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首页> 外文会议>12th International Conference on Analysis of Discontinuous Deformation >Dynamic response of rock mass during split Hopkinson pressure bar test:numerical simulation utilizing distinct element method
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Dynamic response of rock mass during split Hopkinson pressure bar test:numerical simulation utilizing distinct element method

机译：霍普金森压杆试验中岩体的动力响应：离散元数值模拟

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Dynamic responses of rock mass subject to high strain rate loadings by Split Hopkinson Pressure Bar(SHPB)tests were analyzed utilizing distinct element method in the present paper.In order to investigate the discontinuum of the rock mass,a numerical SHPB test model based on two-dimensional Particle Flow Code(PFC2D)was established.Two approaches with regular and random assemblies for incident and transmitted bars were compared to account for dispersion caused by inertial effect.Additionally,the relationships between strain rate and peak strength were studied and the rate-sensitive behaviors were analyzed.The distinct element method implemented in Particle Flow Code provides an effective approach to observe microcracks evolution,failure process and stress wave propagation; this model also can be extended to higher strain rate tests such as more than 103,104 and so on.Furthermore,the effects of joint parameters such as locations,directions,contact areas,as well as stiffness,are investigated and attempts are made to shed light on macroresponse with respect to discontinuum of rock mass,the results identify that the joints are closely related to failure modes,stress wave propagation and dynamic response of rock mass.
机译：本文采用离散元分析方法，通过Split Hopkinson压力棒（SHPB）试验对岩体在高应变速率荷载下的动力响应进行了分析。为了研究岩体的不连续性，建立了基于两种方法的SHPB数值试验模型。建立了二维粒子流代码（PFC2D）。比较了入射棒和透射棒的两种规则组装和随机组装的方法，以解决惯性效应引起的分散。此外，研究了应变率与峰值强度之间的关系，以及微粒流代码中实现的独特元素方法为观察微裂纹的发展，破坏过程和应力波的传播提供了一种有效的方法。该模型还可以扩展到更高的应变率测试，例如超过103,104等。此外，研究了诸如位置，方向，接触区域以及刚度之类的关节参数的影响，并尝试摆脱了困境。结果表明，节理与岩体的破坏模式，应力波传播和动力响应密切相关。

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