Failure characteristics of sandstone specimens with randomly distributed pre-cracks under uniaxial compression

Shi, Hao; Zhang, Houquan; Song, Lei; Yang, Zhi; Yuan, Guotao; Xue, Xinran; Wang, Yu

doi:10.1007/s12665-020-08933-4

Cited by 26 publications

(10 citation statements)

References 45 publications

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“…The contact bond reflects the normal and tangential interactions (forces) between particles (see Figure 2(a)), while the parallel bond transmits both the force and the moment (see Figure 2(b)). It is widely accepted that these two kinds of bonds both exist in the interior of rock and soil [7], so they are used in this paper.…”

Section: Numerical Model Of Cracked Sandstone Specimenmentioning

confidence: 99%

“…The basin sediments are about 100~200 m thick and are of continuous transversal cycles, consisting of beds about 2 m thick. The cracks and joints there caused by the long-time affection of low temperature and ocean erosion have been extremely developed [4][5][6][7], as shown in Figure 1. The existence of cracks not only reduces the material strength of the rock but also accelerates the damage process, which poses safety hazards to the construction of slopes and underground projects [2,5,7,8].…”

Section: Introductionmentioning

confidence: 99%

“…The cracks and joints there caused by the long-time affection of low temperature and ocean erosion have been extremely developed [4][5][6][7], as shown in Figure 1. The existence of cracks not only reduces the material strength of the rock but also accelerates the damage process, which poses safety hazards to the construction of slopes and underground projects [2,5,7,8]. Therefore, it is of great significance to study the strength characteristics of cracked specimens and the interaction of multiple cracks within the specimen.…”

Section: Introductionmentioning

confidence: 99%

“…Only a few studies have looked into the strength characteristics of specimens [2]. Shi et al [2,7] investigated the correspondence between crack distribution modes and rock mechanical properties, as well as the strength damage theory. However, the number of distributed cracks involved in the above studies is excessive; the crack propagation is thus affected by too many factors.…”

Section: Introductionmentioning

confidence: 99%

“…These researches are of great significance for understanding the mechanical properties of defected rock, although large defects exist in crack prefabrication-the width of the cracks is larger than 2 mm [10,14]. Therefore, the research object of this research in the strict sense is fissured rock mass rather than the commonly observed cracked rock mass in nature [5,7]. The mechanical properties of cracked rock mass are obviously not equivalent to that of the fissured rock mass, and the research on cracked specimen is extremely insufficient.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Precrack Angle on the Strength and Failure Characteristics of Sandstone under Uniaxial Compression

Zhang

Chen

et al. 2021

Geofluids

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Characterization of the mechanical properties of cracked rock masses is essential for ensuring the long-term stability of the engineering environment. This paper is aimed at studying the relationship between the strength characteristics of specimen and the angle of precrack, as well as the interaction of cracks under uniaxial compression. To this end, two sandstone specimens, distinguished with a single and three precracks, were built using the PFC software. For the former case, both the peak strength and elastic modulus increase to a peak value as the crack angle α gets closer to the forcing (loading) direction. For the latter case, the strength experiences a trend of increasing-maintaining trend as the crack angle α gets closer to the forcing direction, and the elastic moduli are barely affected. For the specimens containing a single precrack, their crack numbers increased approximately in a one-step or two-step stair pattern with increasing axial strain; whereas for the specimens containing three cracks, their crack numbers all showed a multistep growth trend. Furthermore, the failure mode of the specimen is closely related to the precrack angle. However, if the precrack distribution does not affect the original crack propagation path, it will hardly affect the mechanical properties of the specimen.

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Section: Numerical Model Of Cracked Sandstone Specimenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Effects of Precrack Angle on the Strength and Failure Characteristics of Sandstone under Uniaxial Compression

Zhang

Chen

et al. 2021

Geofluids

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Experimental study on the mechanical properties, acoustic emission characteristics, and permeability evolution of sandstone under triaxial hydromechanical coupling

Wang

Song

Wang

et al. 2022

Energy Science & Engineering

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In situ stress and groundwater have important effects on the deformation and stability of deep underground rock masses. Therefore, it is extremely important to study the mechanical properties and permeability evolutionary processes of rocks under hydromechanical (HM) coupling. The purpose of this study was to investigate the mechanical properties and permeability evolution of sandstone using triaxial compression tests under different confining and seepage pressures. The test results show that the confining pressure can increase the strength of sandstone, whereas the seepage pressure has the opposite effect. The initial and maximum permeabilities were positively correlated with seepage pressure and negatively correlated with confining pressure. The confining and seepage pressures had little effect on the change in initial permeability. As a common parameter of acoustic emission (AE), cumulative AE counts can intuitively reflect the permeability evolutionary process in the sandstone failure process. A permeability evolutionary early warning model for the sandstone failure process under HM coupling is proposed. The results are helpful for understanding the influence of in situ stress and seepage pressure on deep sandstone and the permeability evolutionary mechanism, and they can be used to provide early warning of water inrush disasters in deep underground structures.

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Study on the change of physical properties of sandstone under action of acidic drying-wetting cycles and discrete element simulation

Huang

Pang

2021

Bull Eng Geol Environ

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Failure characteristics of sandstone specimens with randomly distributed pre-cracks under uniaxial compression

Cited by 26 publications

References 45 publications

The Effects of Precrack Angle on the Strength and Failure Characteristics of Sandstone under Uniaxial Compression

The Effects of Precrack Angle on the Strength and Failure Characteristics of Sandstone under Uniaxial Compression

Experimental study on the mechanical properties, acoustic emission characteristics, and permeability evolution of sandstone under triaxial hydromechanical coupling

Study on the change of physical properties of sandstone under action of acidic drying-wetting cycles and discrete element simulation

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