Acoustic Emission Associated with Self-Sustaining Failure in Low-Porosity Sandstone Under Uniaxial Compression

Zhang, Shihuai; Wu, Shunchuan; Chu, Chaoqun; Guo, Pei; Zhang, Guang

doi:10.1007/s00603-018-1686-8

Cited by 57 publications

(20 citation statements)

References 40 publications

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“…e white circle stands for shear failure, and the red circle stands for tension fracture. Using acoustic emission technique to study the occurrence and development of microcracks in rock under different loading rates is conducive to understand rock rupture process and deformation law comprehensively and truly [26,27].…”

Section: Failure Feature Analysismentioning

confidence: 99%

Numerical Test Research on Loading Rate Effect of Rock Mass with Transfixion Sawtooth Structural Plane

Li¹,

Chen

et al. 2020

Advances in Civil Engineering

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In this paper, numerical test research is carried out on the loading rate effect of a numerical specimen (sample C) with a transfixion sawtooth structural plane by using the rock failure process analysis (RFPA) 2D software. In order to study the mechanical characteristics difference between the rock mass with this kind of structural plane and other rock masses, the intact numerical specimen (sample A) of no structural plane and the numerical specimen (sample B) with smooth structural plane are also simulated. The uniaxial compression tests were carried out for each specimen under five loading rates of 0.002, 0.005, 0.008, 0.02, and 0.05 mm/s. The following several conclusions are obtained by the numerical test. When the loading rate is 0.002 or 0.005 mm/s, the failure mode of the numerical specimen C is an inclined linear fracture zone located in the middle and lower part of the rock mass; however, when the loading rate rises to 0.008, 0.02, and 0.05 mm/s, the fracture zone of the numerical specimen C is located in the middle and upper part of the rock mass, and its inclination angle is about 60 degrees. The peak strength, residual strength, and stress drop of the specimens A, B, and C increase with the addition of loading rate; the peak strength and stress drop of the sample C are higher than those of the other two samples. When the loading rate is 0.002 mm/s, the residual strength of sample C is lower than that of samples A and B, and the other four kinds of loading conditions are higher than those of specimens A and B. Based on the acoustic emission (AE) information, it can be seen that the failure modes of the numerical specimen C under five loading conditions are tensile failure. The AE accumulated energy decreases with the increase of loading rate, but the change law of AE accumulated number is opposite.

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Section: Failure Feature Analysismentioning

confidence: 99%

Numerical Test Research on Loading Rate Effect of Rock Mass with Transfixion Sawtooth Structural Plane

Li¹,

Chen

et al. 2020

Advances in Civil Engineering

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“…Crack defect propagation has long been a focus of research for rock mechanics researchers [1][2][3]. For in-depth studies, scholars have performed a lot of advanced tests and pioneering work from different aspects by laboratory tests [4,5], numerical simulation [6][7][8], and theoretical derivation [9,10].…”

Section: Introductionmentioning

confidence: 99%

Particle Flow Code Simulation of the Characteristics of Crack Evolution in Rock-Like Materials with Bent Cracks

Cheng

Gong

et al. 2021

Geofluids

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The distribution and propagation of rock cracks have a significant impact on geotechnical engineering. Taking rock-like materials with bent cracks as the research object, the particle flow code in two dimensions numerical simulation method was used to study the impact of the bend number on rock-like materials strength and crack evolution. According to the results, when the bend number was 1, 3, and 7, the strength of the specimens gradually increased; the elasticity modulus did not change significantly with the crack bend number. Uniaxial compression generated tensile cracks in all the specimens with bent cracks, but in terms of failure mode, the specimens with 0 bend tended to suffer penetrating failure along the fracture strike, while the specimens with 1, 3, and 7 bend tended to suffer penetrating failure along the diagonal direction. Both the fractal dimension and bend number were positively correlated with strain; with the gradual increase of the stress percentage, the damage variable of the specimens gradually increased at a growing rate. The research results provide a reference for predicting the stability of the underground engineering surrounding rocks containing bent cracks.

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“…3,4 In order to understand these abundant mechanical properties, micromechanics and continuum mechanics are often utilized. The former generally includes acoustic emission [5][6][7][8] and thin section inspection. 9 It has been revealed that the progressive development of a macroscopic deformation band essentially depends on the initiation, growth, and coalescence of microcracks associated with the local stress heterogeneity.…”

Section: Introductionmentioning

confidence: 99%

Elastoplastic constitutive behavior and strain localization of a low-porosity sandstone during brittle fracturing

Zhang¹,

Guo²,

Wu³

2021

Preprint

Self Cite

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We investigated the elastoplastic behavior and strain localization of the Zigong sandstone (porosity: 6.5%) during brittle fracturing based on two series of axisymmetric compression experiments. The experiments were conducted under various confining pressures (σ3 = 0 ~ 80 MPa). For each confining pressure, the sandstone specimens were deformed under constant axial and circumferential strain rates, respectively. When σ3 < 60 MPa, the sandstone first undergoes stable deformation in the post-peak stage and then loses its stability. Before the emergence of instability, the mechanical behavior is hardly affected by the controlling method. When the confining is larger, the sandstone manifests a stable failure process during the whole loading stage. The observed elastoplastic behavior was described by a two-yield surface constitutive model established in the framework of generalized plastic mechanics. The proposed constitutive model incorporates two quadratic yield functions, as well as two linearly independent plastic potential functions, to honor the shear yield and volumetric dilatancy, respectively. Via the return mapping algorithm, the proposed constitutive model was verified by comparing the numerical results with experimental results. In addition, the two-yield surface constitutive model, which is equivalent to the model proposed by Rudnicki and Rice,1 was applied to localization analysis. Assuming that the onset of localization occurs at peak stress, frictional coefficient μ and dilatancy factor β were determined from experimental data. The variations of both plastic parameters predict the transition of localization mode from pure dilation bands under uniaxial compression to pure shear bands at high confining pressures, which is consistent with the experimental observations.

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Acoustic Emission Associated with Self-Sustaining Failure in Low-Porosity Sandstone Under Uniaxial Compression

Cited by 57 publications

References 40 publications

Numerical Test Research on Loading Rate Effect of Rock Mass with Transfixion Sawtooth Structural Plane

Numerical Test Research on Loading Rate Effect of Rock Mass with Transfixion Sawtooth Structural Plane

Particle Flow Code Simulation of the Characteristics of Crack Evolution in Rock-Like Materials with Bent Cracks

Elastoplastic constitutive behavior and strain localization of a low-porosity sandstone during brittle fracturing

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