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首页> 外文期刊>Rock Mechanics and Rock Engineering >Numerical Simulation of P-Wave Propagation in Rock Mass with Granular Material-Filled Fractures Using Hybrid Continuum-Discrete Element Method
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Numerical Simulation of P-Wave Propagation in Rock Mass with Granular Material-Filled Fractures Using Hybrid Continuum-Discrete Element Method

机译：混合连续离散元法数值模拟颗粒状充填裂隙岩体中的P波传播

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摘要

In this paper, a cohesive fracture model is applied to model P-wave propagation through fractured rock mass using hybrid continuum-discrete element method, i.e. Universal Distinct Element Code (UDEC). First, a cohesive fracture model together with the background of UDEC is presented. The cohesive fracture model considers progressive failure of rock fracture rather than an abrupt damage through simultaneously taking into account the elastic, plastic and damage mechanisms as well as a modified failure function. Then, a series of laboratory tests from the literature on P-wave propagation through rock mass containing single fracture and two parallel fractures are introduced and the numerical models used to simulate these laboratory tests are described. After that, all the laboratory tests are simulated and presented. The results show that the proposed model, particularly the cohesive fracture model, can capture very well the wave propagation characteristics in rock mass with non-welded and welded fractures with and without filling materials. In the meantime, in order to identify the significance of fracture on wave propagation, filling materials with different particle sizes and the fracture thickness are discussed. Both factors are found to be crucial for wave attenuation. The simulations also show that the frequency of transmission wave is lowered after propagating through fractures. In addition, the developed numerical scheme is applied to two-dimensional wave propagation in the rock mass.
机译：在本文中，采用内聚破裂模型，使用通用连续离散元方法，即通用离散元代码（UDEC），对通过裂隙岩体的P波传播进行建模。首先，提出了内聚断裂模型以及UDEC的背景。内聚破裂模型通过同时考虑弹性，塑性和破坏机制以及修改后的破坏函数，来考虑岩石破裂的渐进破坏而不是突然破坏。然后，从文献中进行了一系列关于通过P波传播通过包含单个裂缝和两个平行裂缝的岩体的实验室测试，并描述了用于模拟这些实验室测试的数值模型。在那之后，所有的实验室测试都被模拟并呈现出来。结果表明，所提出的模型，特别是内聚裂缝模型，可以很好地捕获具有填充和不填充材料的非焊接和焊接裂缝的岩体中的波传播特征。同时，为了确定裂缝对波传播的重要性，讨论了不同粒径和裂缝厚度的填充材料。发现这两个因素对于波衰减至关重要。仿真还表明，裂缝传播后，传输波的频率降低。另外，将开发的数值方案应用于岩体中二维波的传播。

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