Damane evolution law based on acoustic emission and weibull distribution of granite under uniaxial stress

Ji, Ming

doi:10.13168/agg.2014.0006

Cited by 22 publications

(11 citation statements)

References 24 publications

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“…Rock mechanics studies have been extensively conducted in China and abroad, which cover a broad range, from uniaxial to triaxial compression, simple to multiple conditions, and single to complex paths [1][2][3][4][5][6]. In triaxial tests, the initial stress level mainly includes the initial confining pressure and the initial axial pressure.…”

Section: Introductionmentioning

confidence: 99%

Elastic-Plastic Threshold and Rational Unloading Level of Rocks

Guo

2019

Applied Sciences

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During loading and unloading test, various rocks manifest different stress values of elastic-plastic transformation. This study proposes to include axial pressure increment ratio in the conventional triaxial compression test to evaluate different variables (nominal elastic modulus, nominal Poisson's ratio, strain, and energy). The relationships among various factors including variables, the stress level of initial confining stress and axial pressures, were analyzed by analyzing the stress-strain plot record obtained from testing various rocks. The extreme value point of the deformation parameter, also known as the elastic-plastic threshold, was analyzed. In addition, the elastic-plastic thresholds were later used as unloading points during the unloading tests. Under the same confining condition, different rocks demonstrated different unloading levels. Furthermore, a linear correlation was observed between unloading levels and changing confining pressures, and the gradient is mainly related to the types of rocks. During the unloading tests of rocks, the rational unloading level is recommended to be no higher than the stress level at the elastic-plastic threshold under the corresponding confining pressure. Appl. Sci. 2019, 9, 3164 2 of 15 and the unloading level has no significant effect on the energy evolution process. Zhang [11] and Zhu [12] considered that the unloading stress level mitigated possible damage within rocks during the unloading damage stage. Regarding the initial axial pressure of unloading, Liu et al. [13] selected 50% of the conventional triaxial compressive strength and the corresponding confining pressure, whereas other researchers often adopted 60% and 80% [14][15][16], 70% [17][18][19][20], 80-90% [21], and 15-90% [22]. Most researchers selected 80% of the peak strength as the loaded axial pressure in unloading tests [23][24][25][26]. Details of studies discussed above can be viewed in Table 1. However, mentioned studies failed to consider the effects of the initial axial pressure during exploring the effects of unloading on rock failures.

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Section: Introductionmentioning

confidence: 99%

Elastic-Plastic Threshold and Rational Unloading Level of Rocks

Guo

2019

Applied Sciences

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“…The constitutive model of rock material is the foundation for design and assessment in rock engineering. Many attempts have been made to propose constitutive models to simulate for rock damage behaviour (Wang et al, 2007;Zhou and Zhu, 2010;Ji et al, 2014;Nazarova et al, 2015). Shojaei et al (2014) developed a continuum damage mechanics based constitutive model to describe elastic, plastic and damage behavior of porous rocks.…”

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confidence: 99%

Damage characteristics of sandstone subjected to pre-peak and post-peak cyclic loading

Zhang¹

2019

Acta Geodynamica Et Geomaterialia

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The stability of underground openings concerns the safety of field personnel and engineering facilities in tunnelling and underground mining. The pre-and post-peak damage characteristics of sandstone subjected to triaxial cyclic loading were experimentally studied. The results show that the maximum dissipated energy occurs after the peak stress. The maximum of energy dissipation ratio K and the stress ratio at the K peak point increased with the confining pressure. To estimate the damage characteristics of rock material, the damage variable D was defined based on rock dissipated energy. It is found that the confining pressure has a negligible influence on the damage variable D rate in the pre-peak stage. However, it increased at a lower rate with the increase of confining pressure in the post-peak stage. It is found that the proposed rock damage variable associated with dissipated energy and confining pressure, is a significant indicator of the overall loss of load-carrying capacity of rock in pre-peak and post-peak stages.

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“…Ji et al [31] also proposed a constitutive model for two kinds of rocks, but the tting results were not good. Ji et al concluded that the constitutive relationship can only partially represent the loading characteristics of rock.…”

Section: Experimental Validation Of Modelsmentioning

confidence: 99%

“…paper by Ji et al[31] Theoretical curve 1 in paper by Ji et al[31] (R 2 = 0.5548) Theoretical curve 2 in paper by Ji et al[31] (R 2 = 0.3046) Theoretical curve in this paper (R 2 = 0.7913) Stress (MPa) paper by Ji et al[31] Theoretical curve 1 in paper by Ji et al[31] (R 2 = 0.2819) Theoretical curve 2 in paper by Ji et al [31] (R 2 = 0.5427) Theoretical curve in this paper (R 2 = 0.6956) Stress (MPa) paper by Ji et al [31] Theoretical curve 1 in paper by Ji et al [31] (R 2 = 0.4394) Theoretical curve 2 in paper by Ji et al [31] (R 2 = 0.3695) Theoretical curve in this paper (R 2 = 0.7679Curves of the theoretical tting from Ji et al [31]. (a) Sample no.…”

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Constitutive Model of Rock Uniaxial Damage Based on Rock Strength Statistics

Chen

Guo

2018

Advances in Civil Engineering

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Based on the assumption that rock strength follows the log normal distribution statistically, this paper establishes a damage constitutive model of rock under uniaxial stress conditions in combination with the Mohr–Coulomb strength criterion and damage mechanical theory. Experiments were carried out to investigate the damage evolution process of rock material, which can be categorized into nondamaging, accelerated growth, constant-speed, similar growth, and speed-reducing growth stages. The evolution process had a good corresponding relationship with the rock stress-strain curves. Based on the statistical damage constitutive model proposed in this paper, a numerical fitting analysis was conducted on the uniaxial compression testing data of laboratory sand rock and on experimental data from other literature, in order to validate the rationality of the constitutive equation and the determination of its parameters and to analyze the effect of internal friction variables on damage variables and compression strength. The research outcomes presented in this paper can provide useful reference for the theory of rock mechanics and for rock engineering.

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Damane evolution law based on acoustic emission and weibull distribution of granite under uniaxial stress

Cited by 22 publications

References 24 publications

Elastic-Plastic Threshold and Rational Unloading Level of Rocks

Elastic-Plastic Threshold and Rational Unloading Level of Rocks

Damage characteristics of sandstone subjected to pre-peak and post-peak cyclic loading

Constitutive Model of Rock Uniaxial Damage Based on Rock Strength Statistics

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