The double Burgers model of fractured rock masses considering creep fracture damage

Zhao, Yanlin; Liu, Qiang; Tang, Liming; Xie, Shengrong

doi:10.21595/jve.2019.20304

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…Li et al [8] introduced damage variables into constitutive relations and creep equations based on Kachanov's creep damage theory to describe the creep process in a fissured rock body and derived an equation for the evolution of the damage variables over time during the creep process. Zhao [9] established an equivalent Burgers model for creep fracture in a fissured rock body by introducing equivalent stresses and proposed a double Burgers model, which was used in the creep test. Li et al [10] carried out creep mechanics testing on saturated frozen Cretaceous sandstone under different peripheral pressure conditions, drew on classical modeling ideas based on a Riemann-Liouville-type integral function to establish a five-element nonlinear creep damage constitutive equation considering low temperature-damage-stress coupling, and carried out validation of the model.…”

Section: Introductionmentioning

confidence: 99%

Simulation analysis of the evolution law of creep rupture crack extension in X-fractured rock body

zhao,

wei,

sun

et al. 2024

Preprint

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Creep is the macroscopic manifestation of the process of generation, expansion, and penetration of microscopic cracks in a rock body. In this study, the GDEM continuous–discontinuous numerical simulation software was used to model a rock body containing X-type fissures for the purposes of exploring creep crack expansion and rupture in the rock body, analyzing the effects of various factors on X-type fissures in the rock body under the rule of change of the creep curve, and assessing the influences of the intersection angle of the fissure and other factors on the non-parallel fissure rock body on the creep rupture process. The results show that an X-type fissure rock body exhibits a mixed tensile–shear damage mode, with tensile damage being the main type of damage. In the isotropic creep stage of a rock body with X-type fissures, the steady-state creep rate initially increases and then decreases as the sub-fissure length increases, with the change of the fissure angle of the creep rate of the w-type; the sub-fissure length of h is 14mm, the rock body is the first to enter into the accelerated creep stage, for the different fissure intersection angle of the rock body For the rock mass with different fracture angles, the time sequence of entering the accelerated creep stage is consistent with the creep rate; when the fracture intersection angle is 45°, and the sub-fracture length is 12mm, the rock mass has the largest degree of fragmentation, which has a significant impact on the creep damage; after using a single variable processing, it is found that the fracture intersection angle, the sub-fracture length and other factors compared to the fracture intersection angle has a greater impact on the creep damage of the X-type fissure rock mass. This paper can provide theoretical basis and reference for the study of rock engineering creep damage law and mechanical properties of X-type rift rock body.

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Section: Introductionmentioning

confidence: 99%

Simulation analysis of the evolution law of creep rupture crack extension in X-fractured rock body

zhao,

wei,

sun

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Li et al 10 introduced damage variables into constitutive relations and creep equations based on Kachanov’s creep damage theory to describe the creep process in a fractured rock body and derived an equation for the evolution of the damage variables over time during the creep process. Zhao 11 established an equivalent Burgers model for creep fracture in a fractured rock body by introducing equivalent stresses and proposed a double Burgers model, which was used in the creep test. Li et al 12 .…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al 13 proposed a transient creep model based on mesoscale damage intrinsic structure to numerically simulate the transient creep of inhomogeneous sandstone, and compared with the test results to validate the creep model. Zhao et al 11 established an equivalent Burgers model for creep fracture offracture rock by introducing isostress, and proposed a dual Burgers model to study the creep behavior of fractured rock, and the proposed dual Burgers model was embedded into FLAC3D using the Fish function. In addition, the proposed dual Burgers model was embedded in FLAC3D using the Fish function.…”

Section: Introductionmentioning

confidence: 99%

Simulation analysis of the evolution law of creep rupture crack extension in X-fractured rock body

Zhao,

Wei,

Wang

et al. 2024

Sci Rep

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Creep is the macroscopic manifestation of the process of generation, expansion, and penetration of microscopic cracks in a rock body. In this study, the GDEM continuous–discontinuous numerical simulation software was used to model a rock body containing X-fractured for the purposes of exploring creep crack expansion and rupture in the rock body, analyzing the effects of various factors on X-fractured the rock body under the rule of change of the creep curve, and assessing the influences of the intersection angle of the fracture and other factors on the non-parallel fractured rock body on the creep rupture process. The results show that an X-fractured rock body exhibits a mixed tensile–shear damage mode, with tensile damage being the main type of damage. In the isotropic creep stage of a rock body with X-fractured , the steady-state creep rate initially increases and then decreases as the sub- fracture length increases, with the change of the fracture angle of the creep rate of the w-type; the sub-fracture length of h is 14 mm, the rock body is the first to enter into the accelerated creep stage, for the different fracture intersection angle of the rock body For the rock mass with different fracture angles, the time sequence of entering the accelerated creep stage is consistent with the creep rate; when the fracture intersection angle is 45°, and the sub-fracture length is 12 mm, the rock mass has the largest degree of fragmentation, which has a significant impact on the creep damage; after using a single variable processing, it is found that the fracture intersection angle, the sub-fracture length and other factors compared to the fracture intersection angle has a greater impact on the creep damage of the X-fractured rock body. This paper can provide theoretical basis and reference for the study of rock engineering creep damage law and mechanical properties of X-fractured rock body.

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“…The above four types of models are applicable to different working conditions and stress states. For instance, the Burgers creep model [26][27][28], which belongs to the element model, is more appropriate for describing the shear creep curve of the soil before the third stage and has been widely used. An improved Burgers model involving the stress-suction-strain-time model was established by Chang et al by connecting the nonlinear dashpot on the Burgers model [29].…”

Section: Introductionmentioning

confidence: 99%

Creep Characteristics of Soil in the Sliding Zone of Huangtupo Landslide

et al. 2022

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The reservoir water level in the Three Gorges Reservoir (TGR) of the Yangtze River is adjusted between 145 m and 175 m throughout the year. The landslide below the reservoir water level bears periodic dynamic seepage pressure on the basis of the original steady-state water pressure. In the process of rising reservoir water levels in particular, the effective stress on the sliding zone soil below the reservoir water level line is reduced, and the sliding zone soil shows an unloading state. In order to study the creep characteristics of landslides in a reservoir area, direct shear creep tests of the sliding zone soil in the Huangtupo landslide in an unloading state were carried out in this study. The test results show that the creep characteristics of the sliding zone soil are obvious. The creep curve of the sliding zone soil presents an attenuation creep stage with low shear stress, which is mainly manifested as an elastic creep. However, with the increase in the shear stress, the creep curve of the sliding zone soil presents a steady creep stage, which is mainly manifested as viscoelastic creep. The nonlinear creep characteristics of the sliding zone soil are related to the creep time, stress level, and soil porosity. The longer the creep time, the greater the stress level and the denser the soil, the more obvious the nonlinear creep characteristics of the sliding zone soil. In this study, the Burgers model was used to fit the creep curve of the sliding zone soil, and the fitting effect was good, which indicates that the Burgers model can sufficiently describe the unloading state creep characteristics of the sliding zone soil in the Huangtupo landslide.

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The double Burgers model of fractured rock masses considering creep fracture damage

Cited by 8 publications

References 24 publications

Simulation analysis of the evolution law of creep rupture crack extension in X-fractured rock body

Simulation analysis of the evolution law of creep rupture crack extension in X-fractured rock body

Simulation analysis of the evolution law of creep rupture crack extension in X-fractured rock body

Creep Characteristics of Soil in the Sliding Zone of Huangtupo Landslide

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