不同频率地震波作用下的土质边坡动力响应研究

运用有限差分软件FLAC2D,通过改变正弦波的频率,研究边坡的位移、加速度和速度的动力响应。结果表明:坡体对地震波加速度有放大作用,随着竖直高度的增加或至坡面距离的减小,放大效应愈加明显,且在坡顶处放大系数最大;在坡面中部,坡体对地震波速度有削弱作用,但在坡顶和坡脚处表现为放大作用,速度最大值位于坡脚处。边坡在地震波持续作用下位移增大,最大位移出现在坡脚处,当其达到临界状态时边坡失稳。当地震波频率逐渐增大,加速度峰值放大系数呈增大趋势,速度放大系数呈增大趋势,坡体位移呈减小趋势。

Study on Dynamic Response of Soil Slope under the Action of Seismic Waves in Different Frequency

The characteristics of rock-soil mass and seismic wave affect the earthquake dynamic response of slope. Herein with finite difference software FLAC2D the dynamic response of slope displacement, acceleration and velocity to the change of sinusoidal wave frequency was studied. It is found that, the slope mass plays the role of magnifying the acceleration of seismic wave and, as the vertical height increases or the distance away from the slope surface decreases, the magnification effect becomes more significant and the magnification coefficient at the slope top has the largest value; at the middle of slope surface, the slope mass plays the role of weakening the velocity of seismic wave, while magnifying at the top and foot, the velocity at the foot is maximum; the displacement of slope under the continuous action of seismic wave increases and the maximum displacement occurs at the foot and, when it reaches the critical state, the slope is instable; as the frequency of seismic wave increases gradually, both the peak acceleration amplification factor and the velocity amplification factor tend to increase, while the slope displacement tends to decrease.