边坡动力响应特性及破坏过程的振动台试验研究

以某护坡工程中的岩土边坡为原型,设计并制备了坡高1 m、坡角45°的模型边坡,通过输入不同振幅的人工波、随机波和白噪声激励,采用大型振动台动力模型试验研究了边坡的动力响应规律及已知滑动面条件下的边坡失稳滑动机理。试验结果表明,不管是坡体表面或内部,加速度放大系数均随高程增加呈放大效应,相同高程的边坡表面放大系数略高于坡体内部,且呈现出一定的趋表效应;随着地震波加速度幅值的增加,结构面开始出现张开、闭合、滑移的运动状态,进而产生较大的位移并发生失稳破坏。

Shaking Table Test Study on Dynamic Responses and Failure Mode of Slope

A shaking table test of slope with dynamic responses and failure mode was introduced. Taking rock-soil slope protection project as prototype, the model slope was built with height of 1.0 m and angle of 45°. A series of tests were performed with different amplitudes of artificial wave, random wave and white-noise excitation. The dynamic responses of slope under earthquake, as well as the failure mode of slope were discussed. The results show that acceleration amplification coefficient increases gradually along with increase of height in the surface and interior of slope; the amplification coefficient of surface slope is larger than that of interior under the same height; with the increase of acceleration amplitude of seismic wave, the motion state of structural plane began to open, closed, slip, and then appeared a larger displacement and led to instability failure.