Dynamic mechanical behavior and fatigue damage evolution of sandstone under cyclic loading

Sun, Bi; Zhu, Zhende; Shi, Chong; Luo, Zhihua

doi:10.1016/j.ijrmms.2017.03.003

Cited by 84 publications

(24 citation statements)

References 29 publications

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“…Fan et al [19] have shown that the cyclic life of rock salt in the cyclic creep test is significantly reduced within a certain range, and an empirical model of cycle life and interval time is established. In addition, many scholars [20][21][22][23][24] have studied the damage model of rocks under cyclic loading. However, the damage model for rock salt under cyclic creep loads is rarely studied.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Damage Model Study of Rock Salt Subjected to Cyclic Loading and Cyclic Creep

Zhao

Huang

Liu

et al. 2020

Advances in Civil Engineering

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Due to the gas injection and production of underground salt caves during the operational phase, rock salt is often subjected to a combined stress of cyclic pressure and constant pressure. In order to investigate the damage evolution of rock salt under different combined stresses, the uniaxial cyclic loading test and cyclic creep test were carried out. The stress-strain curves, energy characteristics, energy dissipation, and damage of rock salt in the two experiments were analyzed and compared. The test results show that the stress-strain curves of the two tests presented three stages of “sparse”-“dense”-“sparse.” As the maximum stress increases, the stage of “dense” will decrease and the rock salt cycle life will decrease. The relationship between cycle life and Δσ (difference between maximum and minimum stress in the tests) is an exponential function under cyclic loading and a linear relationship under cyclic creep. Based on the experimental data, the energy dissipation of rock salt is analyzed. The damage variables were defined from the perspective of energy dissipation, and the damage evolution of rock salt under two tests was obtained. There are three corresponding stages of energy dissipation and damage: initial, constant speed, and acceleration. The damage model is obtained by inverse functioning the s function, and then the correction coefficient is added to the model to obtain the modified damage model. The modified damage model is compared with the experimental data. The results show that the model can accurately describe the three stages of rock salt damage. The significance of parameters in the modifying damage model is also discussed.

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Section: Introductionmentioning

confidence: 99%

Experimental Study and Damage Model Study of Rock Salt Subjected to Cyclic Loading and Cyclic Creep

Zhao

Huang

Liu

et al. 2020

Advances in Civil Engineering

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“…[4][5][6][7][8][9] The characteristics of the mechanical and seepage properties of coal and rock masses under cyclic loading-unloading are significantly different from those under monotonic loading. [10][11][12] To further investigate the dynamic characteristics of coal and rock masses in mining, it is necessary to study the deformation and seepage characteristics of coal and rock masses under triaxial cyclic loading-unloading to reveal information about the precursor conditions for rock burst and coal and gas outburst disasters, which has great importance for reducing coal mine dynamics disasters.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on evolution in the characteristics of permeability, deformation, and energy of coal containing gas under triaxial cyclic loading‐unloading

Chu

Sun

Zhang

2019

Energy Science & Engineering

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To further more deeply understand the influence of cyclic loading‐unloading on coal seams during mining and reduce the rock burst and coal and gas outburst disasters and ensure safety during coal mining, triaxial cyclic loading‐unloading tests were performed on coal samples. The permeability recovery rate, residual deformation, and dissipated energy ratio were defined to analyze the evolution in the characteristics of permeability, deformation, and energy observed during the triaxial cyclic loading‐unloading test. The results show as following: (a) The absolute permeability recovery rate first gradually decreases and then increases before failure, while the relative permeability recovery rate decreases sharply during the compaction stage, remains stable during the elastic phase, and gradually increases before failure; (b) The cumulative residual deformation increases with increase number of cyclic loading‐unloading, while relative residual deformation first decreases gradually, then stabilities, and then rises sharply before failure; (c) With increases in deviatoric stress, the total energy of coal samples increased as an exponential function. The dissipated energy ratio gradually decreased in the initial stages of cyclic loading‐unloading, then tended to stabilize in the elastic stage and then increase gradually before failure. This study provides precursor conditions for the early warning of rock burst and coal and gas outburst disasters, which has great importance for reducing coal mine dynamics disasters.

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“…e mechanical properties, energy dissipation laws, and damage characteristics for different rock types under complex stress conditions are slightly different under different confining pressures [5,18,21,22]. Hence, the energy conversion laws and the establishment of appropriate specific energy parameters that relate to the energy play a prominent part in the analysis of the damage of the rock and its evolution characteristics [23,24].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics and Energy Evolution Laws for Red Bed Rock of Badong Formation under Different Stress Paths

Wen

Tang

Wang

et al. 2019

Advances in Civil Engineering

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Exploring mechanical properties of red bed rock of Badong Formation Section two (b2) from the Three Gorges Reservoir is crucial to determine the instability mode of reservoir slopes. In order to reveal the energy evolution laws for b2 rocks under different stress paths, loading tests, unloading tests, and cyclic loading-unloading tests were conducted, respectively. The results show that stress paths have significant influences on the mechanical properties and energy evolution characteristics of b2 rocks and the failure mechanism under three stress paths is revealed. Relative to the loading tests, the mechanical parameters of b2 rocks are deteriorated under the unloading conditions. In addition, the increasing trend of cumulative dissipation energy (CDE) is similar with that of total absorption energy (TAE) and the ESE-strain curves are characterized by multistep rise. For cyclic loading-unloading tests, the areas of hysteretic loop gradually increase as the cycle times increase, and the TAEs and the coefficient of the cumulative dissipation energy (CCDE) also increase gradually with approximately linear characteristics, while the CDEs gradually increase in an abrupt rate. This work can contribute to provide the failure mechanism of b2 rocks for evaluating the stability of reservoir slopes from the energy perspective.

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Dynamic mechanical behavior and fatigue damage evolution of sandstone under cyclic loading

Cited by 84 publications

References 29 publications

Experimental Study and Damage Model Study of Rock Salt Subjected to Cyclic Loading and Cyclic Creep

Experimental Study and Damage Model Study of Rock Salt Subjected to Cyclic Loading and Cyclic Creep

Experimental study on evolution in the characteristics of permeability, deformation, and energy of coal containing gas under triaxial cyclic loading‐unloading

Mechanical Characteristics and Energy Evolution Laws for Red Bed Rock of Badong Formation under Different Stress Paths

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