Mudstone creep experiment and nonlinear damage model study under cyclic disturbance load

Wang, Junguang; Sun, Qinglin; Li, Bing; Yang, Ping; Qing-rong, YU

doi:10.1038/s41598-020-66245-w

Cited by 23 publications

(17 citation statements)

References 10 publications

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“…Scholars have achieved fruitful advancements in studying rock creep models, which are mainly categorized into empirical and component combination models 4 – 6 . Empirical models are based on experimental phenomena and laws 7 – 10 ; component combination models are based on essential components, such as elasticity, viscosity, and plasticity, and are formed by series and parallel methods 11 , 12 . Wang et al 13 established a six-element composite creep model by analyzing the loading and unloading creep curves of limestone.…”

Section: Introductionmentioning

confidence: 99%

Creep damage model of rock with varying-parameter under the step loading and unloading conditions

Wang

et al. 2021

Sci Rep

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The creep characteristics of rock under step loading and unloading conditions were investigated in this study. Based on the generalized Burgers model, the total strain of rock was decomposed into elastic, viscoelastic, varying-parameter viscoelastic, and viscoplastic strains considering the damage. The four strains were connected in series to establish a new varying-parameter creep damage model that can characterize the creep characteristics of rock under step loading and unloading conditions as well as identify and verify the model parameters. The study results showed that the varying-parameter creep damage model could better describe the creep characteristics of rock under step loading and unloading conditions, significantly the non-linear both the strain and time of attenuation creep and accelerated creep. The model fitting curve was highly consistent with the experimental data, and the correlation coefficient R2 was greater than 0.98, which thoroughly verified the accuracy and rationality of the model. These findings can provide theoretical support for analyzing the deformation and long-term stability of rock and soil.

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Section: Introductionmentioning

confidence: 99%

Creep damage model of rock with varying-parameter under the step loading and unloading conditions

Wang

et al. 2021

Sci Rep

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“…Then, applying Burger's model into DEM, Li et al [14] studied the rheological behavior of soft rock; Guo et al [15] studied the time-dependent mechanics of sandstone. However, many creep tests of soft rock [14,[16][17][18][19][20] have shown that the full creep includes attenuated, steady, and accelerated creep. The classic Burger's model can only reveal the first two creep stages [21], which is weak in describing the damage process.…”

Section: Introductionmentioning

confidence: 99%

Burger’s Bonded Model for Distinct Element Simulation of the Multi-Factor Full Creep Process of Soft Rock

Xia

Liu

Zhou

2021

JMSE

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Pervasive, unavoidable and uncontrollable creep failure generated in soft-rock engineering occasionally happens and therefore attracts extensive attention recently. However, due to soft rock’s multi-factor creep mechanism, it is still difficult to simulate the full-stage creep with the Distinct Element Method (DEM). In this study, we proposed an improved simulation method based on the classical Burger’s model and the Parallel Bonded model in Particle Flow Code (PFC). We apply the abovementioned models together to simulate the full-stage creep process in soft rock. The proposed process has considered the mesoscopic mechanical characteristics of DEM carefully and finally resulted in a parallel physical model, which is called Burger’s Bonded model in this paper. The DEM simulation test using Burger’s Bonded model was designed to compare with experiments. The experiments include a normal creep test and a uniaxial loading test with prefabricated cracks. In contrast to experimental results, the numerical results show that the average error during the whole creep process is less than 3%; the stress–strain curves and crack development process show great agreement. It is also found that the wing crack coalescence in soft rock is independent of the prefabricated crack angle, propagating with a fixed dip angle. The results show that the numerical method proposed in this paper can simulate the multi-factor-caused full stage (attenuated, steady, accelerated) creep process of soft rock in DEM, which provides new insights for theoretical research and engineering design.

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“…rough qualitative analysis, the types of creep disturbance failure were classified into two types. Wang et al [24,25] carried out creep disturbance experiments with different perturbation amplitudes and frequencies on different soft rock specimens (gneiss and mudstone) using a stepwise loading method, and according to the disturbance creep characteristics, a creep perturbation damage model was established.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Creep Disturbance Effect and Acoustic Emission Characteristics of Mudstone with Different Moisture Contents

Wang

Zhang

et al. 2021

Shock and Vibration

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It is important to have a clear understanding of the creep characteristics of water-rich soft rocks under a dynamic load and the evolution of cracks because soft rock roadways in deep mines are very sensitive to disturbances, and instability and damage can easily occur under the impact of disturbances such as mining and blasting. In this study, a self-developed disturbed creep test bench was used to conduct graded loading creep disturbance tests on mudstone specimens with different moisture contents. The results show that an increase in the moisture content leads to a significant increase in the creep failure strain of mudstone, and the accelerated creep rate is greatly accelerated. Moreover, as the moisture content increases, the type of mudstone creep disturbance failure gradually changes from accelerated creep failure to disturbance failure. By analyzing the acoustic emission (AE) characteristics of the mudstone creep disturbance tests, it was found that the increase in the moisture content greatly weakens the AE count and the accumulated energy. In each stage of disturbance, the AE signals jumped, and the stability was restored at the end of the disturbance. As the load increased, the specimen entered the accelerated creep stage, the AE signal increased exponentially, and the internal cracks expanded rapidly until failure occurred. It is of great significance to carry out creep disturbance experiments and to analyze the evolution of the internal cracks in specimens with different moisture contents to maintain the long-term stability of deep soft rocks.

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Mudstone creep experiment and nonlinear damage model study under cyclic disturbance load

Cited by 23 publications

References 10 publications

Creep damage model of rock with varying-parameter under the step loading and unloading conditions

Creep damage model of rock with varying-parameter under the step loading and unloading conditions

Burger’s Bonded Model for Distinct Element Simulation of the Multi-Factor Full Creep Process of Soft Rock

Experimental Study of the Creep Disturbance Effect and Acoustic Emission Characteristics of Mudstone with Different Moisture Contents

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