Creep Properties and Constitutive Model of Salt Rock

Zhang, Qiang; Song, Zhanping; Wang, Junbao; Zhang, Yuwei; Wang, Tong

doi:10.1155/2021/8867673

Cited by 6 publications

(4 citation statements)

References 108 publications

(132 reference statements)

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“…The long-term prestress loss of anchor cable is mainly determined by the material properties of anchor cable itself and the mechanical properties of rock mass, therefore, the calculation model of prestress loss of anchor cable is generally established by reasonably combining the calculation model of anchor cable and rock mass [22][23][24][25], as we all know, the premise of establishing the coupled creep model is to assume that the rock mass is uniformly stressed [19,26], from the previous analysis, it can be seen that the frame beam is the guarantee of the uniform stress of the rock mass, and the actual stress of the rock mass under the action of the frame beam can be closer to the assumed condition, Therefore, the role of frame beam should not be ignored in the establishment of prestress loss model of anchor cable.…”

Section: Prestress Loss Model Of Anchor Cable Considering the Action Of Frame Beammentioning

confidence: 99%

Analysis of Re-Tensioning Time of Anchor Cable Based on New Prestress Loss Model

Shi

Tian

et al. 2021

Mathematics

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Considering the interaction among anchor cable, frame beam and rock mass, a new model of prestress loss of anchor cable was established. The accuracy and applicability of the new model were verified by comparing the field monitoring data and the calculation results of existing models. In addition, based on the new model, the effect of the re-tension of the anchor cable at different time nodes was analyzed, and the later compensation time of anchor cable prestress was discussed. The research shows that: the accuracy of the new model is higher after considering the effect of the frame beam, the new model can not only calculate the loss of prestress of anchor cable, but also accurately predict the time when the prestress of anchor cable reaches the stable stage. The ideal effect of prestress compensation can be achieved when the anchor cable is re-tensioned at each time point after 20 days of the construction completed. The original prestress loss of the anchor cable is different, and the re-tension effect is also different, the greater the loss of the original prestress of the anchor cable, the more obvious the prestress compensation effect during the re-tension.

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Section: Prestress Loss Model Of Anchor Cable Considering the Action Of Frame Beammentioning

confidence: 99%

Analysis of Re-Tensioning Time of Anchor Cable Based on New Prestress Loss Model

Shi

Tian

et al. 2021

Mathematics

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“…e rheological effect of rock is obvious in slope, tunnel, roadway, and other projects, which is a very important feature of rock materials [8][9][10][11][12][13]. A large number of engineering practices show that the long-term stability of a project is closely related to the rheological properties of rock [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Viscoelastic-Plastic Creep Model of Rock Based on Fractional Calculus

Wei

et al. 2022

Advances in Civil Engineering

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A rock creep constitutive model is the core content of rock rheological mechanics theory and is of great significance for studying the long-term stability of engineering. Most of the creep models constructed in previous studies have complex types and many parameters. Based on fractional calculus theory, this paper explores the creep curve characteristics of the creep elements with the fractional order change, constructs a nonlinear viscoelastic-plastic creep model of rock based on fractional calculus, and deduces the creep constitutive equation. By using a user-defined function fitting tool of the Origin software and the Levenberg–Marquardt optimization algorithm, the creep test data are fitted and compared. The fitting curve is in good agreement with the experimental data, which shows the rationality and applicability of the proposed nonlinear viscoelastic-plastic creep model. Through sensitivity analysis of the fractional order β2 and viscoelastic coefficient ξ2, the influence of these creep parameters on rock creep is clarified. The research results show that the nonlinear viscoelastic-plastic creep model of rock based on fractional calculus constructed in this paper can well describe the creep characteristics of rock, and this model has certain theoretical significance and engineering application value for long-term engineering stability research.

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“…Zhang et al [ 13 ] studied the coupling effect of triaxial stress and gas pressure on coal, considered effective stress in the Nishihara model, and conducted an in-depth analysis of the creep stage of coal and rock. Numerous scholars from teams such as Liu et al [ 14 ], Lin et al [ 15 ], Wu et al [ 16 ], Gutiérrez-Ch et al [ 17 ], Lyu et al [ 18 ], and Zhang et al [ 19 ] have made more research results on uniaxial and triaxial compression creep in soft rocks such as tuffs, shales, siltstones, salts, weathered sandstones, and coal bodies.…”

Section: Introductionmentioning

confidence: 99%

Research on the Creep Model of Deep Coal Roadway and Its Numerical Simulation Reproduction

Zhang

Wang

Ding

2022

IJERPH

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The long-term stability of coal mine roadway engineering is critical to the safe mining of coal resources and the protection of the surface environment. In this paper, the creep test of coal samples in coal roadway was carried out by multi-stage constant load method, and the test results showed that when the stress level was low, the creep curve had a attenuated stage and a steady-state stage, and the steady-state creep rate tended to increase with the increase in the stress level; When the stress level was higher than the yield stress, the creep rate curve appeared to have an acceleration stage after the steady-state stage. The instability failure mode of the coal sample was mainly shear failure with local tension failure. For this, a New Fractional-order Nonlinear Viscoelastic-plastic Rheological Model (NFNVRM) was established by introducing Abel elements and Nonlinear elements, and the constitutive equation of the model was deduced. The new model can fully reflect the stable decay stage and accelerated rheological stages of coal samples, and the parameter identification curve was consistent with the experimental results, which verifies the correctness and reasonableness of the NFNVRM. Meanwhile, based on the FLAC3D secondary development interface, the constitutive equations of the NFNVRM were written into the software to obtain new Dynamic Link Library (DLL) files. The simulation results were consistent with the experimental results when the DLL file was called. Finally, the NFNVRM.dll was applied to predict the surrounding rock deformation of an S mine. The study’s findings offer suggestions for environmental protection.

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Creep Properties and Constitutive Model of Salt Rock

Cited by 6 publications

References 108 publications

Analysis of Re-Tensioning Time of Anchor Cable Based on New Prestress Loss Model

Analysis of Re-Tensioning Time of Anchor Cable Based on New Prestress Loss Model

Nonlinear Viscoelastic-Plastic Creep Model of Rock Based on Fractional Calculus

Research on the Creep Model of Deep Coal Roadway and Its Numerical Simulation Reproduction

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