Post-peak deformation and failure behaviour of Jinping marble under true triaxial stresses

Zheng, Zhenlong; Feng, Xia‐Ting; Yang, Chengxiang; Zhang, Xi-Wei; Li, Shaojun; Qiu, Shili

doi:10.1016/j.enggeo.2019.105444

Cited by 38 publications

(21 citation statements)

References 35 publications

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“…Jinping marble is a typical brittle rock, and its mechanical properties have been reported in many studies [31,[37][38][39][40][41][42][43]. In this study, the Jinping marble is used for parameter calibration, and a set of mechanical properties of Jinping marble, including uniaxial compressive strength (UCS), elastic modulus, Poisson's ratio, and tensile strength (TS), are matched with the simulated values [31,43].…”

Section: Calibration Of Micro-parametersmentioning

confidence: 99%

Study on Evolution Mechanism of Structure-Type Rockburst: Insights from Discrete Element Modeling

Zhang

et al. 2021

Sustainability

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Taking the “11.28” rockburst occurred in the Jinping II Hydropower Station as the engineering background, the evolution mechanism of structure-type rockburst was studied in detail based on the particle flow code. The results indicate that the failure mechanism of structure-type rockburst includes a tensile fracture induced by tangential compressive stress and a shear fracture caused by shear stress due to overburdened loadings and shear slip on the structural plane. In addition, it is found that the differences between structure-type rockburst and strainburst mainly include (a) the distribution of the local concentrated stress zone after excavation, (b) the evolution mechanism, and (c) the failure locations. Finally, the influence of four factors on the structure-type rockburst are explored. The results show that (1) when the friction coefficient is greater than 0.5, the effect of structural plane is weakened, and the rock near excavation tends to be intact, the structural-type rockburst intensity decreases; (2) the dissipated and radiated energy in structural-type rockburst reduces with rockmass heterogeneity m; (3) the lateral pressure coefficient has a significant effect on the intensity of deep rock failure, specifically in the form of the rapid growth in dissipative energy; (4) and the structural-type rockburst is more pronounced at a structural plane length near 90 mm.

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Section: Calibration Of Micro-parametersmentioning

confidence: 99%

Study on Evolution Mechanism of Structure-Type Rockburst: Insights from Discrete Element Modeling

Zhang

et al. 2021

Sustainability

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“…Currently, prismatic specimens are mainly used in true triaxial tests, and some research results have been obtained. The effects of σ 2 on the strength, deformation, and failure have been studied (Gao and Wang, 2021; Haimson and Chang, 2002; Mogi, 1971; Su et al., 2018, 2019, 2021; Zheng et al., 2019, 2020), and spalling, rockburst, and permeability tests have been investigated (Goodfellow et al., 2015; Li et al., 2018; Shi et al., 2017; Zhao and Cai, 2015; Zhao and He, 2017). These tests were also carried out on prismatic specimens at σ 2 = σ 3 .…”

Section: Introductionmentioning

confidence: 99%

“…These tests were also carried out on prismatic specimens at σ 2 = σ 3 . The description of the failure characteristics is the same as that at σ 2 > σ 3 ; that is, the fractures are parallel to σ 2 in the σ 1 - σ 3 plane, ignoring the stress states (Haimson and Chang, 2002; Mogi, 1971; Zheng et al., 2020). However, some numerical results show that fractures of prismatic specimens at σ 2 = σ 3 are not parallel to σ 2 (Cai, 2008; Pan et al., 2012; Xu and Cai, 2017).…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior and failure mechanisms of cylindrical and prismatic rock specimens under various confining stresses

Zheng

Jiang

et al. 2022

International Journal of Damage Mechanics

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Although cylindrical and prismatic specimens are often used in laboratory tests, the differences between their deformation and failure characteristics remain unclear. Cylindrical and prismatic specimens of two rocks (marble and granite) were analyzed under various conventional triaxial conditions. The failed prismatic specimens exhibit multiple fractures intersecting in the cross section. With increasing confining pressure, the failure mode of the prismatic specimen changes from tensile failure to shear failure. In the progressive failure process of prismatic specimens, the two lateral strains ε2 and ε3 are the same before the peak, but some differences arise after some degree of post-peak failure, where the acoustic emission (AE) activity clearly increases. The mechanical parameters (peak strength, internal friction angle, cohesion, Young's modulus, and Poisson's ratio) determined for the cylindrical and prismatic specimens are consistent. However, a significant difference in the fracture morphology exists among them, even with similar change trends in the tensile-shear failure mode with confining pressure.

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“…For example, the construction of Jinping II Hydropower Station includes several tunnels (such as headrace tunnel, auxiliary tunnel and drainage tunnel). Engineering geological data show that the above tunnel groups are all constructed in deep and high in-situ stress environments and the maximum principal stress is up to 69 MPa (Zheng et al., 2020). As for the underground infrastructure, the construction of deep-buried rock tunnel is very challenging.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior, mesoscopic properties and energy evolution of deeply buried marble during triaxial loading

Wang

et al. 2022

International Journal of Damage Mechanics

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A series of triaxial compression tests were conducted on deep-buried marble to reveal its deformation and failure characteristics along with the formation mechanism under high in-situ stress. The effects of confining pressure on the strength, deformation of marble samples were firstly analyzed. Then, the internal failure characteristics and energy evolution of the samples were comprehensively investigated based on the micro-CT scanning technology and energy balance theory. Results show that the strength and deformation at damage stress and peak stress points of marble samples increase with the increase of confining pressure. Micro-CT reconstructions reveal that the microcracks in the uniaxial compression sample are mainly tensile cracks and the failure exhibits obvious brittleness and splitting characteristics. The failure mode of triaxial compression samples gradually changes to shear failure with the increase of confining pressure. The number of cracks decreases first and then increases, and the damage is intensified around the main shear failure plane of samples under high confining pressure, resulting in a large number of conjugate secondary cracks. Further, with the increase of confining pressure, the strength increases linearly at energy hardening point, but increases nonlinearly at energy softening point. At the peak stress point, both total energy Utp and dissipated energy Udp increase in a concave function, while the elastic strain energy Uep and the circumferential strain energy U3p (negative direction) increase linearly. Besides, the damage evolution driven by energy can be roughly divided into hardening phase, energy storage phase, damage softening phase, and residual phase. These results can provide a useful reference for further understanding the failure mechanism of rock under high in-situ stress for disaster prevention.

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Post-peak deformation and failure behaviour of Jinping marble under true triaxial stresses

Cited by 38 publications

References 35 publications

Study on Evolution Mechanism of Structure-Type Rockburst: Insights from Discrete Element Modeling

Study on Evolution Mechanism of Structure-Type Rockburst: Insights from Discrete Element Modeling

Mechanical behavior and failure mechanisms of cylindrical and prismatic rock specimens under various confining stresses

Mechanical behavior, mesoscopic properties and energy evolution of deeply buried marble during triaxial loading

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