STUDY OF DYNAMIC RESPONSE CHARACTERS AND FAILURE MECHANISM OF ROCK SLOPE UNDER EARTHQUAKE
STUDY OF DYNAMIC RESPONSE CHARACTERS AND FAILURE MECHANISM OF ROCK SLOPE UNDER EARTHQUAKE
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发表时间：
2012
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通讯作者：
Qi Shengwen
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作者：
Qi Shengwen
为研究汶川地震诱发岩质边坡的动力响应特征和破坏机理，进行了大型振动台试验，主要输入不同频率、幅值和持续时间的正弦波，试验结果表明：加速度放大系数随海拔高度的增加呈非线性增加，水平加速度在坡顶处比垂直加速度放大更明显加速度放大系数随地震频率的增加而非线性增大;坡体内加速度的分布随频率的变化而变化，当输入频率接近模型边坡的固有频率时，边坡的动力特性受地震波持续时间的影响较小，边坡结构控制着边坡的变形模式，边坡的动力特性受地震波持续时间的影响较小，边坡的动力特性受地震波持续时间的影响较小，边坡的动力特性受地震波持续时间的影响较小，边坡的动力特性受地震波持续时间的影响较小。顺层边坡的加速度放大系数比均质边坡高15%左右，这是由于顺层边坡中存在大量的结构面，使地震波的传播更加复杂。
Large-scale shaking table test was performed to study dynamic response characters and failure mechanism of rock slopes triggered by Wenchuan earthquake.Sine waves with different frequencies,amplitudes and duration times were mainly input.Testing results show that:acceleration amplification coefficients increased nonlinearly with the increasing elevation,and they almost reach to maximum at slope surface and shoulder.Horizontal acceleration is amplified more obvious than vertical acceleration at top part of slope(above three-quarters of slope height) which is the opposite at the lower part.Acceleration amplification coefficients increased with the increasing seismic frequency nonlinearly;distribution of acceleration in slope body changed with variation of frequency.Once the input frequency approximated to the natural frequency of model slope,dynamic acceleration is amplified most obviously.Acceleration amplification coefficients increased with the increment of seismic wave amplitude;but amplitude doesn t change the distribution of acceleration in slope body.Duration time of seismic wave has little influence on dynamic characters.Slope structure controls the deformation modes of rock slope;and acceleration amplification coefficients of bedding slope are about 15% more than those of the homogeneous slope,because of a large amount of structural surfaces in bedding slope which can make propagation of seismic wave more complex.