Constitutive model of rock triaxial damage based on the rock strength statistics

Chen, Kai

doi:10.1177/1056789520923720

Cited by 36 publications

(37 citation statements)

References 66 publications

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“…In this case, the dynamic properties of underground excavations, including strength, moduli, etc. may increase, while the energy for rock fracture decreases and even negative values (Chen, 2020;Li et al, 2017Li et al, , 2020Zhu et al, 2021). The dynamic failure process of surrounding rock is violent, which is often considered as rockburst.…”

Section: Dynamic Failure Pattern Identification Of Surrounding Rockmentioning

confidence: 99%

Experimental investigation on dynamic mechanical properties and fracture evolution behavior of the underground openings with excavation damaged zones

Zhao

Tao

et al. 2022

International Journal of Damage Mechanics

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The existence of excavation damaged zone (EDZ) generally influences the stability and safety of the underground openings. To investigate the influence of EDZ on the stability of underground excavation under dynamic stress disturbances, underground excavations with EDZs are represented by holed rock specimens with damage zones. The fracture evolution and dynamic mechanical properties of damaged holed rock specimens under dynamic loads are investigated by using the improved Split Hopkinson Pressure Bar (SHPB). The results have shown that the stress-strain curve of the rock specimens with damage zones is divided into pre-peak and post-peak stages, without compaction and elastic deformation stages. The dynamic strength, peak deformation moduli, and crack initiation stress decrease while the strain rate, absorbed energy, and failure time of holed specimens increase with increasing damage around circular holes. The failure of the holed rock specimens always start from circular holes, and specimens without or with minor damage exhibit overall tensile-shear failure. However, the failure of rock specimens with a greater damage condition mainly appears within damage zones around circular holes in the form of spalling or compression-shear failure, and the failure zone increases with increasing damage of surrounding rocks. The failure around and away from circular holes of specimens without or with minor damage is respectively characterized by intergranular and transgranular cracks. The results of the present study provide implications to the disaster prevention and support design of underground openings with EDZ.

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Section: Dynamic Failure Pattern Identification Of Surrounding Rockmentioning

confidence: 99%

Experimental investigation on dynamic mechanical properties and fracture evolution behavior of the underground openings with excavation damaged zones

Zhao

Tao

et al. 2022

International Journal of Damage Mechanics

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“…Many studies have shown that before the appearance of macro-cracks due to loads, the mechanical properties of materials are affected by local micro-cracks (Chan et al, 1997;Ji et al, 2011;Liu and Su, 2016). According to the hypothesis of strain equivalence, the damage constitutive model of materials can be expressed as follows (Chen, 2020;Lemaitre, 1984;Xie et al, 2020) r ¼Ẽe ¼ Eeð1 À DÞ…”

Section: Model Buildingmentioning

confidence: 99%

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Wang

Zhang

Song

et al. 2021

International Journal of Damage Mechanics

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To study the effect of loading rate on the mechanical properties of salt rock, uniaxial compression tests and acoustic emission tests at different loading rates were carried out on salt rock specimens. The test results show that with increases in loading rate, the peak stress of salt rock increases first and then essentially remains unchanged, and the elastic modulus increases gradually, while the strain at peak stress decreases gradually. Moreover, the Poisson’s ratio is independent of loading rate. The macroscopic failure modes of the salt rock specimens at different loading rates are all ‘X’-type conjugate shear failure. However, the loading rate is closely related to the degree of fracture, such that the smaller the loading rate is, the higher is the degree of fracture of salt rock. In order to describe the stress–strain behaviour in the process of salt rock failure, a damage variable expression represented by the deformation modulus was proposed, and a rock damage constitutive model was established according to the theory of continuum damage mechanics. The rationality of the damage constitutive model was verified by using the present uniaxial compression test results of salt rock and existing test data from the literature. The results show that the model can accurately describe the stress–strain response of rock in the failure process.

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“…Based on the exponential function of bolt load displacement curve proposed in reference (Ying et al, 2005), a modified exponential function model is proposed by introducing statistical damage mechanics (Rinaldi et al, 2007;Chen, 2020;Xie et al, 2020). By analyzing the deterioration law of the pullout stiffness of the exponential function model, it is found that the pullout stiffness of the bolt in the model decreases exponentially with the displacement.…”

Section: Introductionmentioning

confidence: 99%

Bar load-displacement curve model based on statistical damage mechanics

et al. 2022

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The load displacement curve model of bolt is of great significance to estimate the ultimate uplift bearing capacity of bolt and analyze the force transmission of bolt. Therefore, it is particularly necessary to establish a high-precision load displacement curve model of bolt. In this paper, the statistical damage theory is introduced to establish a new stiffness degradation model of bolt load displacement curve, and a model which is more consistent with the test data and has higher accuracy in predicting the ultimate uplift capacity is proposed. The influence of model parameters on the model curve is analyzed. It can be concluded that the key to the load displacement curve of the anchor and the prediction of the uplift bearing capacity of the anchor is to determine the statistical random distribution characteristics of the micro element strength of the anchor interface.

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Constitutive model of rock triaxial damage based on the rock strength statistics

Cited by 36 publications

References 66 publications

Experimental investigation on dynamic mechanical properties and fracture evolution behavior of the underground openings with excavation damaged zones

Experimental investigation on dynamic mechanical properties and fracture evolution behavior of the underground openings with excavation damaged zones

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Bar load-displacement curve model based on statistical damage mechanics

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