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<p>With the continuous increase in mining depth, the effects of groundwater and in-situ stress on rock mass strength have become key controlling factors in mining engineering. Through blasting experiments integrating CT (Computed Tomography), SEM (Scanning Electron Microscroscope), 3D reconstruction and fractal analysis, this study investigates water content effects and in-situ stress impacts on sandstone damage mechanisms. Comparative analysis of oven-dried (0%), natural (3.89%) and saturated (7.81%) specimens reveals non-monotonic damage evolution: decreasing from dry to natural states then increasing to saturation. The blasting damage in natural sandstone is significantly reduced under in-situ stress compared to the unstressed condition. Fracture morphology analysis demonstrates two competing water effects: weakening mechanisms (lubrication and cementation hydrolysis) dominate at high water content, while strengthening effects (Stefan adhesion and meniscus forces) peak then decline during intermediate water.</p>

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Experimental study on the effects of water content and in-situ stress on blasting damage characteristics and fracture modes of sandstone

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Chenxi Ding,
  • Xu Guo,
  • Xiao Guo,
  • Jiye Xu

摘要

With the continuous increase in mining depth, the effects of groundwater and in-situ stress on rock mass strength have become key controlling factors in mining engineering. Through blasting experiments integrating CT (Computed Tomography), SEM (Scanning Electron Microscroscope), 3D reconstruction and fractal analysis, this study investigates water content effects and in-situ stress impacts on sandstone damage mechanisms. Comparative analysis of oven-dried (0%), natural (3.89%) and saturated (7.81%) specimens reveals non-monotonic damage evolution: decreasing from dry to natural states then increasing to saturation. The blasting damage in natural sandstone is significantly reduced under in-situ stress compared to the unstressed condition. Fracture morphology analysis demonstrates two competing water effects: weakening mechanisms (lubrication and cementation hydrolysis) dominate at high water content, while strengthening effects (Stefan adhesion and meniscus forces) peak then decline during intermediate water.