震动强度对反倾层状岩质边坡动力响应规律的影响

通过振动台模型试验探讨震动强度对反倾层状岩质边坡动力响应规律的影响,着重分析边坡加速度响应峰值、加速度放大系数随震动强度增加的变化规律。结果表明:①随着震动强度增加,模型边坡各测点的加速度响应峰值不断增大,地震波频率和测点位置影响加速度响应峰值的增加方式;②震动强度对模型边坡各测点加速度放大系数的影响因地震波频率、测点位置的不同而有不同的表现。同一频率地震波作用下,相同高程的测点加速度放大系数随震动强度增加的变化规律相同;③0.20g是边坡变形破坏的临界加速度值;④震动强度的变化并不改变加速度响应峰值、加速度放大系数在边坡中的分布。该研究结果对高地震区的地质灾害防治具有指导和借鉴-意义。

Influence of Vibration Intensity on Dynamic Response of Rock Slope

The influence of vibration intensity on the dynamic response of anti-dip layered rock slope is studied by shaking table model test, the change laws of the peak acceleration response and its amplification factor of slope with the increasing vibration intensity are analyzed emphatically. The results show that: (1)As the vibration intensity increases, the peak acceleration response of the model slope increases, the frequency of seismic wave and the position of the measuring points both affect the way of increase of the peak acceleration response;(2)The influence of vibration intensity on the acceleration amplification factor of the model slope has different performance because of the frequency of seismic wave and the location of the measuring points. Under the action of the same frequency seismic wave, the change laws of the acceleration amplification factor of the measuring points with the same elevation with the increasing vibration intensity are alike;(3)0.20g is an important critical acceleration value that causes deformation of the model slope;(4)The change of vibration intensity does not change the distribution of the peak acceleration response and the acceleration amplification factor in the model slope. The research provides a guidance and reference to mitigate geo-hazards in the high seismic zones.