偏心不耦合装药爆破损伤分布特征研究

Study on Blasting Damage Distribution Characteristics of Eccentric Uncoupled Charge

为了减小地下工程开挖中存在的损伤偏心效应,本文基于LS-DYNA软件,采用RHT模型,研究了炸药位置与不耦合系数对岩体爆炸损伤分布的影响规律,结合爆炸压力时程曲线分析应力波对炮孔壁的作用。结果表明:与同心不耦合装药结构相比,偏心不耦合装药改变了炮孔周围岩体的损伤分布,耦合侧出现明显的破碎区,同时也抑制了径向裂纹的扩展,不耦合侧出现应力波叠加效应,径向裂纹发育较为充分。随着不耦合系数的增加,耦合侧损伤更加明显,逐渐占据主导地位。该研究揭示了偏心不耦合装药结构应力波作用机理,对工程中降低围岩损伤破坏具有一定的参考价值。

In order to reduce the damage eccentricity effect in underground engineering excavation,based on LS-DYNA software and the RHT model,the effects of explosive position and the uncoupling coefficient on rock mass explosion damage distribution are studied,and the effect of stress wave on the hole wall was analyzed by combining the explosion pressure time history curve.The results indicate that the eccentric uncoupled charge alters the distribution of rock mass damage around the blasthole compared to the concentric uncoupled charge structure.Additionally,the fracture zone is significantly noticeable on the coupled side,thus hindering the propagation of radial cracks.In contrast,the stress wave superposition effect appears on the uncoupled side,enabling more extensive development of radial cracks.As the uncoupling coefficient increases,the damage to the coupling side becomes increasingly evident,eventually taking on a dominant role.The study reveals the mechanics of stress wave action in an eccentric uncoupled charge structure,providing valuable insights for reducing damage and failure in surrounding rock engineering.