Analysis of the Variation of Friction Coefficient of Sandstone Joint in Sliding

Zhao, Guochao; Wang, Laigui; Zhao, Na; Yang, Jianhua; Li, Xilin

doi:10.1155/2020/8863960

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…Therefore, γðtÞ = 1. Accordingly, the expression for DðtÞ can be obtained by substituting Equations ( 16)- (18) into Equation (15).…”

Section: Geofluidsmentioning

confidence: 99%

“…Zhou et al [13] and Song et al [14] summarized the displacement response law and stress wave propagation law of different parts of weak surface under blasting load. Zhao et al [15] combined theoretical analysis with the sandstone sliding friction test to propose a model to predict the friction coefficient of sandstone joint. The results showed that the larger the wear mass, the larger the friction coefficient in sliding, and the larger the wear area, the smaller the friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on Damage and Degradation of Structure Plane in Rock Mass under Cyclic Shear Load

et al. 2022

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By summarizing the generalized model of the structural plane in a rock mass under a cyclic shear load and influencing factors of dynamic mechanical properties of the structural plane, the mechanism of structural plane damage and degradation is discussed, and the evolution of damage to the structural plane is ascertained from cyclic shear tests by using structural planes with different undulating angles. Based on model tests and previous studies, nonlinear constitutive equations considering the effect of structural plane damage and degradation are presented. The effects of the initial undulating angle, amplitude of the cyclic shear load, and cycle times on the strength of the structural plane, as well as the degeneration process of structural plane stiffness under a cyclic shear load, are taken into consideration in the equations. The applicability of the above-mentioned constitutive equations is analyzed with a corresponding program compiled in the FISH language in the Universal Distinct Element Code (UDEC). The UDEC numerical simulation results are verified with ones from the model test. The achievements presented in this paper are of great significance to theoretical study of the mechanical behaviors of rock masses under cyclic shear loads and to project practice.

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“…Therefore, γðtÞ = 1. Accordingly, the expression for DðtÞ can be obtained by substituting Equations ( 16)- (18) into Equation (15).…”

Section: Geofluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study on Damage and Degradation of Structure Plane in Rock Mass under Cyclic Shear Load

et al. 2022

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“…Many scholars have carried out research to study the influence of different factors on the shear characteristics of jointed rock mass, including joint inclination [1], joint roughness [2,3], rock bridge [4,5], shear rate [6], normal stress [7], friction coefficients [8], and temperature [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of Joint Roughness and Infill Thickness on Shear Characteristics of Rock Mass

Zheng

Wang

et al. 2022

Advances in Civil Engineering

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The joint planes in fractured rock mass will reduce the tensile strength and shear strength of rock mass, which has a decisive influence on the deformation and failure mode of engineering rock mass. Furthermore, infill also exists between the joint surfaces, which will also affect the shear characteristics of the joint. A method of importing standard joint profile into PFC2D was proposed, and a series of numerical simulation tests were carried out to study the effect of joint roughness and infill thickness on the shear characteristics of joints. The numerical results revealed that rock bolts profoundly improved the shear strength of the infilled rock joints, enhanced the toughness of the joint surface, increased the number of micro-cracks, and made the dilatation more obvious. The shear stress and the normal displacement of unbolted or bolted infilled rock joints increased with increasing the joint roughness and decreasing the infill thickness. The maximum horizontal compression stress in the middle of the bolt gradually increased with the increase of joint roughness coefficient. Different roughness has different effects on the number of micro-cracks in the sample. The number of total cracks and tensile cracks of the bolted and unbolted specimens increased with the increase of joint roughness coefficient, while the shear cracks remained almost the same. Through the study of the coupling effect of joint roughness and infill thickness on peak shear stress, results can be obtained as follows. The unbolted samples are highly sensitive to JRC changes. The greater the infill thickness, the greater the sensitivity of unbolted samples to JRC changes. The reinforcement effect of the bolt will strengthen the meshing strength between the joint surface and the filling material; that is, the meshing strength is positively correlated with joint roughness and negatively correlated with filling thickness.

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A New 3D Statistical Parameter for Determining Roughness of Joint Surfaces Considering Shear Direction and Asperity Features

Liu,

Gao,

Xing

et al. 2023

KSCE Journal of Civil Engineering

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Analysis of the Variation of Friction Coefficient of Sandstone Joint in Sliding

Cited by 5 publications

References 24 publications

Experimental Study on Damage and Degradation of Structure Plane in Rock Mass under Cyclic Shear Load

Experimental Study on Damage and Degradation of Structure Plane in Rock Mass under Cyclic Shear Load

Effect of Joint Roughness and Infill Thickness on Shear Characteristics of Rock Mass

A New 3D Statistical Parameter for Determining Roughness of Joint Surfaces Considering Shear Direction and Asperity Features

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