(1. School of Civil Engineering，Shaoxing University，Shaoxing，Zhejiang 312000，China；2. Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province，Shaoxing University，Shaoxing，Zhejiang 312000，China；3. State Key Laboratory for Tunnel Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China)
Abstract：Mineral composition is an important factor affecting the macro-micro friction mechanical properties of rock. The macro-micro friction properties of sandstone are studied based on direct shear and nano-scratch tests，the variations of mineral compositions before and after shearing are analyzed using X-ray diffraction，the macro-micro friction coefficients of the rock，different minerals and their interfaces are statistically obtained，and the friction correlation mechanism between these factors is established. The results show that the proportion of hard-phase minerals in the total amount of powder increases after shearing，the proportion of soft-phase minerals decreases. The scratch depth and friction force of hard-phase minerals remain stable，those of soft-phase minerals vary significantly. Statistical analysis of the frequency distribution curve of the friction coefficient reveals that each mineral and interface exhibit a single-peak Gaussian distribution. Combined with the analysis of macro-micro friction mechanisms，it is found that the macro friction force of sandstone is influenced by surface asperities and the wear between different minerals，the friction force of hard-phase minerals primarily depends on their inherent properties，the friction force of soft-phase minerals and interfaces is affected by their inherent properties，plastic flow and the extrusion of surrounding minerals. By further quantifying the relationship between macro-micro friction coefficients，the hard-soft phase interface is found to contribute the most to the macro friction coefficient，accounting for 52.1%. The research results of the macro-micro friction properties can provide a theoretical foundation for revealing the mechanism of cross-scale friction mechanics.
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2025, Vol. 44 
