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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 4    August 2005

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Pilot studies on two dimensional wave propagation in rock masses
LEI Wei-dong(雷卫东)1,  M.H.Ashraf1,  ZHAO Jian(赵 坚)1,2

1. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798; 
2. College of Architecture and Civil Engineering, 
China University of Mining and Technology, Xuzhou 221008, China

Abstract: Pilot studies on two dimensional(2-D) wave propagation through single joint or multiple parallel joints were comprehensively conducted, using a suitable data processing method. The possible factors influencing the transmission ratio in 2-D wave propagation under certain circumstances in rock masses were studied. It is found that in the process of 2-D wave propagation, for any radial line, the amount, the stiffness and the spacing of the joints influence the transmission ratio; by contrast, the transmission ratio at any point is independent of the radial distance from the center of wave source. It is also found that the transmission ratio for every grid-point along a single circle can present the transmission ratio for every grid-point after a certain quantity of joints. For the special radian direction(normal to the joints), it is concluded that the transmission ratio is dominated by the normal stiffness; while the influence of shear stiffness is negligible. The radius of the tunnel or borehole for the source wave does not affect the transmission ratio in 2-D wave propagation.

 

Key words: 2-D wave; transmission ratio; stiffness of joint; wave propagation; pilot study  

ISSN 1672-7029
CN 43-1423/U

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