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时程响应是发展锚索抗滑桩抗震技术和改进抗震设计方法的基础。基于离心模型试验平台,设计完成了50g离心加速度条件下锚索抗滑桩加固滑坡体的振动台模型试验。输入了4种不同强度的Taft地震波,利用布设在不同位置的微型传感器,记录了桩身和滑坡体的动态时程数据,并以此为基础分析了桩身和滑坡体不同位置的时程响应规律。结果表明,锚索抗滑桩和坡体的时程响应均受输入地震动控制,其动态变化形式与输入地震动基本一致;峰值加速度在基岩内部变化不大,在坡体内部从外向内呈现先减小后增大的趋势;不同高程的PGA放大系数呈现高程效应,坡面存在浅表动力效应;坡体内部PGA放大系数总体上随输入地震动的增大而增加,但在基岩面附近放大效应不明显;锚索的加设有效降低了坡体内部中心位置的加速度放大效应。研究成果可为开发科学合理的锚索抗滑桩抗震设计方法和验证数值模拟成果提供参考依据。
Time-history response is the basis of developing anti-slide technology for anti-slide piles of anchorage cable and improving seismic design method. Based on the centrifugal model test platform, the shaking table model test of the anti-slide piles reinforced landslide with 50g centrifugal acceleration was designed. Four kinds of Taft seismic waves with different intensities were input, and the dynamic time history data of the pile body and the landslide body were recorded by using the micro sensors arranged at different positions. Based on the analysis, the time-history responses of the pile body and the landslide body at different positions were analyzed law. The results show that the time-history responses of the anti-slide piles and the slope are both controlled by the input earthquakes. The dynamic changes are basically the same as the ground motions. The peak acceleration changes little in the bedrock, The PGA amplification coefficient at different elevation shows the elevation effect and the superficial dynamic effect exists on the slope; the amplification coefficient of PGA generally increases with the increase of input ground motion, The amplification effect near the surface is not obvious. The addition of the anchor cable effectively reduces the acceleration amplification effect in the center of the slope. The research results can provide reference for the development of scientific and reasonable seismic design method of anti-slide piles and verification of numerical simulation results.