Experimental study on crack propagation and failure mode of fissured shale under uniaxial compression

Zhang, Xiong; Li, Xiaoshuang; Liu, Yuehua; Liu, Wei; Li, Qihang; Li, Lin

doi:10.1016/j.tafmec.2022.103512

Cited by 27 publications

(5 citation statements)

References 51 publications

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“…When the joint inclination is (30–60)°, the failure mode is mainly shear failure, and the mode of crack is shear crack. The crack surface slips along the weak surface of the structure, and the friction effect is strong during expansion, resulting in an increase in temperature 7 , 36 .…”

Section: Discussionmentioning

confidence: 99%

Study on the infrared dynamic evolution characteristics of different joint inclination phyllite under uniaxial compression

Chengyu,

Weihang,

Ziwei

et al. 2023

Sci Rep

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The destructive behavior of rocks and the evolution behavior of cracks are highly correlated. With the continuous development process of crack, the stress state of rock is constantly broken until entirely failed, so it is necessary to study the spatial and temporal behavior characteristics of the crack in the process of rock destruction. In this paper, the destruction process of phyllite specimens is analyzed by thermal imaging technology, and the temperature evolution process of the crack is studied to explore the infrared characteristics of the crack evolution process. Furthermore, a model for predicting rock destruction time is proposed based on Bi-LSTM recurrent neural network model combined with Attention mechanism. The results show that: (1) During the development of rock cracks, the rock surface shows a stable dynamic infrared response, and shows different evolutionary characteristics in different stages, mainly including temperature reduction in the compaction stage, temperature rise in the elastic and plastic stages, and temperature peaks in the failure stage; (2) During the evolution of the crack, rock destruction has a significant control effect on the IRT field along the fracture tangential and normal direction, and its distribution has the volatility controlled by the time; (3) The recurrent neural network method is used to predict the rock failure time, the results can be used as a method to predict the time of rock destruction, and it can be further put forward the corresponding protective measures accordingly, to maintain the long-term stability of the rock mass.

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Section: Discussionmentioning

confidence: 99%

Study on the infrared dynamic evolution characteristics of different joint inclination phyllite under uniaxial compression

Chengyu,

Weihang,

Ziwei

et al. 2023

Sci Rep

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show abstract

“…Most conventional rock fracture studies have been based on homogeneous, continuous media mechanics models, which are difficult to apply to the study of fracture evolution and damage mechanisms in weakly cemented rocks. Weakly cemented rocks, which consist of large numbers of particles and cementing materials, are structurally complex and produce discrete properties in terms of mechanical properties [21][22][23].…”

Section: Correlation Analysis Of Rock Meso-parameters and Macro-mecha...mentioning

confidence: 99%

“…The rock relies mainly on the friction between particles to resist external influences [24][25][26][27][28], namely, the carrying capacity of the residual after the peak. cementing materials, are structurally complex and produce discrete properties in terms of mechanical properties [21][22][23].…”

Section: Deformation Law Of Rock Under Uniaxial Compressionmentioning

confidence: 99%

Influence of Mesoscopic Parameters of Weakly Cemented Rocks on Macroscopic Mechanical Properties

et al. 2022

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In weakly cemented rocks, the mesoscopic parameters have a great influence on the macroscopic mechanical properties. One example of a typical weakly cemented rock is the Cretaceous coarse sandstone in the Hongqinghe Coal Mine. In this study, rock samples were subjected to physical and mechanical experiments, from which a sample model was constructed based on particle flow theory. Uniaxial compression numerical simulation experiments and analyses were conducted, and sensitivity analyses of various microscopic parameters in relation to the macroscopic mechanical properties of the rock were performed via a control variable method. A response mechanism between the macroscopic and mesoscopic parameters was then inferred. On the microscopic scale, the rock is porous with a loose structure and extremely low average uniaxial compressive strength, indicating looseness and weakness. The mesoscopic parameters were then divided into three grades based on their degrees of influence from high to low on the peak strength, peak strain, and elastic modulus. Laboratory experiments revealed that the fracture form of weakly cemented coarse sandstone is typically due to single-section shear failure, whereas through simulation, cracks are caused mainly by tension failure. These two failure modes were inferred to be consistent with each other.

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“…However, research on the charge induction law from the perspective of the fracture properties of the coal body is lacking. In addition, the coal seam contains different degrees of primary fractures due to deposition and crustal movement during formation processes, and the fracture assignment in the coal body determines its physical and mechanical properties, which in turn affect the damage characteristics of the coal body under load and instability 32 , 33 . Therefore, this paper aims to investigate the mechanical properties during uniaxial compression rupture and the charge time–frequency signal response law of coal body materials with primary fissures of varying degrees.…”

Section: Introductionmentioning

confidence: 99%

Research on charge induction law and application of coal samples with different fissures

Wang,

Gao,

Wang

et al. 2023

Sci Rep

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Indoor testing are performed to explore the charge induction law during the uniaxial compression fracture process of coal samples, and the charge time and frequency domain signals of coal samples with different primary fissures are analyzed in the paper. On-site monitoring of charge in different fissures distribution areas of underground coal tunnels, and the charge signals of different drillingdepths in coal seams are analyzed. The results show that the uniaxial compressive strength and elastic modulus of multi-fissured coal samples are less than those of less fissured coal samples, and the Poisson’s ratio is greater than those of less fissured coal samples. The charge induction signal intensity during the fracture process of multi-fissured coal samples is relatively low, but it is concentrated at the low frequency of 0–50 Hz in the compacting elasticity stage. The charge signal intensity during the fracture process of coal samples with less fissure is relatively high, and the charge frequency during the reinforcement damage stage is concentrated at a low frequency of 0–50 Hz. Therefore, the sudden appearance of low-frequency charge signals is more suitable as effective precursor information for the instability and failure of less fissured coal bodies. The average charge intensity is small in the multi-fissured area with a drilling depth of 1–4 m in the coal seam, and the average charge intensity of the coal body with less fissures is larger in the 5–12 m region. The on-site charge monitoring results have good consistency with the indoor test results. This study has guiding significance in setting up a charge monitoring warning index of instability failure in different coal body fissures regions.

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Experimental study on crack propagation and failure mode of fissured shale under uniaxial compression

Cited by 27 publications

References 51 publications

Study on the infrared dynamic evolution characteristics of different joint inclination phyllite under uniaxial compression

Study on the infrared dynamic evolution characteristics of different joint inclination phyllite under uniaxial compression

Influence of Mesoscopic Parameters of Weakly Cemented Rocks on Macroscopic Mechanical Properties

Research on charge induction law and application of coal samples with different fissures

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