Experimental study on AE response and damage evolution characteristics of frozen sandstone under uniaxial compression

Dong, Xihao; Yang, Gang; Liu, Shuai

doi:10.1016/j.coldregions.2021.103424

Cited by 18 publications

(4 citation statements)

References 23 publications

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“…The failure modes of cement mortar and sandstone are shown in Figure 6. The typical failure modes of intact sandstone under uniaxial loading can be divided into slope-failure and split-failure [43]. It can be seen in Figure 6, the failure mode of cement mortar is consistent with that of sandstone [42,44], which means the rock-like material used in this paper can well simulate the natural rock.…”

Section: Mechanical Propertiessupporting

confidence: 52%

Mechanical Properties and Acoustic Emission Characteristics of Anchored Structure Plane with Different JRC under Direct Shear Test

Lin

Feng

et al. 2022

Materials

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Rock mass, the heterogeneous natural material composed of rock and discontinuities, is an important part of engineering construction. Discontinuities affect the mechanical properties of natural rock mass and further threaten the stability of rock engineering. To study the failure characteristics of anchored structure plane with different JRC, jointed specimens with four different JRC were fabricated by pouring cement mortar. Specimens were tested under four different normal loads to figure out how JRC and anchorage angle affect the mechanical properties of anchored structure plane. Besides, acoustic emission (AE) testing technology was adopted to explore the AE characteristics of anchored structural plane under shearing. The results showed that there exists a positive correlation between the peak shear strength and JRC. The undulation shape of structural plane led to an obvious downward trend in the strain softening stage of the structural plane with JRC of 6–8 and 18–20. When the anchorage angle ranged from 45° to 60°, the potentiation of bolt was the most significant. Based on the AE results, the larger the normal stress, the more likely the cumulative count curves were to enter the fast growth phase before the peak. The characteristics of b-value curves are mainly related to the topography of structural planes and whether the bolt is deformed. In the direct shear test, the cumulative proportion of shear cracks was more than 85%, which is much higher than that of tensile cracks. The variation of cumulative tensile cracks goes through three stages: slow growth, rapid growth, and slow growth. Compared with the unanchored structural plane, the variation range of real-time tensile cracks of the anchored structural plane is large, and sometimes the proportion of real-time tensile cracks may reach 80%.

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Section: Mechanical Propertiessupporting

confidence: 52%

Mechanical Properties and Acoustic Emission Characteristics of Anchored Structure Plane with Different JRC under Direct Shear Test

Lin

Feng

et al. 2022

Materials

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“…Some researchers have explored the relationship between confining pressure and the randomness of microscopic defects in rock materials [ [38] , [39] , [40] ]. Some scholars have performed associated studies from the perspectives of the energy dissipation theory [ 41 , 42 ], chemical formula energy phase in the ice-water phase change process, and binary medium theory.…”

Section: Introductionmentioning

confidence: 99%

Research on triaxial compressive mechanical properties and damage constructive model of post-thawing double-fractured quasi-sandstones with different angles

Yun,

Ren,

Zhang

et al. 2024

Heliyon

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“…Some have considered the effects of ambient pressure and the randomness of rock mesoscopic flaws [46,47]. Others have considered energy dissipation theory [48,49]. Some have based their research on the theory of equal chemical potential energy in the process of the ice-water phase transition, and the concept of binary medium [50].…”

Section: Introductionmentioning

confidence: 99%

Triaxial Compression Fracture Characteristics and Constitutive Model of Frozen–Thawed Fissured Quasi-Sandstone

et al. 2022

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The artificial frozen wall crossing the water-rich sand layer is prone to failure during thawing. To study the loading fracture characteristics and damage evolution of single-fissured sandstone after thawing, quasi-sandstones with prefabricated single fissure at different angles were prepared using the sandstone of the Luohe Formation as the original rock to conduct freeze–thaw tests with various temperature differences, and triaxial compression tests were performed on the samples. Based on the distribution theory of rock micro-element strength and static elastic modulus, a damage constitutive model of single-fissured quasi-sandstone under freezing–thawing and confining pressure was established. The results show that with the decrease in freezing temperature, the amount of flake spalling on the sample surface increases, and the frost-heaving cracks of quasi-sandstone become more numerous and longer, which makes the single-fissured quasi-sandstone tend to have a more complex tensile–shear hybrid failure than a shear failure. Moreover, with the increase in fissure angle, the absolute value of the freezing temperature required to produce frost-heaving cracks increases. An S-shaped damage evolution curve corresponds to each stage of triaxial compression of single-fissured quasi-sandstone. With the decrease in freezing temperature, the strength of rock after thawing decreases, and the brittleness characteristics strengthen.

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Experimental study on AE response and damage evolution characteristics of frozen sandstone under uniaxial compression

Cited by 18 publications

References 23 publications

Mechanical Properties and Acoustic Emission Characteristics of Anchored Structure Plane with Different JRC under Direct Shear Test

Mechanical Properties and Acoustic Emission Characteristics of Anchored Structure Plane with Different JRC under Direct Shear Test

Research on triaxial compressive mechanical properties and damage constructive model of post-thawing double-fractured quasi-sandstones with different angles

Triaxial Compression Fracture Characteristics and Constitutive Model of Frozen–Thawed Fissured Quasi-Sandstone

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