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Joint parameters affect the mechanical properties of sandstone significantly. This paper investigates the influence of fracture on the mechanical properties of roof plate bedded sandstone in Yuanjue Cave by using the Discrete Fracture Network (DFN) model. The effects of joint density and dip on the mechanical behavior of bedded sandstone under triaxial compression are first examined. And, the fractal dimension is used to quantify the relationship between joint density and strength parameters. The results show that: (1) The compressive strength and elastic modulus of bedded sandstone decrease with increasing joint density. The compressive strength shows a ‘U’ distribution with increasing joint dip from 0° to 90°, while the elastic modulus increases gradually. (2) The bedded sandstone shows a very high anisotropic characteristic, and the weak plane of the layers influences the strength and deformation damage of the bedded structure. (3) The fractal dimension has a significant negative correlation with rock strength and elastic modulus, with correlation coefficients of 0.834 and 0.965.

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Numerical Simulation of the Effect of Joint Parameters on the Mechanical Behaviors of the Fractured Sandstone

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  • 出版模式：

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  • 发表日期：

    2025年

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  • Yue Zhang,
  • Miaoran Du,
  • Peijie Yin

摘要

Joint parameters affect the mechanical properties of sandstone significantly. This paper investigates the influence of fracture on the mechanical properties of roof plate bedded sandstone in Yuanjue Cave by using the Discrete Fracture Network (DFN) model. The effects of joint density and dip on the mechanical behavior of bedded sandstone under triaxial compression are first examined. And, the fractal dimension is used to quantify the relationship between joint density and strength parameters. The results show that: (1) The compressive strength and elastic modulus of bedded sandstone decrease with increasing joint density. The compressive strength shows a ‘U’ distribution with increasing joint dip from 0° to 90°, while the elastic modulus increases gradually. (2) The bedded sandstone shows a very high anisotropic characteristic, and the weak plane of the layers influences the strength and deformation damage of the bedded structure. (3) The fractal dimension has a significant negative correlation with rock strength and elastic modulus, with correlation coefficients of 0.834 and 0.965.