Shearing Characteristics of Mortar–Rock Binary Medium Interfaces with Different Roughness

Zhao, Yanlin; Zhang, Minzhen; Tang, Wenyu; Chen, Yifan

doi:10.3390/app13158930

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Shearing Characteristics of Mortar–Rock Binary Medium Interfaces with Different Roughness

¹

School of Resources, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

²

School of Resources & Safety Engineering, Central South University, Changsha 410083, China

^*

Author to whom correspondence should be addressed.

Appl. Sci. 2023, 13(15), 8930; https://doi.org/10.3390/app13158930

Submission received: 6 June 2023 / Revised: 25 June 2023 / Accepted: 31 July 2023 / Published: 3 August 2023

(This article belongs to the Special Issue Advances in Failure Behavior of Rocks)

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Abstract

This study focuses on the crucial role of the shear characteristics of the mortar–rock interface (MRI) in geotechnical engineering. These properties largely determine the effectiveness of engineering reinforcement measures such as anchoring and grouting. The mechanical and deformation properties of the MRI with different roughness characteristics will be investigated. To achieve this, an indoor direct shear test was conducted on the mortar–rock binary medium (MRBM). The interface was numerically modeled from the test data using finite difference fractional value software. Direct shear simulation of the MRI by changing the normal stress (σ_n) and the sawtooth angle (α) was carried out. The results showed that as the normal stress and sawtooth angle increased, the shear stiffness of the MRI also increased. The shear stiffness was found to have a linear relationship with both the normal stress and the sawtooth angle. The peak shear displacement was identified as an indirect indicator of the shear failure mode of the binary medium interface (BMI). Quantitative relationships between the shear strength (τ), cohesion (c), angle of internal friction (ϕ), residual shear strength (τ_r), residual angle of internal friction (ϕ_r ), and degradation rate of the shear strength of the BMI were established based on the two influencing factors. Additionally, the study investigates how the sawtooth angle and the normal stress affect the variation in the normal displacement during direct shear testing of the MRBM. The findings revealed a correlation between the peak dilation angle of the BMI and the normal stress and sawtooth angle.

Keywords: mortar–rock binary medium interface; sawtooth angle; direct shear test; numerical simulation

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MDPI and ACS Style

Zhao, Y.; Zhang, M.; Tang, W.; Chen, Y. Shearing Characteristics of Mortar–Rock Binary Medium Interfaces with Different Roughness. Appl. Sci. 2023, 13, 8930. https://doi.org/10.3390/app13158930

AMA Style

Zhao Y, Zhang M, Tang W, Chen Y. Shearing Characteristics of Mortar–Rock Binary Medium Interfaces with Different Roughness. Applied Sciences. 2023; 13(15):8930. https://doi.org/10.3390/app13158930

Chicago/Turabian Style

Zhao, Yanlin, Minzhen Zhang, Wenyu Tang, and Yifan Chen. 2023. "Shearing Characteristics of Mortar–Rock Binary Medium Interfaces with Different Roughness" Applied Sciences 13, no. 15: 8930. https://doi.org/10.3390/app13158930

APA Style

Zhao, Y., Zhang, M., Tang, W., & Chen, Y. (2023). Shearing Characteristics of Mortar–Rock Binary Medium Interfaces with Different Roughness. Applied Sciences, 13(15), 8930. https://doi.org/10.3390/app13158930

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Shearing Characteristics of Mortar–Rock Binary Medium Interfaces with Different Roughness

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