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| Effect of normal stress on the shear leading edge of sandstone rock joint |
| HUANG Man1, 2, 3, XU Sheng1, 2, 3, WENG Hanqian4, HONG Chenjie1, 2, 3*, TAO Zhigang4, ZHANG He1, 2, 3 |
(1. State Key Laboratory of Intelligent Deep Metal Mining and Equipment, Shaoxing University, Shaoxing, Zhejiang 312000, China; 2. School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; 3. Zhejiang Key Laboratory of Rock Mechanics and Geohazards, Shaoxing University, Shaoxing, Zhejiang 312000, China; 4. State Key Laboratory of Tunnel Engineering,
China University of Mining and Technology (Beijing), Beijing 100083, China) |
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Abstract The closure behavior of rock joints significantly influences their shear mechanics. This study employs pressure-sensitive films to measure three groups of sandstone joints, discussing the relationship between effective contact characteristics and shear strength. The results indicate that: (1) Under identical normal stress, the effective contact area ratio varies with different shear directions. As normal stress increases, the effective contact area ratio exhibits a linear growth trend, ultimately reaching approximately 50% of the actual contact area ratio. (2) Variations in effective average contact stress also show significant differences across shear directions. Additionally, the rougher the joint surface, the more pronounced the fluctuations in effective average contact stress. Furthermore, the average effective dip angle decreases following a negative exponential trend as normal stress increases, gradually approaching a stable value indicative of a fully contacted state. (3) An effective roughness indicator, which accounts for the influence of normal stress, is modified based on the effective contact area ratio. Building on this, a new peak shear strength model for rock joints is developed using the Barton criterion. This model satisfies boundary condition constraints, and its accuracy in predicting the peak shear strength of rock joints has been validated through direct shear tests and comparisons with several published datasets. These findings provide a theoretical foundation for understanding the shear mechanisms of sandstone joints.
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2026, Vol. 45 
