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Abstract Impact of dynamic load on rock mass engineering is essentially a process that stress waves propagate in rock mass and interact with each other. Firstly，based on the geometric ray theory of elastic wave transmission，the component of stress wave field in rock slope is analyzed considering the effect of slope surface and top surface，when uniform planar simple harmonic P waves normally impinge from the bottom. The expression of amplified coefficient of particle vibration velocity in slope is derived by wave field superimposition. As a result，the mechanism of velocity amplification effect in homogeneous rock slope is revealed in this way. Then the key influential factors of the distribution of peak velocity are worked out. Research shows that P and SV stress waves pass the same particle have phase difference and would superimpose with each other in time delay as different transmission pathes and velocitis in slope，so the particle velocity amplification coefficient presents “rhythmical oscillation” when the slope height or frequency of incident wave exceeds a critical value according to the regularity of harmonic wave. Additionally，the critical slope height or critical frequency presents power function relationship with the elastic modulus of rock；meanwhile the relation between critical slope height and frequency or between critical frequency and slope height is negative power function.
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2015, Vol. 34 
