基于动力离心试验的锚拉桩加固滑坡时程响应分析

发布时间：2018-06-30 05:54

本文选题：离心振动台试验 + 锚索抗滑桩　；参考：《自然灾害学报》2017年03期

【摘要】：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。
[Abstract]:Time-history response is the basis of developing anti-sliding pile seismic technology and improving seismic design method. Based on the centrifugal model test platform, the shaking table model test of anti-slide pile reinforced by anchor cable under 50 g centrifugal acceleration was designed and completed. Four kinds of Taft seismic waves with different strength were inputted, and the dynamic time history data of pile body and landslide body were recorded by using micro-sensors arranged in different positions. Based on these data, the time-history response law of pile body and landslide body at different positions was analyzed. The results show that the time-history response of anti-slide pile and slope body of anchor cable is controlled by the input ground motion, and its dynamic change is basically the same as that of the input ground motion, and the peak acceleration does not change much in the bedrock. The PGA magnification coefficient of different elevation shows elevation effect and superficial dynamic effect, and the PGA magnification coefficient of slope increases with the increase of input ground motion as a whole, the PGA magnification coefficient decreases firstly and then increases from outside to inside the slope, and the PGA magnification coefficient of different elevation shows elevation effect and superficial dynamic effect on the slope, and the PGA magnification coefficient increases with the increase of input ground motion. However, the amplification effect near the bedrock surface is not obvious, and the acceleration amplification effect in the central position of the slope is effectively reduced by the addition of anchor cables. The research results can provide a reference for the development of scientific and reasonable anti-slide pile seismic design method and verification of numerical simulation results.
【作者单位】：中国地震局工程力学研究所中国地震局地震工程与工程振动重点实验室;地壳运动监测工程研究中心;浙江省交通工程建设集团有限公司;桂林理工大学;
【基金】：国家自然科学基金项目(41172293;51408559)~~
【分类号】：P642.22;TU435

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