Experimental investigation on the anisotropy of friction property for dry and water-saturated rock

IF 6.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL Friction Pub Date : 2024-06-28 DOI:10.1007/s40544-024-0868-5
Qing Yang, Mingming He, Jinrui Zhao, Mingchen Ding, Jing Wang
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Abstract

Friction properties of rock are closely connected with the anisotropy. The anisotropy of rock friction can provide a valuable assessment for geotechnical and geological engineering. In this study, the rotary friction tests were conducted to analyze the water effect on the friction property and the friction anisotropy of the four types of rock. The drilling response model (DD-model) was employed to characterize the rotary friction behavior of the rocks. The parameters of this model include the three types of friction parameters: 1/ς, μ, and f, where 1/ς and μ are constant, and f is a variable. A quantitative method is proposed for assessing the anisotropy of rock friction. The results of the rotary friction tests indicate that the relation between torque force and thrust force conforms to the DD-model. The changes of two friction constants 1/ς and μ from dry state to water-saturated state suggest that the water effect on the friction strength of the rocks exhibits significant anisotropy. The friction strength determined by the friction variable f increases first, then decreases, and finally stabilizes with the increasing of depth. AIf is an anisotropy index calculated by the proposed method. The percentage difference of the average value of AIf between water-saturated and dry states shows the degree of the water effect on the friction anisotropy of the rocks, mudstone (MU) > granite (GR) > fine sandstone (FS) > argillaceous siltstone (AS). The quantitative model is hopefully constructed for characterizing the relation between the anisotropic friction strength of rock and the moisture state in future.

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干燥和水饱和岩石摩擦特性各向异性的实验研究
岩石的摩擦特性与各向异性密切相关。岩石摩擦的各向异性可以为岩土工程和地质工程提供有价值的评估。本研究通过旋转摩擦试验,分析了水对四种岩石的摩擦特性和摩擦各向异性的影响。采用钻孔响应模型(DD 模型)来描述岩石的旋转摩擦行为。该模型的参数包括三种摩擦参数:1/ς、μ 和 f,其中 1/ς 和 μ 为常数,f 为变量。提出了评估岩石摩擦各向异性的定量方法。旋转摩擦试验结果表明,扭矩力和推力之间的关系符合 DD 模型。两个摩擦常数 1/ς 和 μ 从干燥状态到水饱和状态的变化表明,水对岩石摩擦强度的影响表现出明显的各向异性。由摩擦变量 f 确定的摩擦强度随着深度的增加先增大后减小,最后趋于稳定。AIf 是由建议方法计算得出的各向异性指数。水饱和状态与干燥状态下 AIf 平均值之差的百分比显示了水对泥岩(MU)、花岗岩(GR)、细砂岩(FS)和砾质粉砂岩(AS)等岩石摩擦各向异性的影响程度。希望建立的定量模型能在未来表征岩石各向异性摩擦强度与水分状态之间的关系。
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来源期刊
Friction
Friction Engineering-Mechanical Engineering
CiteScore
12.90
自引率
13.20%
发文量
324
审稿时长
13 weeks
期刊介绍: Friction is a peer-reviewed international journal for the publication of theoretical and experimental research works related to the friction, lubrication and wear. Original, high quality research papers and review articles on all aspects of tribology are welcome, including, but are not limited to, a variety of topics, such as: Friction: Origin of friction, Friction theories, New phenomena of friction, Nano-friction, Ultra-low friction, Molecular friction, Ultra-high friction, Friction at high speed, Friction at high temperature or low temperature, Friction at solid/liquid interfaces, Bio-friction, Adhesion, etc. Lubrication: Superlubricity, Green lubricants, Nano-lubrication, Boundary lubrication, Thin film lubrication, Elastohydrodynamic lubrication, Mixed lubrication, New lubricants, New additives, Gas lubrication, Solid lubrication, etc. Wear: Wear materials, Wear mechanism, Wear models, Wear in severe conditions, Wear measurement, Wear monitoring, etc. Surface Engineering: Surface texturing, Molecular films, Surface coatings, Surface modification, Bionic surfaces, etc. Basic Sciences: Tribology system, Principles of tribology, Thermodynamics of tribo-systems, Micro-fluidics, Thermal stability of tribo-systems, etc. Friction is an open access journal. It is published quarterly by Tsinghua University Press and Springer, and sponsored by the State Key Laboratory of Tribology (TsinghuaUniversity) and the Tribology Institute of Chinese Mechanical Engineering Society.
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