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<p>To investigate how grain size and smooth interfaces affect tensile fracture in composite Brazilian rock samples, both experimental and numerical were conducted studies. The acoustic emission and digital image correlation techniques were applied to monitor deformation and micro-damage. In addition, a grain-based model was developed using PFC2D software to verify experimental findings at the micro-level. The main results and conclusions are as follows: (1) In experimental tests, when the stress curve of the composite samples finally drops, one side of rock will be completely cut off while the other remains tightly connected (unable to observe clear macroscopic cracks). (2) numerical simulations show that grain size does not significantly alter pre-failure stress concentration or deformation patterns, but it influences the roughness and inclination of the final macro-fracture surface. (3) The presence of a weak interlayer primarily modifies early-stage deformation behavior in adjacent rock zones, changing the stress state and subsequent crack propagation. (4) Grain size governs secondary crack development: in larger grains, cracks tend to propagate along weak boundaries, whereas in finer grains, cracks more often cut through the mineral grains.</p>

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Influence of weak interfaces on secondary crack development in crystalline rocks with varying strengths and grain sizes

  • 期刊论文

  • 发表日期：

    2026年1月8日

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  • Yusong Zhao,
  • Jiaqin Yan,
  • Siyu Chen,
  • Xuezhen Wu,
  • Shunchuan Wu,
  • Yi Long

摘要

To investigate how grain size and smooth interfaces affect tensile fracture in composite Brazilian rock samples, both experimental and numerical were conducted studies. The acoustic emission and digital image correlation techniques were applied to monitor deformation and micro-damage. In addition, a grain-based model was developed using PFC2D software to verify experimental findings at the micro-level. The main results and conclusions are as follows: (1) In experimental tests, when the stress curve of the composite samples finally drops, one side of rock will be completely cut off while the other remains tightly connected (unable to observe clear macroscopic cracks). (2) numerical simulations show that grain size does not significantly alter pre-failure stress concentration or deformation patterns, but it influences the roughness and inclination of the final macro-fracture surface. (3) The presence of a weak interlayer primarily modifies early-stage deformation behavior in adjacent rock zones, changing the stress state and subsequent crack propagation. (4) Grain size governs secondary crack development: in larger grains, cracks tend to propagate along weak boundaries, whereas in finer grains, cracks more often cut through the mineral grains.