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Open Access Research Article

Analysis of Rock Friction Coefficient Characteristics Based on Friction Experimental Equipment

by Zhipeng Hong 1,* ,  Wei Hao 1 ,  Liang He 1 ,  Yinuo Zhang 1  and  Zhaoyu Wen 1
1
Xi’an University of Technology
*
Author to whom correspondence should be addressed.
RML  2025 2(2):15; https://doi.org/10.70425/rml.202502.15
Received: 20 May 2025 / Accepted: 16 June 2025 / Published Online: 19 June 2025
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Abstract

Friction coefficient, as a parameter of mechanical state, plays a crucial role in the shear failure of rocks in the field of Earth sciences. This paper investigates the frictional characteristics and anisotropy of rock by analyzing the coefficient of variation of the friction coefficient (f) and the anisotropy index of rock friction coefficients Af. Rotational friction tests were conducted using cylindrical granite against square samples of granite, sandstone, and andesite in three directions to analyze the relationship between the friction coefficient and various drilling parameters. This study reveals the variations in the friction coefficient and notable changes in the friction coefficient’s anisotropy. The results indicate a correlation between the alignment of turning points during the frictional stage and the rock strength. During the experiment, the friction coefficient undergoes cyclic variation before gradually stabilizing. The anisotropy of rotational friction follows the order: granite > andesite > sandstone, suggesting that the higher rock strength corresponds to greater frictional anisotropy. The rotational friction control coefficient C is derived and linked to the rotational friction stage. The duration of effective contact between rock surfaces and directional cutting efficiency are the primary factors contributing to anisotropy. The results offer practical implications for drilling design and seismic risk assessment in anisotropic rock formations.

Keywords: Rock; friction coefficient; anisotropy index; rock strength; drilling parameters;
Copyright: © 2025 by Hong, Hao, He, Zhang and Wen. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) (Creative Commons Attribution 4.0 International License). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
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ACS Style
Hong, Z.; Hao, W.; He, L.; Zhang, Y.; Wen, Z. Analysis of Rock Friction Coefficient Characteristics Based on Friction Experimental Equipment. Rock Mechanics Letters, 2025, 2, 15. doi:10.70425/rml.202502.15
AMA Style
Hong Z, Hao W, He L et al.. Analysis of Rock Friction Coefficient Characteristics Based on Friction Experimental Equipment. Rock Mechanics Letters; 2025, 2(2):15. doi:10.70425/rml.202502.15
Chicago/Turabian Style
Hong, Zhipeng; Hao, Wei; He, Liang; Zhang, Yinuo; Wen, Zhaoyu 2025. "Analysis of Rock Friction Coefficient Characteristics Based on Friction Experimental Equipment" Rock Mechanics Letters 2, no.2:15. doi:10.70425/rml.202502.15
APA Style
Hong, Z., Hao, W., He, L., Zhang, Y., & Wen, Z. (2025). Analysis of Rock Friction Coefficient Characteristics Based on Friction Experimental Equipment. Rock Mechanics Letters, 2(2), 15. doi:10.70425/rml.202502.15

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