| 摘要: |
| 为研究应力波在含充填节理岩体空间中的传播特性，采用离散元软件探讨不同产状节理对P波的透、反射规律的影响。首先，建立三维节理岩杆的计算模型，合理选用透射边界和Rayleigh阻尼；然后，将所得计算结果与等效波阻抗理论解相比较，以验证模型的合理性；最后，分别考虑不同节理角度、厚度、间距、数目及入射波频率下的P波透、反射系数变化特征。结果表明：在β为0~60°时，透射系数随节理倾向方位角β的增大而减小，而在β为60~90°时随β的增大而增大；透射系数随入射波频率的增大而减小，反射系数反之。若定义节理间距与厚度的正比关系，则透射系数随节理间距的增加而增加，反射系数反之；此外，根据不同节理厚度下的节理数目与透(反)射系数关系曲线特征，定义图线中的包络线为临界透(反)射曲线，则在给定节理数目时，其透(反)射系数总大(小)于临界透(反)曲线上对应的透(反)射系数数值。 |
| 关键词: 充填节理 P波 透射系数 反射系数 3DEC |
| DOI： |
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| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| Three-dimensional discrete element simulation of stress wave propagation in jointed rock mass with filling joint |
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ding ying xun, wang zhi liang, huang you peng
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Hefei University of Technology
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| Abstract: |
| In order to study the propagation characteristics of stress wave in rock mass with filling joints, the 3d Dimension Distinct Element Code was used to explore the influence of different occurrence joints on the penetration and reflection rules of P wave. First, the computational model of three-dimensional jointed rock rods is established, and the transmission boundary and Rayleigh damping are reasonably selected. Then, the calculated results are compared with the theoretical solutions of equivalent wave impedance to verify the rationality of the model. Finally, the variation characteristics of P wave transmission and reflection coefficient at different joint angles, thicknesses, spacing, Numbers and incident wave frequencies are considered. Results show that in 0~60 °, the transmission coefficient decreases with the increase of the joint inclination azimuth beta, in 60~90 ° with the increasing of beta. The transmission coefficient decreases with the increase of the incident wave frequency, while the reflection coefficient decreases. If the proportional relation between joint spacing and thickness is defined, the transmission coefficient increases with the increase of joint spacing, while the reflection coefficient decreases. In addition, according to the number of joints under different thickness of the joint and transmission (reflection) shot coefficient curve characteristics, define its envelope for critical transmission (reflection) curve. Then, when the number of joints is given, the total number of its reflection coefficient is large (small) on the critical reflection curve. |
| Key words: filling joint P wave transmission coefficient reflection coefficient 3DEC |
