Slip behavior of rough rock discontinuity under high velocity impact: Experiments and models

Wang, Feili; Xia, Kaiwen; Yao, Wei; Wang, Shuhong; Wang, Chonglang; Xiu, Zhanguo

doi:10.1016/j.ijrmms.2021.104831

Cited by 29 publications

(10 citation statements)

References 40 publications

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“…Specimens with dimensions of 230 mm ðlengthÞ × 65 mm ðwidthÞ × 10 mm ðthicknessÞ were cut from the same SM block and polished. The rock discontinuity profiles parallel to the longest edge were engraved on the rectangular cuboid SM block along the central axis direction [27]. The rock discontinuity specimen is illustrated in Figure 1(d).…”

Section: Impact Shear Testsmentioning

confidence: 99%

Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling

Wang

et al. 2022

Lithosphere

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The presence of discontinuities can significantly weaken rock masses, whose shear load-bearing capacity is always dictated by discontinuity failures. The shear response of rock discontinuity has been extensively studied under low loading rate conditions, while the effect of impact loading on its shear strength was unclear. To address this issue, rock discontinuity samples with quantified surface roughness were tested under six normal stresses (0%, 5%, 10%, 15%, 20%, and 25% of its uniaxial compressive strength) and different loading rates (varying from 100 MPa/ms to 700 MPa/ms) by a novel-designed impact shear testing system. Experimental results show that the impact shear strength is proportional to the loading rate and exhibits significant rate dependence. Moreover, the cohesion is clearly rate-dependent and the friction angle keeps constant during impact loading, which shows obviously different behaviors with those under static loading conditions. Considering the rate effect of the shear strength parameters, the shear strength criterion of rough rock discontinuity under impact loading was established. Furthermore, a statistical constitutive model was proposed by incorporating the Weibull distribution of the shear damage. The successful application of the theoretical model to the experimental data shows that the proposed models can well predict the shear strength and describe the shear damage of rough rock discontinuities under impact loading.

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Section: Impact Shear Testsmentioning

confidence: 99%

Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling

Wang

et al. 2022

Lithosphere

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“…There is an assumption that the CPB sample is composed of many micro-units. The strength (F) of the micro-unit inside the CPB sample is a random variable and satisfies the Weibull distribution function, whose probability density function P(F) can be formulated by [35,36]:…”

Section: Stress-strain Constitutive Model and Its Illustrative Examplesmentioning

confidence: 99%

An analytical model for the triaxial compressive Stress-strain relationships of Cemented Pasted Backfill (CPB) with different curing time

Xiu

Wang

et al. 2021

Construction and Building Materials

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“…7,8 The slip and shear deformation of rock discontinuity significantly affect the structural safety of the rock mass. 2,9,10 It is now recognized that multiple factors affect the shear deformation behavior, including shear rate, shear plane shape and normal stress. 10 However, it should be noted that the deformation behavior of traditional direct shear is due to static load.…”

Section: Introductionmentioning

confidence: 99%

“…2,9,10 It is now recognized that multiple factors affect the shear deformation behavior, including shear rate, shear plane shape and normal stress. 10 However, it should be noted that the deformation behavior of traditional direct shear is due to static load. The rock discontinuity deformation may be caused by dynamic loads such as earthquakes, rock drilling and rock blasting.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of slip characteristics and contact area evolution of rough rock discontinuity under impact shear load

Fan,

Li,

et al. 2023

Num Anal Meth Geomechanics

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This study investigated theshear slip behavior and contact area evolution of rough rock discontinuities with impact shear load. First, the dynamic impact shear numerical simulation of rock samples with real rough rock discontinuities was carried out. Subsequently, the variety rule of slip displacement and velocity of rock discontinuity with impact velocity, confining stress and joint roughness coefficient (JRC) was studied. The variation in contact area and shear stress of rock discontinuity during shear was assessed. Finally, the effect of frictional force on the slip displacement and velocity and the effect of contact area and frictional force on the shear stress distribution were analyzed. The results showed that the slip displacement, velocity and shear stress are rate dependent. The slip displacement and velocity increase as the impact velocity increases and decrease as the confining stress and JRC increase. The contact area and shear stress distribution range of rock discontinuities decrease slightly as the impact velocity increases but increase significantly as the confining stress and JRC increase. The shear stress distribution range of rock discontinuities closely correlates with the contact area. The shear stress in the non‐contact area is zero. The shear stress distribution range increases as the contact area increases. The average shear stress increases as the frictional force increases. Moreover, the slip displacement and velocity of rock discontinuities decrease linearly as the frictional force increases.

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Slip behavior of rough rock discontinuity under high velocity impact: Experiments and models

Cited by 29 publications

References 40 publications

Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling

Shear Response of Rough Rock Discontinuities Subjected to Impact Loading: Experimental Study and Theoretical Modelling

An analytical model for the triaxial compressive Stress-strain relationships of Cemented Pasted Backfill (CPB) with different curing time

Investigation of slip characteristics and contact area evolution of rough rock discontinuity under impact shear load

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