Experimental Investigation on the Fatigue Mechanical Properties of Intermittently Jointed Rock Models Under Cyclic Uniaxial Compression with Different Loading Parameters

Liu, Yi; Dai, Feng; Li, Dong; Xu, Nuwen; Peng, Feng

doi:10.1007/s00603-017-1327-7

Cited by 241 publications

(86 citation statements)

References 46 publications

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“…erefore, the area S 1 of the hysteresis loop (BCD or ABCDE) cannot be used to represent the dissipated energy. In addition to the energy dissipated in the area S 1 of the hysteresis loop, the energy in the area S 3 is also dissipated [29]. (2) For the cyclic loading test, the BC section is the loading section, the stress-strain curve shows an upward trend, the pressure head of the test machine performs positive work on the rock salt, and the area below the BC curve is the total energy U input to the rock salt by the pressure head of the test machine, i.e., area S 1 + S 2 + S 3 ; the CD section is the unloading section, the stress and strain are decreasing, and the rock salt releases energy outward.…”

Section: Energy Characteristicsmentioning

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: Energy Characteristicsmentioning

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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“…ere are many geotechnical constitutive models in FLAC3D software, the most widely used of which is the Mohr-Coulomb model. is model has two outstanding advantages: (a) this model is suitable for simulating loose or cemented granular materials; (b) this model is computationally efficient, which can save more memory and time; [30][31][32]. erefore, Mohr-Coulomb model is adopted for the side slope, and the corresponding slope parameters are the slope height H: 10 m, the slope ratio i: 1 : 1, the cohesion force c: 12.38 kPa, the internal friction angle φ: 20°, the density: 1800 kg/m − 3 , the shear modulus G: 10 GPa, and the bulk modulus K: 30 GPa.…”

Section: Case Verificationmentioning

confidence: 99%

Searching for Slip Surface of Disturbed Slope Based on Logistic Function

Zhu

Peng²,

Tan

et al. 2020

Shock and Vibration

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In the slope stability analysis, how to make the slip surface of the structure more precise and smoother has been the focus of research when fitting the slip surface with known numerical points. The study found that the logistic function has both advantages in fitting the slip surface. The related parameters (M, A, and K) are derived by the threshold, symmetry, and precision control of its function. Logistic function constructs the slip surface and compares it with the broken-line slip surface; the numerical results show that the slip points on the two slip surfaces are consistent, indicating that the logistic function fits the curve correctly; the logistic function smooths the original polyline curve, which facilitates solving the direction vector of the curve.

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“…It is recommended that the parameter b should be restricted in 1.0-1.2. The strain data were collected during the test and the damage D was calculated according to Equation (3). The damage cumulative curve can be fitted based on Equation (5).…”

Section: Inverted S-shaped Fatigue Damage Modelmentioning

confidence: 99%

“…The fatigue deformation and damage accumulation of rock and concrete are widely studied to reveal the mechanisms of fatigue failure and to evaluate the safety and stability of underground structures. Fatigue failure has become an important issue in the field of engineering research [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Fatigue Damage of Cracked Cement Paste after Grouting Enhancement

Wang

Guo

et al. 2018

Applied Sciences

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Grouting reinforcement is an important part of modern engineering and has grown in popularity due to the benefits of grouting enhancement on cyclic loading. Understanding the fatigue mechanism of grouting-enhanced structures is vital to the design and the long-term stability analysis of such structures. In this study, the fatigue mechanical properties of cracked cement paste after epoxy resin grouting enhancement under different cyclic conditions were investigated in the laboratory and an inverted S-shaped curve was proposed to describe the damage accumulation. The test results indicated that the fatigue axial deformation can be divided into three stages: the initial stage, constant velocity stage and accelerating stage. The irreversible deformation can be used to describe the damage accumulation. The fatigue process is significantly affected by the upper limit stress level and the stress amplitude. In addition, the exponential relationship between stress amplitude and fatigue life was obtained. The proposed S-shaped curve was validated by an experimental fatigue strain test.The tests result upon various load conditions and crack types represented a good agreement with the predicted data.

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Experimental Investigation on the Fatigue Mechanical Properties of Intermittently Jointed Rock Models Under Cyclic Uniaxial Compression with Different Loading Parameters

Cited by 241 publications

References 46 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

Searching for Slip Surface of Disturbed Slope Based on Logistic Function

Nonlinear Fatigue Damage of Cracked Cement Paste after Grouting Enhancement

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