Fracture mechanical behavior of red sandstone containing a single fissure and two parallel fissures after exposure to different high temperature treatments

Yang, Sheng‐Qi; Jing, Hongwen; Huang, Yan‐Hua; Ranjith, P.G.; Jiao, Yu‐Yong

doi:10.1016/j.jsg.2014.10.014

Cited by 70 publications

(17 citation statements)

References 57 publications

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“…com] information has been reported. For example, Yang et al 43,44 analysed the crack initiation and propagation process of single-flawed sandstone and granite specimens, as well as crack coalescence patterns of twoflawed sandstone specimens under uniaxial compression. However, the crack coalescence behaviour of rocks containing three or more flaws that are exposed to high temperatures has not been investigated comprehensively, which is much more complicated than that with one or two flaws.…”

Section: Introductionmentioning

confidence: 99%

“…However, the crack coalescence behaviour of rocks containing three or more flaws that are exposed to high temperatures has not been investigated comprehensively, which is much more complicated than that with one or two flaws. To investigate the crack coalescence mechanism of preflawed rocks after hightemperature treatments and to extend the previous experimental study of Yang et al, 43,44 uniaxial compression tests on three-flawed sandstone specimens heated to high temperatures were performed in this study. The effects of thermal treatment and flaw inclination angle on the stress-strain curve, peak strength, elastic modulus and peak strain of the preflawed specimens were investigated.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on fracture behaviour of three‐flawed sandstone specimens after high‐temperature treatments

Huang

Yang

Dong

2020

Fatigue Fract Eng Mat Struct

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The crack coalescence of rocks significantly affects the stability of rock engineering, and extensive studies have been performed on preflawed rock specimens without thermal treatment. However, the fracturing behaviour of preflawed specimens after thermal treatment has not been investigated comprehensively. In this study, three‐flawed sandstone specimens with different flaw inclinations after high‐temperature treatments were tested under uniaxial compression. Photographic, acoustic emission and digital image correlation techniques were used to investigate the crack initiation, propagation and coalescence behaviour. Experimental results show that the peak strength, elastic modulus and peak strain of the three‐flawed specimens were lower than those of intact specimens and that they gradually recovered with increasing flaw angle. The peak strength and elastic modulus first increased and then decreased, whereas the peak strain increased with temperature. Noncoalescence, indirect coalescence and direct coalescence were three patterns observed between the two adjacent pre‐existing flaws. Finally, the mechanism of high temperature in alteration of the mechanical properties of sandstone was revealed through microobservations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental study on fracture behaviour of three‐flawed sandstone specimens after high‐temperature treatments

Huang

Yang

Dong

2020

Fatigue Fract Eng Mat Struct

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“…However, the existing studies show that local thermal stress will be generated between mineral particles due to the differences in the thermal expansion coefficient between rock mineral particles at high temperature. In this way, the internal structure of the particles will change substantially, and thermal cracking may occur in the rock, which eventually affects the physical and mechanical properties of the rock [14][15][16][17][18][19]. Besides, it is also well known that the fracture trajectories and fracture roughness and surface morphology are strictly related to the seepage behavior of geofluids.…”

Section: Introductionmentioning

confidence: 99%

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Zhang

2019

Advances in Materials Science and Engineering

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To evaluate the stability and compactness of high-temperature underground construction, it is necessary to test the fracture toughness of surrounding rock (red sandstone) under real-time high temperature. In this paper, SCB specimens recommended by the International Society for Rock Mechanics are used to measure the mode I fracture toughness of red sandstone at real-time high temperatures. Also, to reveal its fracture characteristics and fracture mechanism, the fracture morphology observation (SEM experiment), XRD experiment, mercury intrusion porosimetry testing, and fractal measurement of fracture trajectory are carried out on the red sandstone specimens at various temperatures. The results show that (1) temperature may have a significant impact on the fracture toughness and fracture characteristics of red sandstone. On the whole, the fracture toughness values decrease with the increase in temperature, while the fractal dimensions of fractal trajectories increase with the increase in temperature. (2) Temperature has a significant influence on the fracture mode of red sandstone. At relatively low temperatures (20°C–400°C), the main fracture mode is transgranular failure. At relatively high temperatures (400°C–700°C), the fracture mode is mainly intergranular failure. (3) The weakening mechanism of red sandstone is mainly due to the effect of thermal dehydration when the temperature is between 100°C and 400°C. When the temperature is between 400°C and 700°C, the weakening mechanism is mainly due to thermal cracking and the α-β phase transition of quartz.

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“…Based on the experimental research and PFC numerical simulation, Jin et al [2] generalized that, with the increase of flaw angle, the tensile cracks initiate from gentle flaw and shear cracks emerge at tips of steep flaws. Yang [3] argued that the cracking process depended on both the fissure geometry and the heat treatment temperature. Chen et al [4] carried out uniaxial compression experiments on the sandstone samples containing double fissures and a single circular hole and thought that the peak strength, peak strain, and elastic modulus of defected specimens show decreased trend firstly and then increase with changing from 0 ∘ to 90 ∘ .…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Mechanical Characteristics and Deformation Behaviour of Fractured Rock‐Like Material with One Single Fissure under the Conventional Triaxial Compression

Xiao

Huang

Cheng

et al. 2018

Shock and Vibration

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An experimental study was carried out on a rock-like material specimen containing a single fissure to investigate its mechanical characteristics and deformation behaviour under triaxial compression. The mechanical characteristics, such as peak strength and residual strength, are discussed. The confining pressure had a distinct effect on the ductility characteristics of the specimen. “A distinct stress drop” occurred in the early stage of the stress-strain curve when the length fissure was relatively long. The I-crack, II-crack, and III-crack are all observed under triaxial compression, and the III-crack is commonly observed under triaxial compression. Confining pressure plays an essential role in affecting the failure mode of the specimen. There are three kinds of failure modes in the triaxial compression experiment on a rock-like material specimen with one single fissure: tensile-shear comprehensive failure, “X”-shaped shear failure, and shear failure along the fissure plane. These results are important and fundamental to understand the fracture mechanism of rock engineering.

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Fracture mechanical behavior of red sandstone containing a single fissure and two parallel fissures after exposure to different high temperature treatments

Cited by 70 publications

References 57 publications

Experimental study on fracture behaviour of three‐flawed sandstone specimens after high‐temperature treatments

Experimental study on fracture behaviour of three‐flawed sandstone specimens after high‐temperature treatments

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Experimental Investigation on the Mechanical Characteristics and Deformation Behaviour of Fractured Rock‐Like Material with One Single Fissure under the Conventional Triaxial Compression

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