Brittle and ductile creep behavior of Jinping marble under true triaxial stress

Zhao, Jun; Feng, Xia‐Ting; Zhang, Xiwei; Yang, Chengxiang

doi:10.1016/j.enggeo.2019.105157

Cited by 46 publications

(12 citation statements)

References 26 publications

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“…This detection method observes mainly the microstructure of the rock surface before and after the experiments but cannot observe the damage of the rock during creep in real time. At present, SEM has been widely used to investigate rock creep damage 4,18,73,80,111–113 . The morphology of the fractured cross section of the rock after the creep experiment was observed, and then the morphological characteristics of the rock before the experiment were compared to analyze the damage caused by the creep.…”

Section: Study Methods and Results Of Creep Experimentsmentioning

confidence: 99%

“…He believed that the increase in confining pressure may lead to the reduction of cracks in rocks and may arrest the evolution of damage. Zhao et al carried out six brittle creep experiments and two ductile creep experiments on marble under true triaxial stress conditions (

σ_{1} > σ_{2} \geq σ_{3}

) 111 . The creep deformation of the rock decreases as the intermediate principal stress increases.…”

Section: Study Methods and Results Of Creep Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

A state‐of‐the‐art review on creep damage mechanics of rocks

Zhou

Pan

Berto

2022

Fatigue Fract Eng Mat Struct

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In many major rock projects, services have spanned decades or even hundreds of years. For engineering design, it is necessary not only to ensure the safety of personnel during construction but also to ensure the safety of long‐term use and operation in the future. Therefore, it is indispensable to study the creep damage mechanical properties of rocks before the construction of the project. For a long time, rock creep has been an important reason for large deformation and even instability in building foundations, underground tunnels, and slopes. Moreover, the surrounding rock generally exhibits obvious creep damage characteristics under an environment of high stress, high temperature, and high water‐pressure. Under certain geological conditions, this creep damage behavior is extremely prominent. Therefore, the study of rock creep damage mechanics is very important. This paper reviews the advancement of rock creep damage mechanics from the aspects of mechanisms, research methods, constitutive models, and so forth. Rock creep is a process of interaction between structural damage and the hardening effect. The structural damage and hardening effect are opposite to each other, but they exist in the same physical process. The creep research method introduces mainly the research objects, influencing factors, monitoring methods, and experimental methods. Creep constitutive models introduce mainly empirical models, linear element combination models, nonlinear combination models, and other nonlinear models based on new theory. Finally, based on the current research progress, several important research directions in rock creep damage mechanics are pointed out.

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Section: Study Methods and Results Of Creep Experimentsmentioning

confidence: 99%

σ_{1} > σ_{2} \geq σ_{3}

) 111 . The creep deformation of the rock decreases as the intermediate principal stress increases.…”

Section: Study Methods and Results Of Creep Experimentsmentioning

confidence: 99%

A state‐of‐the‐art review on creep damage mechanics of rocks

Zhou

Pan

Berto

2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Willis et al (2021) indicated that earthquakes imposed changes of mantle rock stress and commonly induce a period of creep. Time-dependent behaviors for undergrounding rock, caused by excavation and changes in the applied stress, affect the distribution and magnitude of disasters, e.g., rockburst (Feng et al, 2017;Zhao et al, 2019). Delay outburst of coal and gas in mining commonly occurs a few hours lag after mining blasting, which related with time-dependent properties of coal (Lu and Zhao, 2016).…”

Section: Introductionmentioning

confidence: 99%

Generalized Relaxation Behavior of Rock Under Various Loading Conditions Using a Constant Linear Combination of Stress and Strain

et al. 2021

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Time-dependent behavior has been demonstrated to be an essential factor in determining the long-term stability of underground structures. Creep and relaxation experiments are commonly used to investigate time-dependent behavior by subjecting rock to constant stress and strain. However, both stress and strain of in-situ rock masses are likely to change with time, a phenomenon known as generalized relaxation that has not been thoroughly investigated. In this study, a newly proposed control method with a constant linear combination of stress and strain as a feedback signal is used in compression and tension tests to investigate generalized relaxation behaviors of rocks. The results showed that the stress and strain of generalized relaxation are dependent on values of α, which represented generalized relaxation direction. The isochronous curves are enclosed within stress–strain curves of different loading conditions. The variation of stress (∆σ) and strain (∆ε) increases with increasing stress level and decreases with increasing confining pressure. Also, ∆σ and ∆ε in region II are smaller than in regions I and III. Furthermore, by performing brittle rock tests, complete generalized relaxation curves are obtained; three stages are observed, which are similar to conventional creep and relaxation behavior. Finally, the time and generalized relaxation failure behavior of Class I and Class II rock are discussed. The study is a valuable resource for gaining a comprehensive understanding of the time-dependent behavior of rocks and improving the stability and safety of underground structures.

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“…In the process of ductile creep, the microcrack growth with time is also one of the main reasons for the failure of hard rock. In the process of brittle and ductile creep, rock samples show different time-dependent crack growth patterns in the microcosmic mechanism, leading to significant differences in macroscopic deformation behavior [12,13]. A series of uniaxial compressive strength tests and multistage creep tests are carried out on rock specimens under different immersion conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on the Allowable Exposure Time of Temporary Goaf in the Open Stope and Backfill Mining Method with Large Structure Parameters

Liu

Wang

Luo

et al. 2020

Advances in Civil Engineering

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Based on the uniaxial rheological experiment data of iron ore rock mass and filling body in large-scale stope obtained by using the rock servo controlling creep equipment, the characteristics of the creep curve were analyzed. The creep models of iron ore and filling body which can show the attenuation creep of rock were constructed. And a nonlinear creep model was obtained. According to the rheological data of the iron ore and the filling body, the parameters of the new nonlinear creep model were identified to obtain the material parameters of the creep model. Then, the creep model parameters were fitted and reduced to calculate the reasonable exposure time of temporary goaf in the large-scale stope. The results show that the reasonable exposure time of stope is 520 ～ 650 days, and the reasonable exposure time of filling body is 410 ～ 520 days. The model can well describe the initial attenuation creep stage and steady creep stage in the creep curve, which proves the correctness and rationality of the model. The study provides a reference for mining design and safety production of similar mines with large-scale stope structure.

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Brittle and ductile creep behavior of Jinping marble under true triaxial stress

Cited by 46 publications

References 26 publications

A state‐of‐the‐art review on creep damage mechanics of rocks

A state‐of‐the‐art review on creep damage mechanics of rocks

Generalized Relaxation Behavior of Rock Under Various Loading Conditions Using a Constant Linear Combination of Stress and Strain

Study on the Allowable Exposure Time of Temporary Goaf in the Open Stope and Backfill Mining Method with Large Structure Parameters

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