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Mechanical Properties and DEM-Based Simulation of Double-Fractured Sandstone Under Cyclic Loading and Unloading

Author

Listed:
  • Lichen Sun

    (School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China)

  • Peijie Lou

    (School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
    State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou 221116, China)

  • Cheng Pan

    (School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China)

  • Penghui Ji

    (School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China)

Abstract

In response to the challenges posed by long-term cyclic loading and unloading in underground rock engineering, this study systematically investigates the macro- and meso-mechanical response mechanisms of fractured rock masses under cyclic loading conditions. We performed graded cyclic loading–unloading tests on parallel double-fractured sandstone samples with varying spatial distribution configurations. These tests were integrated with digital image correlation (DIC) technology, fractal dimension analysis, and discrete element method (DEM) numerical simulations to analyze the mechanical properties, deformation characteristics, crack propagation features, and meso-fracture mechanisms of the fractured rock masses. The findings indicate that the diverse spatial distribution characteristics of the double fractures exert a significant influence on the loading–unloading processes, surface deformation fields, and fracture states of the rock. Cyclic loading leads to an increase in the fractal dimension of the fractured samples, resulting in more intricate and chaotic crack propagation patterns. Furthermore, DEM simulations reveal the impact of fracture spatial configurations on the force chain distribution within the rock bridges. The equivalent stress nephogram effectively represents the stress field distribution. This offers valuable insights for predicting meso-fracture trends in rocks. This paper comprehensively integrates both experimental and numerical simulation methodologies to deliver a thorough analysis of the complex mechanical behavior of fractured rock masses under cyclic loading conditions, with direct relevance to engineering applications such as mine excavation and slope stabilization.

Suggested Citation

  • Lichen Sun & Peijie Lou & Cheng Pan & Penghui Ji, 2024. "Mechanical Properties and DEM-Based Simulation of Double-Fractured Sandstone Under Cyclic Loading and Unloading," Sustainability, MDPI, vol. 16(20), pages 1-21, October.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:20:p:9000-:d:1500961
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    References listed on IDEAS

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    1. Sui, Lili & Ju, Yang & Yang, Yongming & Yang, Yong & Li, Aishan, 2016. "A quantification method for shale fracability based on analytic hierarchy process," Energy, Elsevier, vol. 115(P1), pages 637-645.
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