框架预应力锚杆加固多级高边坡地震响应数值分析

依托实际工程,基于Geostudio岩土分析软件,建立了框架预应力锚杆加固多级高边坡的动力分析模型。通过设置边界条件,输入水平地震作用,分析了边坡在地震作用下的位移响应、速度响应、加速度响应和锚杆轴力响应。结果表明:水平地震作用下,边坡内的位移、速度、加速度和锚杆的轴力等均随地震持时呈波动性变化。水平位移随时间变化显著且具有累积效应,边坡水平位移远大于竖直位移。坡体临空面水平加速度幅值明显增大,临空面对地震加速度具有放大效应。边坡总应力从坡底沿坡高递减,在坡底总应力最大。预应力锚杆的自由段与锚固段轴力均随地震持时波动性变化,自由段轴力较大,锚固段轴力沿远离自由段方向递减。分析结果可为框架预应力锚杆加固多级高边坡的地震响应提供一定的依据。

Numerical analysis of earthquake response of multistage high slopes reinforced by frame structure with pre-stressed anchors

Based on the actual project and the Geostudio analysis software, the dynamic analysis model for a multistage high slope reinforced by frame structure with pre-stressed anchors is established. By inputting the horizontal seismic action and setting the boundary conditions, the responses of displacement, velocity, acceleration and axial force of anchors are analyzed. The results show that under the effect of horizontal earthquake, the displacement, velocity, acceleration and axial force of anchors of the slope have fluctuating change over the time of earthquake action. The horizontal displacement changes significantly and has an accumulation effect, and the horizontal displacement of slope is greater than the vertical one. The acceleration amplitude of slope surface increases obviously, which indicates that the surface of slope has an amplification effect on the earthquake acceleration. The total stress increases along the slope height, and it reaches the maximum at the bottom of slope. The axial forces of the free segment and anchorage segment fluctuatly change over the time, and the axial force of the free segment is larger, while that of the anchorage body gradually declines along the direction away from the free segment. The results can provide a reference for multistage high slopes reinforced by frame structure with pre-stressed anchors under earthquake action.