Attenuation and Hysteresis of Saturated Rocks Under Cyclic Loading

Chen, Yunping; Dao-ying, XI; Xue, Yan‐Wei

doi:10.1002/cjg2.3547

Cited by 8 publications

(6 citation statements)

References 14 publications

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“…From Figs 8 and 9, it is observed that the curves of ΔU d and Δε p show some fluctuation in each cycle stage before the destruction stage; this phenomenon has also been found in other studies [38][39][40][41][42]. There are many explanations for this phenomenon, but it is generally accepted that a rock mass is composed of micro-structural elements (see Fig 10).…”

Section: Fluctuations Of δε P and δU D Under Tiered Cyclic Loadingsupporting

confidence: 70%

“…When the cyclic stress reaches the failure strength limit of each micro-structural element, local failure occurs and the residual deformation of rock suddenly increases [9,23]. However, other researchers believe that sandstone subjected to cyclic stress displays complex stress-strain characteristics of nonlinearity and hysteresis, owing mainly to nonlinear deformations and the frictional sliding of grain contacts [40][41][42]. The phenomenon of unstable deformation (or unstable damage) of sandstone exactly reflects that sandstone is a natural product of heterogeneity and anisotropy [43,44].…”

Section: Fluctuations Of δε P and δU D Under Tiered Cyclic Loadingmentioning

confidence: 99%

See 1 more Smart Citation

Fluctuation in residual strain and dissipated energy of saturated sandstone under tiered cyclic loading

Jiang¹,

Cheng²,

Duan³

et al. 2020

PLoS ONE

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To study the influence of cyclic stress on the nonlinear behavior of saturated sandstone, the residual strain properties and energy dissipation characteristics of the sandstone under tiered cyclic loading were experimentally investigated. The axial/radial residual deformation and energy dissipation characteristics of sandstone at different cyclic stress stages were analyzed in detail. By combining the mathematical statistics, fluctuation coefficients of the residual strain and energy dissipation, and correlation coefficients of axial/radial residual strain and energy dissipation were defined to describe the process. It was determined that these newly defined physical variables were closely related to the elastic-plastic state (or instability failure state) of the rock.

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Section: Fluctuations Of δε P and δU D Under Tiered Cyclic Loadingsupporting

confidence: 70%

Section: Fluctuations Of δε P and δU D Under Tiered Cyclic Loadingmentioning

confidence: 99%

Fluctuation in residual strain and dissipated energy of saturated sandstone under tiered cyclic loading

Jiang¹,

Cheng²,

Duan³

et al. 2020

PLoS ONE

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show abstract

“…As a natural geological material, rock has a large number of microcracks, pores and other inner defects. The microstructure characteristic of rock results in its nonlinear elastic behavior and significant hysteresis behavior (Chen et al 2003;Li et al 2019). The hysteresis curves of the stress-strain and stress-variance at different stress levels are shown in Fig.…”

Section: Variance Response Characteristicsmentioning

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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“…At the lower loading frequency of 0.05 Hz, the dynamic strength of all cracked samples were lower than their static strength, except for the T-shaped fissure samples of 0 °-90 °and 45 °-90 °(see Figures 11B,C). Because of the working condition of lower frequency and the cycle period is longer than the hysteresis time (e.g., Chen et al, 2004;Wan and Xi. 2009), the strain has sufficient reaction time.…”

Section: Strength Characteristics Under Different Frequenciesmentioning

confidence: 99%

Experimental Study on Mechanical Properties and Cracking Behaviors of T-Shaped Flaw-Contained Rock-like Materials Under Cyclic Loading

et al. 2021

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Geotechnical hazards such as debris flows, rock falls in slopes, rock collapse, and rockburst in underground mining or caverns are tightly correlated to the mechanical behavior of natural rock mass stability. Strength and failure mode of the natural rock mass are governed by the presented fissures. In this paper, samples containing T-shaped fissures with different geometry were prepared by rock-like materials and tested under varying uniaxial cyclic loading compression. The effect of T-shaped fissures with different geometry and the strain rate and loading frequency on the strength of tested samples were studied, and the failure mode of the samples containing T-shaped cross fissures under different working conditions was observed. The results show that the function of the minor fissures was not completely negative, and the strength of T-shaped fissure samples containing a major fissure with different inclination angles presented a varying trend with the increasing included angle between the major and minor fissures. Moreover, the strength of the cracked samples increased with the increase of the strain rate and loading frequency, and the larger the included angles between the major and minor fissures, the more sensitive the T-shaped fissure sample was to the change of frequency, but without a noticeable linear correlation relationship between the strength of the sample and the included angles between the major and minor fissures. In addition, the existence of the minor fissures had a significant impact on the failure mode of the sample, and the failure mode of the samples containing T-shaped cross fissures of the same geometry under the uniaxial compression and the uniaxial cyclic load was equivalent.

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Attenuation and Hysteresis of Saturated Rocks Under Cyclic Loading

Cited by 8 publications

References 14 publications

Fluctuation in residual strain and dissipated energy of saturated sandstone under tiered cyclic loading

Fluctuation in residual strain and dissipated energy of saturated sandstone under tiered cyclic loading

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

Experimental Study on Mechanical Properties and Cracking Behaviors of T-Shaped Flaw-Contained Rock-like Materials Under Cyclic Loading

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