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薄英鋆, 王华宁, 蒋明镜. 深部节理岩体开挖卸荷动力破坏机制的离散元研究[J]. 岩土工程学报, 2020, 42(S2): 196-201. DOI: 10.11779/CJGE2020S2035
引用本文: 薄英鋆, 王华宁, 蒋明镜. 深部节理岩体开挖卸荷动力破坏机制的离散元研究[J]. 岩土工程学报, 2020, 42(S2): 196-201. DOI: 10.11779/CJGE2020S2035
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

深部节理岩体开挖卸荷动力破坏机制的离散元研究

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

  • 摘要: 对于高地应力下的岩体开挖,岩体自身的缺陷以及开挖诱发的动力效应对围岩的破坏有十分重要的影响。对节理的分布进行简化与量化,采用二维离散元方法模拟了断续节理岩体中隧道开挖过程,研究不同连通率下岩体的宏观与微观动力破坏模式,以及节理面附近点处的动力响应。结果表明考虑动力效应后,岩体破坏范围以及程度显著增大;高连通率下动力计算模式更容易产生翼型裂纹的聚合;节理面的存在放大了岩桥中心的动力效应,并对节理面后的岩体起到缓冲作用,但是节理面之前的岩体将会受到反射应力波的影响。

     

    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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