Stress Wave Propagation Across a Rock Mass with Two Non-parallel Joints

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• 作者：S. B. Chai ; J. C. Li ; Q. B. Zhang ; H. B. Li…
• 关键词：Non ; parallel joints ; Stress wave propagation ; Time ; domain analysis ; Transmission and reflection coefficients
• 刊名：Rock Mechanics and Rock Engineering
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：49
• 期：10
• 页码：4023-4032
• 全文大小：797 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Civil Engineering
  
• 出版者：Springer Wien
• ISSN：1434-453X
• 卷排序：49

文摘

A rock mass includes a number of joints, which govern the mechanical behavior of the rock mass and greatly affect stress wave propagation. Generally, joints do not parallel with each other, resulting in multiple wave reflections between joints and complex wave propagation process in rock masses. The present study presents an approach to analyze stress wave propagation through a rock mass with two non-parallel joints when the angle between the two joints is <10°. For incident P-wave impinging on this kind of rock mass, multiple reflections take place between the two joints. Meanwhile, transmitted waves are generated and propagate successively away from the joints. The mathematical expressions for P-wave propagation across the two joints are established in time domain by analyzing the wave field in the rock mass. By comparing with the result from numerical simulation, the new approach is proved to be effective to analyze wave propagation across two non-parallel joints, where the influence of joint tips on wave propagation is neglected. Parametric studies show that the joint stiffness, joint angle and frequency of incident wave have different effects on transmission and reflection coefficients.