Crack Failure Characteristics of Different Rocks Under the Action of Frost Heaving of Fissure Water

Zhang, Guangze; Xu, Zhengxuan; Yang, Yang; Zhao, Lin

doi:10.3389/feart.2020.00013

Cited by 15 publications

(7 citation statements)

References 32 publications

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“…It is evidenced that a huge frost heaving pressure is produced to drive the propagation of voids and joints and thus cause the instability of joint rock masses during the freezing process (Huang et al, 2022(Huang et al, , 2023. Fortunately, the bonding strength between ice and joint wall can strengthen the joints themselves after complete freezing (Matsuoka and Murton, 2008;Zhang et al, 2020;Shan et al, 2021;Wang et al, 2022). However, if the joint ice were thawed, the rock-icerock "sandwich" structure would be debonded and unstable.…”

Section: Introductionmentioning

confidence: 99%

The temperature-dependent shear strength of ice-filled joints in rock mass considering the effect of joint roughness, opening and shear rates

Huang¹,

Cai²,

Xin³

et al. 2023

The Cryosphere

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Abstract. Global warming causes many rockfall activities in alpine mountains, especially when ice-filled joints in the rock mass become thawed. The warming and thawing of frozen soils and intact rocks have been widely studied in the past several decades; however, the variation of shear strengths of ice-filled joints is not fully understood. In this study, a series of compression–shear experiments were conducted to investigate the shear strength of ice-filled rock joints by considering the effects of joint roughness, temperature, opening, shear rates and normal stress. The joint roughness can improve the shear strength of ice-filled joints. However, the contribution of joint roughness is controlled by some noticeable bulges instead of the joint roughness coefficient (JRC) index. The peak shear strength of the ice-filled joint linearly increases with the increasing aggregation of rupture ice area before these noticeable bulges. As the joint opening increases, the effect of joint roughness decreases, and the shear strength of ice-filled joints tends to be equal to the shear strength of pure ice. In addition, the shear strength quickly reduces with increasing temperature from −15 to −0.5 ∘C. The shear failure mode changes from shear cracking of joint ice to the shear debonding of the ice–rock interface above −1 ∘C. Increasing shear rate decreases the shear strength of ice-filled joints because the joint ice displays the brittle failure phenomenon at a high shear rate. The peak shear strength of the ice-filled joint linearly increases with the increase in normal stress. Moreover, it is also proved that the Mohr–Coulomb criterion can be used to characterize the shear strength of ice-filled joints under different normal stresses. This research can provide a better understanding of the warming degradation mechanism of ice-filled joints by considering the abovementioned important influencing factors.

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Section: Introductionmentioning

confidence: 99%

The temperature-dependent shear strength of ice-filled joints in rock mass considering the effect of joint roughness, opening and shear rates

Huang¹,

Cai²,

Xin³

et al. 2023

The Cryosphere

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“…Research has also been conducted on the mechanical properties of fractured rock masses. Zhang et al (2020) combined with the theory of frost heaving mechanics and fracture mechanics, carried out the freeze-thaw cycle test, and analyzed failure modes and mechanical characteristics of crack growth. Li et al (2022) analyzed the influence of prefabricated crack angles on the mechanical properties and failure modes of coal samples under uniaxial compression.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on strength and failure characteristics of mortar specimens with prefabricated cracks under uniaxial and triaxial stress

Pan,

Wan,

Jiang

et al. 2023

Front. Mater.

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Cracks in rock masses have adverse effects on their mechanical characteristics and the stability of rock mass engineering. For this experiment, uniaxial compression and true triaxial compression unloading tests were conducted on mortar specimens. The strength of the specimens was the lowest when the dip angle of the crack was 45°. Under uniaxial compression, the failure mode was mainly tensile failure. With an increase in the crack dip angle of the specimens, the types of cracks changed from shear to tensile cracks. Under true triaxial compression, the confining pressure considerably increased the strength and deformation characteristics of the specimens and weakened the influence of the crack dip angle on the strength. The failure mode when the crack dip angle was 15° was mainly tensile. The failure mode when the crack dip angles were 45° and 75° was mainly tensile–shear composite. With the increase in the crack dip angle, the failure degree of the specimens was more severe. Under the triaxial unloading confining, the failure mode was mainly shear. Compared with uniaxial compression, the failure degree of the specimens was more severe under true triaxial compression and true triaxial unloading. The innovation of this experiment is the use of a special mold to prepare specimens. We recommend that scholars conduct experimental and numerical simulation studies on different crack geometries.

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“…This nonsynchronous correspondence between time and space makes the failure mechanism of the slope under compound mining unloading more complicated. Therefore, in-depth research on the deformation and fracture characteristics of fractured rock masses under the coupling of heavy rainfall infiltration and mining unloading can ensure the safety and stability of mine slopes (Vandamme and Roegiers, 1990;Shao and Rudnicki, 2000;Tang et al, 2016;Liu et al, 2020b;Yao et al, 2020;Zhang et al, 2020;Deng et al, 2021;Liu et al, 2021;Zuo et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Research on Deformation and Fracture Characteristics of the Fractured Rock Mass Under Coupling of Heavy Rainfall Infiltration and Mining Unloading

Wang

Shuang-suo

et al. 2022

Front. Earth Sci.

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The present study used PFC numerical software to examine the mechanical properties and fracture propagation characteristics of the fractured rock mass under coupling of heavy rainfall infiltration and mining unloading. Based on the engineering background of the Dexing mine, the pore water pressure is set to 0, 0.5, 1.0, 1.5, and 2.0 mpa, the true triaxial lateral unloading rate is 0.3 mpa/level and 0.6 mpa/level, and the water content state of rock is dry, natural, and saturated. Then, the true triaxial compression numerical simulation test is carried out, and the results showed that with the increase of the water content, the rock compaction stage increases, the elastic stage shortens, and the yield stage becomes more obvious. The faster the unloading rate is, the greater the influence on the rock strain is. After unloading, the stress jump point appears and the strain increase rate becomes larger, the volume of the rock increases and occurs as large s in the unloading direction, and finally it leads to severe brittle failure of the rock. With the increase of rock pore water pressure, the compressive strength and the peak strain of the rock decrease, and the pore water pressure accelerates the process of rock failure.

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Crack Failure Characteristics of Different Rocks Under the Action of Frost Heaving of Fissure Water

Cited by 15 publications

References 32 publications

The temperature-dependent shear strength of ice-filled joints in rock mass considering the effect of joint roughness, opening and shear rates

The temperature-dependent shear strength of ice-filled joints in rock mass considering the effect of joint roughness, opening and shear rates

Experimental study on strength and failure characteristics of mortar specimens with prefabricated cracks under uniaxial and triaxial stress

Research on Deformation and Fracture Characteristics of the Fractured Rock Mass Under Coupling of Heavy Rainfall Infiltration and Mining Unloading

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