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Volume 42 Issue S2
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BO Ying-jun, WANG Hua-ning, JIANG Ming-jing. Cracking mechanism of deep jointed rock mass induced by transient excavation via DEM[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(S2): 196-201. DOI: 10.11779/CJGE2020S2035
Citation: BO Ying-jun, WANG Hua-ning, JIANG Ming-jing. Cracking mechanism of deep jointed rock mass induced by transient excavation via DEM[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(S2): 196-201. DOI: 10.11779/CJGE2020S2035
shu

Cracking mechanism of deep jointed rock mass induced by transient excavation via DEM

  • 1.

    Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China

  • 2.

    School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China

  • 3.

    Department of Civil Engineering, School of Civil Engineering, Tianjin University, Tianjin 300350, China

  • 4.

    State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China

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  • Received Date: August 06, 2020
  • Available Online: December 07, 2022
    Graphical Abstract
    • Abstract
  • For the excavation of rock mass under high stress, the defects of the rock mass and the dynamic effects induced by the excavation have a great impact on the damage of the surrounding rock. The distribution of joints is simplified and quantified. Based on the two-dimensional discrete element method, the process of excavation of rock masses with non-persistent joints is simulated. The macro-and micro-dynamic failure modes of the rock mass under different connectivity rates and the dynamic response near the joint are studied. The results show that after considering the dynamic effect, the range and degree of damage increase significantly. The dynamic model is more likely to produce wing crack coalescence under high connectivity. The joint amplifies the dynamic effect at the rock bridge center and acts as a cushion to absorb the shock behind the joint, but the rock mass before the joint will be affected by the reflected stress waves.
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    • References (18)
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