A Study on the Mechanical Properties of Unbolted and Bolted Composite Rock Masses Under the Influence of Different Grain Sizes
Year: 2025
Type: article
Abstract: In order to explore the influence of grain size on the mechanical properties of unbolted and bolted composite rock masses, uniaxial compression tests were carried out on unbolted and bolted composite rock masses of different grain sizes. The characteristics of the variation in the strength, elastic modulus, Poisson’s ratio and energy parameters of composite rock masses with grain size were analyzed. The evolution process of crack propagation in the composite rock masses was studied, and the influence mechanism of rock grain size on the mechanical properties of the anchorage bearing structure of the rock surrounding the roadway was revealed. The results show that with an increase in the grain size, the peak strength and elastic modulus of a composite rock mass decrease gradually, and the post-peak residual strength, Poisson’s ratio and total input strain energy increase gradually. The evolution of crack propagation is from tensile cracking to tensile to shear mixed to shear cracking. Prestressed anchor bolts can effectively improve the peak strength and post-peak residual strength of composite rock masses and have inhibitory effects on crack propagation in the anchorage zone, such as weakening, deflection and crack arrest. Compared with an unbolted composite rock mass, the bearing capacity of a bolted composite rock mass is stronger, and its elastic modulus is significantly improved.
Source: Fractal and Fractional
Authors: Chao Yuan, Xuanqi Huang, Weijun Wan, Yueyang Xu
Institution: Hunan University of Science and Technology
Language: English
Topic: Rock Mechanics and Modeling
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,258
OpenAlex ID: W4409227877