Test Study on Creep Character of Anchor Rod in Argillaceous Soft Rock

Fan, Qiu Yan; Liu, Cai Lin; Yang, Ke; Wang, Mei Qian

doi:10.4028/www.scientific.net/amr.396-398.565

Cited by 2 publications

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“…The rock creep mechanics test is the main method for studying the creep characteristics of rock under long-term loads. Because soft rock has significant creep characteristics, the creep characteristics of soft rock have been studied in the past (Fan et al, 2010;Li and Yang, 2018;Liu et al, 2020). At the same time, creep tests under more loading stress paths were carried out, and more rock creep results were obtained (Park et al, 2017;Li et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Research on creep characteristics of loading and unloading of hard Flint limestone

et al. 2023

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The hard Flint limestone of Shuibuya hydropower station underground construction cavern is utilized as a research object to investigate the creep problem caused by excavation of rock masses such as caverns. In order to perform a triaxial compression grade-unloading creep test, the actual adjustment path of stress during excavation of underground cavern surrounding rock is used. Limestone under different confistiff pressures is then evaluated. Based on the Nishihara model, the elastic damage element considering time-dependent damage is introduced, and the unloading creep constitutive model of stiff Flint limestone is established and verified by experiments. The results show: 1) Deformation and creep strain appear at all stress levels. 2) As the unloading amount increased from 2 to 4 MPa, the quasi-destructive stresses of the samples were smaller from 83 to 79 MPa, indicating that the unloading amount affected the final creep damage strength of the rock samples. In other words, the higher the unloading amount, the lower the ultimate creep failure strength. 3) When entering the accelerated creep stage, the axial and lateral creep strains of the sample increase non-linearly, and the rupture duration of the sample is very short. Therefore, the creep deformation and creep rate characteristics of this stage should be paid attention to in practical engineering. 4) Different from the loading stress path, the failure mode of the Flint limestone rock sample is different. When the unloading amount is 2 and 4 MPa, the creep failure mode of the Flint limestone rock sample is shear failure, showing a significant oblique section crack. 5) The non-linear creep model curve of aging damage and the fitting effect of the unloading creep test curve are acceptable. The rationality of the established non-linear creep model is illustrated.

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Section: Introductionmentioning

confidence: 99%

Research on creep characteristics of loading and unloading of hard Flint limestone

et al. 2023

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“…Miao et al [17] established the evolution equation and the general damage theory of frozen soil creep on the basis of the study on the creep test and its microstructure observation to depict the strengthening and weakening effects in the process of creep. However, many investigators just considered the weakening effect but lost sight of the strengthening effect when they formulated the creep models, but it is necessary to consider both the strengthening effect [18][19][20] and the weakening effect in the creep process according to the electron microscope scanning results of hardening and damage of sketch by Fan et al [21] as shown in Figure 1. Therefore, in this paper, firstly, through the triaxial creep tests of the frozen silty clay mixed with sands, the strengthening and weakening effects in the process of creep are revealed.…”

Section: Introductionmentioning

confidence: 99%

A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening Effects

Feng¹,

Quan-ming²,

Liu

et al. 2016

Advances in Materials Science and Engineering

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The triaxial creep tests of frozen silty clay mixed with sands were performed under different pressures, and the test results demonstrated that, under the low confining pressure, when the shear stress is lower than the long-term strength, the test specimen exhibits an attenuation creep because the strengthening effect is greater than the weakening effect. When the shear stress is higher than the long-term strength, the test specimen exhibits a nonattenuation creep due to the level of the strengthening and weakening effects change in different stages. As the confining pressure increases, the test specimens only exhibit an attenuation creep because of the enhancing strengthening effect. Both the hardening parameter and the damage variable were introduced to describe the strengthening and weakening effects, respectively, and a new creep constitutive model for frozen soil considering these effects was put forward based on the theory of elastoviscoplastic and the fractional derivative. Finally, the model parameters were analyzed and their determination method was also provided to reveal the trend of parameters according to the triaxial test results. The calculated results of the constitutive model show that the proposed model can describe the whole creep process of frozen soil well.

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Test Study on Creep Character of Anchor Rod in Argillaceous Soft Rock

Cited by 2 publications

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Research on creep characteristics of loading and unloading of hard Flint limestone

Research on creep characteristics of loading and unloading of hard Flint limestone

A Fractional Creep Constitutive Model for Frozen Soil in Consideration of the Strengthening and Weakening Effects

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