PROPAGATION CHARACTERISTICS OF CYLINDRICAL
WAVE IN JOINT ROCK MASSES
CHAI Shaobo，LI Jianchun，LI Haibo
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，
Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：The interaction between rock joints and cylindrical waves，which frequently occurs in mining and underground construction，is crucial in rock engineering. Based on the conservation of momentum at the wave fronts and the displacement discontinuity method，quantitative analysis of interaction between incidently cylindrical longitudinal-wave(P-wave) and a linear elastic rock joint is carried out. The wave propagation equation is accordingly deduced. Due to the geometrical spreading，reduction of the wave energy at the wave front is analyzed. For the normal impacting and oblique impacting of the incident wave，the transmission and reflection coefficients obtained from the derived wave propagation equation agree very well with the results from the existing method. Then parametric studies are carried out to investigate the effects of the wave source distance，the density of explosion and the incident waveforms on wave propagation across a jointed rock mass.
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2014, Vol. 33 
