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为研究坡面位置、地震动参数对加速度动力响应的影响,通过振动台模型试验,分析不同坡型的边坡动力响应,揭示了坡面形态、高程及地震波类型、振动强度、地震频率对动力响应的影响。试验结果表明:边坡模态参数与高程无关,随白噪声逐级加载,模型体系的一阶自振频率逐渐降低,阻尼比逐渐增加;凹坡测点加速度放大系数略大于凸坡相应测点,凹坡较凸坡不稳定;地震荷载下“高程放大效应”受边坡地形条件及地震动参数的影响呈现不同特征,凹坡高程放大效应较凸坡显著;坡内、坡表各测点的加速度放大系数呈折线递增趋势,但坡表各测点的加速度放大系数始终大于坡内;坡体动力放大效应与边坡自振频率密切相关,一定范围内,频率越高,放大效应就越显著;振动强度对边坡沿高程方向动力响应分布影响不大,但对边坡加速度放大效应的影响较为明显。
In order to study the influence of slope position and ground motion parameters on acceleration dynamic response, the dynamic response of slope with different slopes is analyzed by shaking table model test. The slope shape, elevation, seismic wave type, vibration intensity, The impact of the response. The experimental results show that the modal parameters of the slope have nothing to do with the elevation. With the gradual loading of the white noise, the natural frequency of the first order mode of the model system gradually decreases and the damping ratio increases gradually. The acceleration amplification coefficient of the measuring point of the concave slope is slightly larger than that of the corresponding measuring point , And the concave slope is more unstable than the convex slope. The “elevation effect” under the earthquake load shows different characteristics under the influence of the slope topography and the ground motion parameters. The elevation effect of the concave slope is more significant than that of the convex slope. The accelerating magnification coefficient of measuring point shows a trend of increasing trend, but the accelerating magnification coefficient of each measuring point on slope table is always greater than that of slope. The power amplification effect of slope is closely related to the natural frequency of slope. Within a certain range, the higher the frequency, The more obvious the vibration effect is; the vibration intensity has little effect on the dynamic response distribution of the slope along the elevation direction, but it has obvious effect on the acceleration effect of the slope.