摘要
本文以攀枝花机场12#滑坡Ⅱ-Ⅱ’断面治理工程为研究对象,以有限差分软件FLAC3D为研究工具,通过对坡体以及支挡结构的动力响应分析,得到如下结论:(1)坡体各测点峰值加速度出现时间稍微落后于输入地震波的峰值时间,表明由于边坡材料的阻尼作用,边坡动力响应存在滞后现象;(2)加速度放大系数总体随高程增加而增加,具有明显的高程放大效应。且突变点的存在表明支挡结构对于边坡的加速度放大效应具有一定的抑制作用;(3)外凸边坡处加速度响应较其他位置更为强烈,体现了明显的临空面放大效应;(4)地震对于抗滑桩桩身弯矩以及锚索预应力的影响不大,表明锚索抗滑桩加固边坡具有一定的抗震作用。
Taking Panzhihua Airport 12 # landslide II-II section treatment project as the research object,the dynamic response to the slope body and supporting structure was analyzed based on the finite difference software FLAC3 D. The conclusions are as follows:(1) The peak acceleration time at each measuring point lags slightly behind the peak time of input seismic wave. It shows that the slope dynamic response is delayed due to the damping effect of the slope material.(2) The acceleration magnification coefficient increases with the elevation,and has obvious elevation amplification effect. The existence of the abrupt point shows that the retaining structure has a certain inhibitory effect on the acceleration amplification effect of the slope.(3) The acceleration response at the extruding position of the slope is more intense than that of other positions,which reflects the obvious effect on the enlargement of the surface.(4) The earthquake has little influence on thebending moment of the anti slide pile and the prestress of the anchorage cable,which shows that the anchorage pile to reinforce the slope has a certain earthquake-proofing capacity.
引文
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