Analysis of pre-peak strain energy storage transformation mechanism of diorite under triaxial loading–unloading paths

An, Xuexu; Su, Yan; Tao, Ling; Tian, Anmin; Hu, Z.Q.

doi:10.1007/s10064-023-03310-4

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…With an identical unloading rate, the peak deviatoric stress of the rock samples increases with confining pressure, indicating an enhancement in the maximum load-bearing capacity of the samples. This observation aligns with findings from existing research [42,43], suggesting that higher confining pressures enhance lateral constraints on the rock samples, thereby facilitating more effective stress transfer and adjustment among internal particles.…”

Section: Loading and Unloading Strength Curvessupporting

confidence: 90%

Effect of Confining Pressure on the Macro- and Microscopic Mechanisms of Diorite under Triaxial Unloading Conditions

Duan,

Yang,

2024

Buildings

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In this study, the response mechanism between macro- and microscales of deep hard-rock diorite is investigated under loading and unloading conditions. Moreover, the statistical theory is combined with particle flow code simulations to establish a correlation between unloading rates observed in laboratory experiments and numerical simulations. Subsequent numerical tests under varying confining pressures are conducted to examine the macroscopic mechanical properties and the evolution of particle velocity, displacement, contact force chain failures, and microcracks in both axial and radial directions of the numerical rock samples during the loading and unloading phases. The findings indicate that the confining pressure strength curve displays an instantaneous fluctuation response during unloading, which intensifies with higher initial confining pressures. This suggests that rock sample damage progresses in multiple stages of expansion and penetration. The study also reveals that with increased initial confining pressure, there is a decrease in particle velocity along the unloading direction and an increase in particle displacement and the number of contact force chain failures, indicating more severe radial expansion of the rock sample. Furthermore, microcracks predominantly accumulate near the unloading surface, and their total number escalates with rising confining pressure, suggesting that higher confining pressures promote the development and expansion of internal microcracks.

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Section: Loading and Unloading Strength Curvessupporting

confidence: 90%

Effect of Confining Pressure on the Macro- and Microscopic Mechanisms of Diorite under Triaxial Unloading Conditions

Duan,

Yang,

2024

Buildings

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“…Li et al [8] conducted loading and unloading tests with various confining pressures to investigate the mechanical properties of marble material samples, and found that in the loading and unloading test, peak strength, lateral strain, axial strain and plastic deformation increase significantly as the confining pressure increases. An et al [9] analyzed the evolution of the pre-peak strain energy of diorite under triaxial loading and unloading paths using laboratory tests and numerical simulations. They found that the ultimate strain energy accumulation capacity of diorite increased with the timing of unloading confining pressure and axial loading rate, while it decreased with the unloading confining pressure rate.…”

Section: Introductionmentioning

confidence: 99%

Conventional triaxial loading and unloading test and PFC numerical simulation of rock with single fracture

Tang,

Chen,

Xiong

et al. 2024

Archives of Civil Engineering

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Take the metamorphic sandstone as the reference object, by making rock like samples with fractures, the conventional triaxial loading and unloading test and PFC numerical simulation of rock like sample with single fracture were conducted, and the effects of the loading path, inclined angle of fracture, axial stress level during unloading, initial confining pressure during unloading on the compressive strength, peak strain and crack propagation evolution of the samples were considered. The compressive strength of the specimen under triaxial unloading is smaller than that under triaxial loading. The peak strain of the specimen under triaxial unloading is also smaller than that under triaxial loading. The specimen is more prone to brittle failure. When the axial stress level is the same during unloading, with the increase of the initial confining pressure during unloading, the difference of the compressive strength of the specimens with different inclined angles of fracture gradually decreases. Under the condition of uniaxial compression and triaxial compression, the failure of all specimens is tensile failure, and the shear failure is the main one during unloading.

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A computational method for tunnel energy evolution in strain-softening rock mass during excavation unloading based on triaxial stress paths

Zheng,

Shi,

Lou

et al. 2024

Computers and Geotechnics

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Analysis of pre-peak strain energy storage transformation mechanism of diorite under triaxial loading–unloading paths

Cited by 5 publications

References 43 publications

Effect of Confining Pressure on the Macro- and Microscopic Mechanisms of Diorite under Triaxial Unloading Conditions

Effect of Confining Pressure on the Macro- and Microscopic Mechanisms of Diorite under Triaxial Unloading Conditions

Conventional triaxial loading and unloading test and PFC numerical simulation of rock with single fracture

A computational method for tunnel energy evolution in strain-softening rock mass during excavation unloading based on triaxial stress paths

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