【摘要】 为了验证有限—离散杂交元模拟岩石爆破结果的真实性、可靠性,对岩石爆破漏斗产生过程进行了数值模拟。采用联合单一与弥散裂纹模型实现从有限元模拟到离散元模拟的转化,应用等截面管道模型模拟爆破气体对裂缝的扩张作用。模拟结果表明:有限—离散杂交元能够模拟出岩石爆破中应力波的产生、传播及在自由面反射的整个过程,能够再现岩石破碎的产生、裂隙的扩展及碎石的抛掷过程。模拟出的岩石爆破的主要分区,即破碎区、裂隙区、和弹性区,与理论研究相符,监测点的应力时程曲线与文献中的结果具用相同特征。因此有限—离散杂交元能够模拟出爆破漏斗产生的整个动态过程,为岩石爆破理论的研究提供了新的手段。更多还原

【Abstract】 In order to calibrate the hybrid finite-discrete element method for modelling the rock fracture and fragmentation process by blast,the formation process of blasting crater in rock mass is simulated by the proposed method. The single and smeared crack mode is adopted in the hybrid finite-discrete element method for the transition from finite method modeling to the discrete element method modelling. A constant area duct mode is used to model the high-pressure gas flows through the fracturing rock. The modelled results indicate that the hybrid finite-discrete element method is able to simulate the stress propagation,crack initiation and propagation in rock mass. The modelled results also illustrates the crushed zone,cracked zone,elastic zone and the casting process of the fragments,which shows agreements with theoretical studies in literature. Additionally,the stress-time curves at the minor points show the same characters as those in the literatures. Therefore,it is concluded that the hybrid finite-discrete element method can model the entire formation process of the blasting crater in rock mass and the hybrid finite-discrete element method provides a new tool for studying the rock blast.更多还原