詹志发, 祁生文, 何乃武, 郑博文, 葛传峰. 2019: 强震作用下均质岩质边坡动力响应的振动台模型试验研究. 工程地质学报, 27(5): 946-954. DOI: 10.13544/j.cnki.jeg.2019168
    引用本文: 詹志发, 祁生文, 何乃武, 郑博文, 葛传峰. 2019: 强震作用下均质岩质边坡动力响应的振动台模型试验研究. 工程地质学报, 27(5): 946-954. DOI: 10.13544/j.cnki.jeg.2019168
    ZHAN Zhifa, QI Shengwen, HE Naiwu, ZHENG Bowen, GE Chuanfeng. 2019: SHAKING TABLE TEST STUDY OF HOMOGENEOUS ROCK SLOPE MODEL UNDER STRONG EARTHQUAKE. JOURNAL OF ENGINEERING GEOLOGY, 27(5): 946-954. DOI: 10.13544/j.cnki.jeg.2019168
    Citation: ZHAN Zhifa, QI Shengwen, HE Naiwu, ZHENG Bowen, GE Chuanfeng. 2019: SHAKING TABLE TEST STUDY OF HOMOGENEOUS ROCK SLOPE MODEL UNDER STRONG EARTHQUAKE. JOURNAL OF ENGINEERING GEOLOGY, 27(5): 946-954. DOI: 10.13544/j.cnki.jeg.2019168

    强震作用下均质岩质边坡动力响应的振动台模型试验研究

    SHAKING TABLE TEST STUDY OF HOMOGENEOUS ROCK SLOPE MODEL UNDER STRONG EARTHQUAKE

    • 摘要: 近年来我国地震灾害频发,强震诱发边坡失稳作为地震中最为常见的次生灾害,致使我国的地震滑坡灾害数量位居全世界之首,针对强震作用下岩质边坡动力响应问题,采用铁粉、重晶石粉、石英砂、石膏、水作为相似材料,开展了均质岩质边坡振动台试验。详细分析了均质边坡模型在不同频率和幅值地震波输入下的地震动响应特征,发现当频率较低时,沿坡表水平距离方向上监测点的水平加速度放大系数是单调增大的,坡肩处水平加速度放大系数达到最大值,当频率进一步增大接近或者超过模型自振频率时,边坡模型不再呈现出典型的放大现象;相同幅值不同频率加载条件下,均质边坡模型的自振频率变化整体不太明显,而输入加速度幅值的变化对自振频率的影响更为显著,低频成分对模型损伤不明显,高频及自振频率附近频段对均质边坡的损伤更为强烈,导致模型的自振频率显著下降。该问题的研究对强震作用下岩质边坡地震动响应及变形破坏机理研究具有一定的指导意义。

       

      Abstract: In recent years, earthquakes occur frequently in China. Slope instability induced by strong earthquakes are the most common secondary disasters, which makes the number of earthquake landslides in China ranks first in the world. For the dynamic response of rock slopes under strong earthquakes, this paper adopts iron powder, barite powder, quartz sand, gypsum and water as the similar materials and carries out the shaking table test of large homogeneous rock slope. The ground motion response characteristics of the homogeneous slope model under different frequencies and amplitudes of seismic wave input are analyzed in detail. It is found that when the frequency is low, the horizontal acceleration amplification factor of the monitoring point along the horizontal distance of the slope surface increases monotonously. The horizontal acceleration amplification factor at the shoulder reaches the maximum value. When the frequency further increases or exceeds the natural vibration frequency of the model, the slope model no longer exhibits a typical amplification phenomenon. Under the same amplitude and different frequency loading conditions, the variation of the natural frequency of the model is not obvious overall, and the change of the input acceleration amplitude has a more significant effect on the natural vibration frequency. The low frequency component is not obvious to the model damage. The high frequency and the natural vibration frequency are more obvious on the damage of the homogeneous slope, resulting in a significant decrease in the natural frequency of the model. The research of this problem has certain guiding significance for the study of ground motion response and deformation failure mechanism of rock slope under strong earthquakes.

       

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