柱面波在含节理岩体中传播的UDEC模拟

doi:10.13722/j.cnki.jrme.2018.1264

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摘要柱面波是岩体工程爆破中常见的波动形式之一，研究其传播规律对于岩体工程开挖及地下结构安全有重要意义。首先，采用离散元程序UDEC对柱面波在含线弹性节理岩体中的传播特性进行数值模拟研究。建模时通过在模型底部设置半圆柱状空腔实现柱面波的加载。之后，分别对无节理以及含单个节理的岩体中柱面波的传播进行模拟，并将数值结果与相应的理论结果进行对比，结果表明，UDEC能够准确有效地模拟柱面波在节理岩体中的传播。然后，分析节理刚度、入射波频率和监测点位置等因素对单节理岩体中柱面波透反射系数的影响规律。参数研究表明，监测点的位置变化会通过影响波的几何衰减和改变波的入射角度共同影响柱面波的传播特性；节理刚度在一定范围内会对透反射系数有显著影响，当刚度取值较大时影响较小，此时应力波主要以透射为主；频率影响分析再次印证了节理通低频、阻高频的特性。最后，对柱面波在一组节理中的传播特性进行研究，并且对影响波传播的因素展开分析。结果表明，节理间距和节理数量共同影响着波的传播特性。

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	柴少波
	赵均海
	王昊

关键词 ：岩石力学, 柱面波, 节理岩体, 波传播, 数值模拟, 透反射系数

Abstract：The cylindrical wave is one of the common wave types in rock mass blasting engineering and the cylindrical wave propagation is a great concern of rock mass excavation and underground structure safety. This paper presents a numerical study on cylindrical P-wave propagation across a jointed rock mass using UDEC. Firstly，a semicircular cylindrical cavity is established at the bottom of the model to simulate the cylindrical wave loading. Then，studies on cylindrical wave propagation across a rock mass without joint and with a single joint are conducted respectively. By compared with the theoretical results，UDEC is proved to be efficient to simulate cylindrical wave propagation across jointed rock mass. After that，parametric studies are carried out to investigate the influence of joint stiffness，the frequency of incident wave and the position of monitoring point on the transmission and reflection coefficients. The results show that the position of the monitoring point affects the transmission and reflection coefficients by influencing the geometric attenuation of the wave and changing the incident angle of the incident wave. Joint stiffness has a significant influence on the reflection coefficient within a certain range. The analysis of frequency effect verifies the characteristics of joint to filter high frequency waves. Finally，the character of cylindrical wave propagation across a set of joints is investigated. The results show that the transmission effect of the wave is corporately influenced by the joint spacing and the number of joints.

Key words： rock mechanics cylindrical wave jointed rock mass wave propagation numerical simulation transmission and reflection coefficients

引用本文:

柴少波，赵均海，王昊. 柱面波在含节理岩体中传播的UDEC模拟[J]. 岩石力学与工程学报, 2019, 38(S1): 2848-2856.
CHAI Shaobo，ZHAO Junhai，WANG Hao. UDEC simulation on cylindrical wave propagation through jointed rock masses. , 2019, 38(S1): 2848-2856.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.1264 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/2848

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