Hydro-mechanical coupling characteristics and damage constitutive model of low-permeability granite under triaxial compression

Zheng, Zhenlong; Xu, Hongyu; Wang, Wei; Mei, Guoxiong; Liu, Zaobao; Zheng, Hong; Huang, Shuling

doi:10.1177/10567895221132868

Cited by 8 publications

(4 citation statements)

References 56 publications

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“…According to Figure 9, it can be found that the limitation of the permeability of rock samples by the pressure was quite critical. Zheng et al [38] suggested that this is because the confining pressure acts to consolidate the pore and fissure pressures within the rock sample. It should be noted that the four parts, I, II, III, and IV, divided in Figure 10 correspond to the crack closure stage (I), linear elasticity stage (II), stable crack expansion stage (III), and unstable crack expansion stage (IV), respectively.…”

Section: Analysis Of Seepage Evolutionmentioning

confidence: 99%

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Experimental Study on the Pre-Peak Mechanical and Seepage Characteristics of Granite

Zeng,

Lin,

Chen

et al. 2024

Applied Sciences

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The Sanshandao Gold Mine is currently in the deep mining stage. The ground pressure on the surrounding rocks is gradually becoming more considerable, and at the same time, threatened by the overlying seawater, the possibility of mine water inrush accidents is increasing. In this study, the MTS815 rock triaxial seepage test system was employed for the triaxial compression testing and stress–seepage coupled testing of granite under different confining pressures. The results show that granite’s pre-peak mechanical evolution under different confining pressures is divided into four stages (the crack closure stage, linear elasticity stage, stable crack expansion stage, and unstable crack expansion stage). With the increase in the confining pressure, the crack initiation threshold, crack damage threshold, and peak threshold gradually increased, but the closure threshold had no corresponding change. Moreover, in the loading process, the permeability curve first decreased and then increased, and the confining pressure suppressed the peak permeability of granite. Finally, based on the test results, stress sensitivity analysis was carried out, and it was found that polynomials fit the relationship between permeability and effective stress better. Granite’s permeability showed strong stress sensitivity at medium confining pressures. The stress sensitivity of the permeability of granite decreased with increasing effective stress at medium and high confining pressures, while it tended to increase at low confining pressures.

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Section: Analysis Of Seepage Evolutionmentioning

confidence: 99%

Section: Analysis Of Seepage Evolutionmentioning

confidence: 99%

Experimental Study on the Pre-Peak Mechanical and Seepage Characteristics of Granite

Zeng,

Lin,

Chen

et al. 2024

Applied Sciences

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show abstract

“…Based on these strength criteria, the corresponding perfect elastoplastic model is established, which can reflect the linear elastic deformation characteristics and strength characteristics of rock but cannot describe the pre-peak plastic hardening behaviour of rock. Some scholars proposed models to reflect the pre-peak hardening nonlinear behaviour of rock based on elastoplastic theory (Feng and Liu, 1996; Makhnenko and Labuz, 2015; Siddiquee and Hamdi, 2019; Wang et al., 2018, 2020; Xu, 2021; Zheng et al., 2022d). To characterize the post-peak softening of rock, some scholars have systematically studied mechanical behaviour of rock using macroscopic and microscopic mechanics and established some elastoplastic damage constitutive models (Bikong et al., 2015; Feng et al., 2004; Feng and Yu, 2010; Ju, 1989, 1990; Kim and Lee, 2011; Qu, 2021; Shao and Rudnicki, 2000; Wang and Ma, 2022; Zhang, 2022; Zhao et al., 2018; Zheng et al., 2022c).…”

Section: Introductionmentioning

confidence: 99%

A thermodynamic damage model for 3D stress-induced mechanical characteristics and brittle–ductile transition of rock

Zheng

Mei

et al. 2023

International Journal of Damage Mechanics

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Due to the existence of true three-dimensional high-geostress in deep underground engineering, rock shows different mechanical properties and brittle–ductile behaviours from conventional triaxial stress states, however, the different characteristics of rock are not clear. Therefore, a series of true triaxial tests were performed on deeply buried marble to investigate the effects of σ2 and σ3 on the characteristic strength (peak strength, yield strength and residual strength), post-peak deformation and brittle–ductile behaviour. Based on test results, a three-dimensional elastoplastic damage constitutive model that describes plastic hardening and damage softening of rock was established within the framework of irreversible thermodynamics, and a sensitivity analysis of key parameters ( η and ζ) was performed. A method that controls the brittle–ductile behaviour of rock through key parameters η and ζ was studied, and functions of these two parameters with σ2 and σ3 were proposed. The proposed model was implemented numerically with the cutting-plane algorithm in a finite element program. A series of numerical simulation experiments were performed, and numerical simulation and experimental results are consistent. In addition, brittle–ductile transition of marble under untested true triaxial stress levels were reasonably predicted.

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“…At the same time, researchers connected statistical theory, damage theory and continuum mechanics (Jiang et al., 2022; Krajcinovic and Silva, 1982; Liu and Zhang, 2015; Song et al., 2022; Weibull, 1951; Xie and Gao, 2000), which promoted the development of rock constitutive models. Scholars have used functions such as normal distribution, log-normal distribution and Weibull distribution to characterize microunit features (Chen et al., 2018, 2021; Ji et al., 2019; Zheng et al., 2022d). In addition, with the development of modern information theory, the use of entropy to fit the microscopic properties of rocks has also achieved good results (Deng and Gu, 2011; Deng and Pandey, 2009).…”

Section: Introductionmentioning

confidence: 99%

A new statistical damage model for true triaxial pre-and post-peak behaviors of rock considering intermediate principal stress and initial compaction effects

Zheng

et al. 2022

International Journal of Damage Mechanics

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Deep underground engineering excavation will induce complex change in the true three-dimensional stress state of the surrounding rock, causing rock damage and then leading to a change in mechanical properties. In this research, the true triaxial compression tests are conducted to study the influence of σ2 and σ3 on the mechanical properties of marble, such as the characteristic strength (crack initiation stress σci, damage stress σcd, peak strength σp, and residual strength σr), post-peak deformation, ductility and brittleness. The peak strength σp, crack initiation stress σci and damage stress σcd of rock increase with the increase in σ2, while the variation of residual strength σr with σ2 is different from that of peak strength. As σ2 increases or σ3 decreases, the pre-peak plasticity of the rock decreases, the post-peak curve shape of the rock changes significantly, and the overall shape of the post-peak curve transforms from Class I to Class II. The Mogi-Coulomb strength criterion with intermediate principal stress effect was used to characterize the rock microelement strength, and then the new statistical damage constitutive model considering the initial compaction effect and damage threshold was proposed, and the model validation was carried out based on the experimental results and the effects of the proposed model parameters m and F0 on the rock strength and post-peak curve morphology were further explored.

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Hydro-mechanical coupling characteristics and damage constitutive model of low-permeability granite under triaxial compression

Cited by 8 publications

References 56 publications

Experimental Study on the Pre-Peak Mechanical and Seepage Characteristics of Granite

Experimental Study on the Pre-Peak Mechanical and Seepage Characteristics of Granite

A thermodynamic damage model for 3D stress-induced mechanical characteristics and brittle–ductile transition of rock

A new statistical damage model for true triaxial pre-and post-peak behaviors of rock considering intermediate principal stress and initial compaction effects

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