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July 31, 2026Scientific ReportsOpen Access

Failure analysis of coal–rock composites with different coal thicknesses under uniaxial loading based on resistivity response and damage evolution

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Authors

CTChenglin TianJLJiali LiuJLJianlei Liu

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Overview

Randomized trial investigates coal thickness effects on resistivity and failure in composites, suggesting implications for disaster prevention.

Key Points

  • The research aims to understand how variations in coal thickness affect the failure mechanisms and resistivity indicating damage in coal-rock composites under load.
  • Conductive coal–rock analogue materials were prepared with various thickness ratios for testing.
  • Specimens with rock-to-coal ratios of 1:1, 1:2, and 1:3 underwent uniaxial compression with resistivity monitoring.
  • PFC3D simulations analyzed crack evolution and damage accumulation.
  • Peak strength decreased from 18.73 MPa to 15.62 MPa as coal proportion increased.
  • Failure-stage resistivity increased by 1.27–1.33 times preceding stress drops.
  • A resistivity increment index identified the transition from stable crack growth to accelerated instability.

Cite This Study

Tian et al. (2026) studied this question.

synapsesocial.com/papers/6a6c4755747664a1aa73c81fhttps://doi.org/10.1038/s41598-026-64074-x
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Also Consider

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  1. 1Fracture characteristics and failure mechanisms of coal-rock composites under complex true triaxial stress paths2026
  2. 2Dynamic Progressive Failure and Energy-Driven Damage Evolution of Coal–Sandstone Composite Specimens Under Impact Loading: Coupling Effects of Component Ratio2026
  3. 3The Characteristic Strength and Damage Temporal and Spatial Evolution of the Combination Under the Coal Thickness Effect2026
  4. 4Strain Localization and Failure Evolution in Rock–Coal Composites Considering Interaction Mechanisms: A Theoretical and Experimental Investigation2026 · 3 citations
  5. 5Mechanical Behavior and Energy Evolution of Coal–Rock Composites Under Mining-Induced Stress2026