EFFECT OF STRUCTURAL PLANE ON DYNAMIC RESPONSE OF ROCK SLOPES WITH HORIZONTAL STRAT

Based on the rule of stress wave propagation,the characters of the stress waves propagating in rock slopes with horizontal strata layers are analyzed.A new model about the stress waves propagating in this type of slopes is proposed.The effect of structural plane in dynamic responses of the slopes under periodical compressive load is examined with UDEC.It is revealed that the structural plane plays an important role.Under the action of low frequency compressive waves,the vertical peak ground velocity of slope crest (near sloping surface)is also larger than that of a homogeneous slope at the same position.This effect is more obvious as the slope height increases.Under the action of high frequency compressive waves,the vertical peak ground velocity of slope crest is larger than that of a homogeneous slope at the same position.However,it is less than that of a homogenous slope at positions far away from the sloping surfaces.And the value of the vertical peak ground velocity varies in period from model right to left.The numerical results are conductive to reveal the characteristics of fatigue behavior and failure mechanisms of different kinds of rock slopes.