests (Fan et al, 2019). Loading frequency affects the fatigued strength as well as the deformation of rock specimen (Arora et al, 2019). The level of confining pressure had a significant influence on the cyclic dynamic deformation and fatigued damage evolution of the rock samples (Liu and He, 2012).…”

Section: Introductionmentioning

confidence: 99%

Failure Behavior of the Thermal Treated Granite under Triaxial Cyclic Loading-unloading Compression

Tian

Yang

Wang

et al. 2020

Preprint

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The failure behavior of thermal treated granite under triaxial tiered cyclic loading-unloading compression has a significant effect on the safe and stable operation of HLW disposal repository. Therefore, the stress-strain curves, elastic modulus, Poisson's ratio, plastic strain, dissipated energy and failure characteristic of the thermal treated granite specimens under triaxial compression were analyzed by experiment and numerical simulation. The results indicate that the elastic, Poisson's ratio, axial plastic strain, dissipated energy and accumulative AE counts slightly increase with cyclic loading at initial loading and elastic deformation stage when T = 25 and 300°C, which means that less damage was induced by cyclic loading. However, damage occurred once cyclic loading was applied when T = 600°C. Radial strain even showed compressive characteristic in the initial stage, which indicates that grains adjustment occurred under triaxial cyclic loading-unloading compression. And, the compressive characteristic is more obvious with the increase of temperature or the decrease of confining pressure. The failure modes under triaxial cyclic loading are more complicated than that under triaxial monotonic loading, which make the shear plane rougher. Therefore, the residual strength is higher than that under monotonic loading. When T = 600°C, micro-crack continuously increases under uniaxial unloading and loading process, which result in a decrease of the peak strength under cyclic loading compared with that under monotonic loading.

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Section: Introductionmentioning

confidence: 99%

Failure Behavior of the Thermal Treated Granite under Triaxial Cyclic Loading-unloading Compression

Tian

Yang

Wang

et al. 2020

Preprint

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“…When studying the fatigue properties of rock, the cyclic loading and unloading method of axial stress is generally used for research. In the cyclic loading and unloading test, there are many factors affecting the strength of rock, such as loading frequency, temperature, stress amplitude, and cycle number [4][5][6]. These factors have different effects on the fatigue strength of rock.…”

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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“…To ensure the long stability of rock structures, considerable efforts have been put into revealing the effect of cyclic loading on rock mechanical behaviors. The effect of cyclic loads on rock hardening characteristics or degradation was analyzed in terms of deformation, fracture, energy dissipation, damage modeling, and so forth 7–10 . The previous constant‐amplitude cyclic loading tests and variable‐amplitude cyclic loading tests have shown that the fatigue mechanical response of rock is impacted by the stress paths, such as stress frequency, 11–14 stress level, 15,16 and stress amplitude 17,18 .…”

Section: Introductionmentioning

confidence: 99%

“…The effect of cyclic loads on rock hardening characteristics or degradation was analyzed in terms of deformation, fracture, energy dissipation, damage modeling, and so forth. [7][8][9][10] The previous constant-amplitude cyclic loading tests and variable-amplitude cyclic loading tests have shown that the fatigue mechanical response of rock is impacted by the stress paths, such as stress frequency, [11][12][13][14] stress level, 15,16 and stress amplitude. 17,18 Among many of the factors, stress frequency is always the main aspect.…”

Section: Introductionmentioning

confidence: 99%

Effect of prior cyclic damage on rock failure exposed to triaxial multistage unloading confining pressure and cyclic loads

Wang

Han

Cai

2022

Fatigue Fract Eng Mat Struct

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A series of triaxial alternative unloading and damage-controlled cyclic loading tests were conducted on deeply buried granodiorite. The testing results reveal that the prior cyclic loading damage influences rock volumetric deformation, stiffness degradation, damage evolution, and failure modes. Rock volumetric deformation and hysteresis ratio increase with increasing prior cyclic damage, and the subsequent damage propagation is the most severe for a sample subjected to high cyclic damage. A larger hysteresis ratio indicates large plastic deformation and energy loss. In addition, a damage evolution model was proposed based on the irreversible radial strain, and it well describes the damage propagation at the respective cyclic loading stage (CLS) and unloading confining pressure stage (UCPS). Moreover, as prior damage increases, the dominant failure mode changes from shear failure to mixed shear-tensile failure and then to tensile failure. It is suggested that rock failure is cyclic damage dependent; damage fully develops under high cyclic damage.

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Experimental Study on Stiffness Degradation of Rock Under Uniaxial Cyclic Sinusoidal Compression Loading

Cited by 44 publications

References 19 publications

Failure Behavior of the Thermal Treated Granite under Triaxial Cyclic Loading-unloading Compression

Failure Behavior of the Thermal Treated Granite under Triaxial Cyclic Loading-unloading Compression

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

Effect of prior cyclic damage on rock failure exposed to triaxial multistage unloading confining pressure and cyclic loads

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