预应力锚索支护边坡地震作用下动力响应研究

利用FLAC3D软件建立一个预应力锚索支护边坡模型,研究地震作用下边坡动力响应。结果表明:锚索预应力在地震开始时刻的瞬时损失百分比对锚索竖向位置敏感性高,而对波型、峰值加速度大小敏感性不明显。通过对比预应力锚索支护边坡震后水平位移与没支护情况水平位移的比值大小,分析预应力锚索在各种地震波作用下的支护效果。结果表明:震动波形、峰值加速度大小、初始张拉预应力大小、锚索间距都对支护效果影响很大。研究结果为预应力锚索支护的抗震优化设计提供参考。

Analysis on Dynamic Performance of Slope Supported with Prestressed Anchorage Cable under Earthquake

By using the FLAC3d software to establish a model of slope supported with prestressed anchorage cable and study on dynamic response of the slope under earthquake,the result indicates that: instantaneous percentage losses of pretension force is highly sensitive to vertical position of cable but the wave-shaped size and the value of peak acceleration take little impact on it.Through comparison of the horizontal displacement ratio of the slope supported with prestressed anchorage cable to the unsupported one,the supporting effect of prestressed anchorage cable under earthquake is analyzed.The results show: the wave size,value of peak acceleration and initial pretension force,the space between anchorage cable have great impact on the anti-seismic performance of anchorage cable.Research results provide reference for optimization of anti-seismic design of prestressed anchorage cable support.