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<p>The mechanical properties of weathered granite are significantly impaired in terms of strength and integrity, even though its overall structure remains recognizable. To investigate the effects of mineral composition and weathering degree on the uniaxial compressive behavior of weathered granite, discrete element modeling was performed using the Grain-Based Model (GBM), in conjunction with existing physical experiments. An improved <i>I</i><sub>p</sub> index was applied to characterize the degree of weathering. The weathered granite model was developed by weakening the contact parameters of certain particles within the GBM. The study examines how two factors—the degree of weathering and mineral content—affect the uniaxial compressive strength and crack propagation in weathered granite. The results indicate that: (1) The improved <i>I</i><sub>p</sub> index exhibits a strong correlation with uniaxial compressive strength, with strength decreasing as the <i>I</i><sub>p</sub> index decreases; (2) For a given mineral content, the proportion of weathering cracks increases rapidly with the degree of weathering, and cracks tend to bypass quartz crystals while completely enveloping feldspar and mica crystals; (3) For the same <i>I</i><sub>p</sub> index, the distribution of crack types in models with varying mineral contents shows similar trends, with changes primarily influencing the proportion of weathering cracks. In conclusion, the GBM simulations of weathered granite, along with the investigation of its uniaxial compressive properties and crack propagation, provide valuable insights into the influence of mineral content and weathering degree on the macroscopic mechanical behavior of granite.</p>

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Evolution of Uniaxial Compressive Properties of Weathered Granite with Varying Weathering and Mineral Content

  • 期刊论文

  • 发表日期：

    2025年6月29日

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  • Peng Lin,
  • Fumin Liu,
  • Ruiyang Ma,
  • Zhaoyang Wang,
  • Huihui Xie,
  • Jintao Kang

摘要

The mechanical properties of weathered granite are significantly impaired in terms of strength and integrity, even though its overall structure remains recognizable. To investigate the effects of mineral composition and weathering degree on the uniaxial compressive behavior of weathered granite, discrete element modeling was performed using the Grain-Based Model (GBM), in conjunction with existing physical experiments. An improved Ip index was applied to characterize the degree of weathering. The weathered granite model was developed by weakening the contact parameters of certain particles within the GBM. The study examines how two factors—the degree of weathering and mineral content—affect the uniaxial compressive strength and crack propagation in weathered granite. The results indicate that: (1) The improved Ip index exhibits a strong correlation with uniaxial compressive strength, with strength decreasing as the Ip index decreases; (2) For a given mineral content, the proportion of weathering cracks increases rapidly with the degree of weathering, and cracks tend to bypass quartz crystals while completely enveloping feldspar and mica crystals; (3) For the same Ip index, the distribution of crack types in models with varying mineral contents shows similar trends, with changes primarily influencing the proportion of weathering cracks. In conclusion, the GBM simulations of weathered granite, along with the investigation of its uniaxial compressive properties and crack propagation, provide valuable insights into the influence of mineral content and weathering degree on the macroscopic mechanical behavior of granite.