Mechanical Characteristics and Damage Evolution Law of Sandstone with Prefabricated Cracks Under Cyclic Loading

Xu, Yongbin; Ren, Fengyu; Ahmed, Zulkifl; Wang, Kaiyi; Wang, Zihe

doi:10.1007/s13369-021-05460-7

Cited by 18 publications

(6 citation statements)

References 21 publications

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“…Meng et al [17] studied the acoustic emission characteristics and energy evolution characteristics of rock and concluded that the internal structure of rock and axial loading stress were the main factors affecting energy storage. Xu et al [18] conducted a cyclic loading test on cracked sandstone and found the relationship between strength and crack angle. Yin et al [19] conducted shear tests on fractured marl and studied the mechanical properties and failure modes.…”

Section: Introductionmentioning

confidence: 99%

Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles

Yao

Liu

et al. 2022

Energies

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To explore the influence of crack angle on the mechanical properties, energy evolution, and damage evolution of sandstone, uniaxial loading tests were conducted on sandstones with different crack angles. Through the stress–strain curve, the influence of the crack angle on the mechanical properties was analyzed. Based on energy theories and principles, the influence of crack angle on the energy conversion mechanism was analyzed. Based on crack angle and dissipated energy, a damage model considering the initial damage to the fractured sandstones was established. The following conclusions were drawn: (1) The strength and elastic modulus of sandstone decrease with an increase in crack angle, and Poisson’s ratio increases with an increase in crack angle; prefabricated cracks affect the crack initiation position, and accelerate the formation of fracture surfaces. (2) The stress–strain curve was divided into compaction stage, elastic stage, yield stage, and failure stage. The larger the crack angle, the longer the yield stage and the shorter the failure stage. (3) At the peak point, the elastic energy, dissipated energy, and input energy of fractured sandstone always decrease with an increase in crack angle; the energy consumption ratio increases with an increase in crack angle; and the energy storage ratio decreases with an increase in crack angle. (4) The damage variable shows a trend of slow accumulation–steady accumulation–rapid accumulation; the crack angle affects the initial damage of the specimen, and the dissipated energy affects the variation trend of the damage variable.

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Section: Introductionmentioning

confidence: 99%

Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles

Yao

Liu

et al. 2022

Energies

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“…In mining engineering, defective rock mass is a type of complicated engineering medium, as is water conservancy engineering, transportation engineering, and underground tunnel engineering [ 1 , 2 , 3 ]. The complex structure of rock makes its physical properties inhomogeneous and anisotropic, which makes the research of rock masses with defects more difficult [ 4 , 5 , 6 , 7 ]. In previous studies on fractured rocks, cracks are mostly placed in the middle of rock specimens [ 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microcrack Evolution Characteristics of Roof Rock of Coal Seam with Different Angle of Defects Based on Particle Flow Code

et al. 2023

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The creation of the natural ceiling rock of the coal seam is rife with fractures, holes, and other flaws. The angle of the defects has a significant influence on the mechanical characteristics and crack evolution of coal seam roof rock. Multi-scale numerical simulation software PFC2D gets adapted to realize the crack propagation and coalescence process in the roof rock of a coal seam with different angles of defects under uniaxial compression. The effect of flaw angles on the micro and macro mechanical characteristics of rock is also discovered. The results show that: (1) the defect angle has influence on the stress-strain, elastic modulus, peak strength, peak strain, acoustic emission (AE) and strain energy of roof rock of coal seam. When the defect angles are different, the starting position of the roof rock in a coal seam fracture is different. The quantity of microcracks firstly reduces with an increase in defect angles before gradually increasing. At the same fault angle, the cracks are mostly tensile ones and only a few shear ones. (2) When the defect angle is less than 90°, tensile and shear fractures are mostly localized at the defect’s two tips and propagate along the loading direction. When the defect angle is 90°, the tensile and shear cracks are not concentrated at the tip of the defect. (3) As the defect angles increase, the elastic strain energy rises initially and then falls, and the dissipated energy and total input energy both increase continuously. The elastic strain energy is greatest at the highest strength. The study provides a certain reference for the use of various analysis methods in practical engineering to evaluate the safety and stability of rock samples with pre-existing defects.

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“…The creep characteristics of remaining coal pillars and their stability under dynamic pressure are important topics in the field of surrounding rock control in residual coal mining. Research has shown that loading rates considerably influence the damage and deformation patterns, mechanical parameters, and failure characteristics of coal or rock [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Creep and Hardening Characteristics of Anthracite under Graded Static–Dynamic Coupled Loading

Yue,

Wang,

Zhang

et al. 2023

Applied Sciences

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Remaining coal pillars in remining areas exhibit clear creep characteristics, and dynamic pressure accelerates their instability and failure. The creep and hardening characteristics of coal under dynamic pressure are of great engineering significance for the stability of remaining coal pillars in remining areas and their control. To investigate the creep and hardening characteristics of anthracite under static–dynamic coupled loading, graded loading creep tests with different loading rates were conducted. In this research, the creep strain, instantaneous elastic modulus, and creep rate of anthracite were studied under different graded loading rates. The results showed that the hardening effect of the samples manifested as an increasing instantaneous elastic modulus at the loading stage and a decreasing strain rate at the creep stage. When the graded loading rate increases from 0.01 to 0.1 mm/s, the instantaneous elastic modulus increases by 0.16–2.32 times. The sudden increase in the instantaneous elastic modulus at the failure stress level explains the instantaneous failure of the samples well. The actual yield levels corresponding to the peak instantaneous elastic modulus of the samples linearly decreased with increasing graded loading rate. The functional relationship between the graded loading rate and the elastic modulus hardening coefficient, the actual yield stress, and the strain rate decay coefficient were established, which could quantitatively describe the influence of different graded loading rates on the creep and hardening characteristics of anthracite and predict its creep damage.

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Mechanical Characteristics and Damage Evolution Law of Sandstone with Prefabricated Cracks Under Cyclic Loading

Cited by 18 publications

References 21 publications

Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles

Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles

Mechanical and Microcrack Evolution Characteristics of Roof Rock of Coal Seam with Different Angle of Defects Based on Particle Flow Code

Creep and Hardening Characteristics of Anthracite under Graded Static–Dynamic Coupled Loading

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