【摘要】 边坡的动力响应特性分析是研究动力条件下边坡失稳机制的前提。基于反倾层状岩质边坡振动台模型试验构建数值计算模型,利用校准后的数值模型研究地震动强度、频率、持时等对反倾层状岩质边坡动力响应特征的影响。结果表明:边坡内部及坡体表面的地面运动峰值加速度PGA(Peak Ground Acceleration)放大系数在竖直方向上都随边坡高度的增加呈非线性增长趋势;PGA放大系数的大小和分布受地震动参数影响显著,其中地震动频率对PGA放大系数影响最大,震动强度次之,持时影响最小。更多还原

【Abstract】 The analysis of dynamic response characteristics of slopes is the premise for studying the mechanism of slope instability under dynamic conditions. Based on the shaking table model test of anti-dip layered rock slope, a numerical calculation model was constructed. The effects of ground motion intensity, frequency and duration on the dynamic response characteristics of anti-dip layered rock slopes are studied by using the calibrated numerical model. The results show that the PGA amplification factor of the ground motion inside and on the surface of the slope increases nonlinearly with the increase of slope height in the vertical direction. The magnitude and distribution of the PGA amplification factor are significantly affected by the ground motion parameters, among which the ground motion frequency has the greatest influence on PGA amplification factor, followed by vibration intensity and the duration is the least.更多还原