3DEC modeling on effect of joints and interlayer on wave propagation
WANG Wei-hua(王卫华), LI Xi-bing(李夕兵), ZUO Yu-jun(左宇军),
ZHOU Zi-long(周子龙), HANG Yi-ping(张义平) Z
School of Resources and Safety Engineering, Cetral South University, Changsha 410083, China n
Received 5 July 2005; accepted 30 September 2005
Abstract: Firstly, studies on propagation of one-dimensional normally incident wave in rock mass containing no joint, a single joint
and two parallel joints were conducted by Three Dimensional Distinct Element Codes(3DEC). By comparison of the modeling
results with the theoretical solutions, it has been found that a good agreement between them has been achieved. It is verified that the
3DEC is capable of modeling wave propagation in rock masses. Secondly, propagation of normally incident P-wave across two
parallel joints was studied. The modeling results show that transmission coefficient increases with the increasing ratio of joint
spacing to wavelength at first, then decreases with the increasing ratio of joint spacing to wavelength, lastly keeps constant. Finally,
effect of interlayer on wave propagation is investigated. It is shown that interlayer results in marked attenuation and leading phase,
and that attenuation increases with the increasing frequency and the increasing thickness of interlayer.
Key words: three dimensional distinct element codes (3DEC) modeling; wave propagation; joint; interlayer
1 Introduction
Natural rock mass is not homogeneous, and it is full
of various weak planes with different structures and
different geological mechanisms, such as fractures, joints,
and cracks. These structural weak planes seriously hinder
and affect the propagation of stress waves in rock mass.
Therefore, many efforts have been made to study the
effect of rock joints on wave propagation theoretically
and experimentally[1 10].

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