前后排抗滑桩加固滑坡桥基的振动台试验研究

发布时间：2018-01-12 00:08

本文关键词：前后排抗滑桩加固滑坡桥基的振动台试验研究　出处：《岩石力学与工程学报》2017年09期 　论文类型：期刊论文

【摘要】：设计并完成前后排抗滑桩加固滑坡桥基的振动台模型试验。通过输入不同频率、加速度峰值的正弦波,分析振动时桥墩基桩、抗滑桩的受力变形规律,以及PGA放大系数变化特性。试验结果显示,当滑体为可塑的粉质黏土时,后排抗滑桩桩后土压力峰值分布随台面加速度峰值变化,由三角形逐渐变为倒三角形;由于桥墩、后排抗滑桩间距很小,两者相互作用增强,桥墩基桩受到较大的动力荷载影响,随着台面振动加速度峰值增加,桥墩基桩的应变最大值从桩顶下移至滑面附近;当正弦波加速度峰值相等时,频率越高,土体黏滞阻尼越小,滑坡的PGA放大系数越大,相应云图呈层状分布,同时高频振动波使土体产生较小的位移和变形,导致滑坡推力也较小;振动波在向上传播时,土体存在滤波效应,自振频率附近的频谱幅值会被放大。
[Abstract]:Design and complete the shaking table model test of the front and rear row anti-slide pile to strengthen the landslide bridge foundation. Through input the sine wave of the different frequency and the acceleration peak value, analyze the force and deformation law of the pier foundation pile and the anti-slide pile during vibration. The experimental results show that when the slider is silty clay, the peak distribution of earth pressure changes with the peak of platform acceleration when the slider is a plastic silty clay. From triangles to inverted triangles; Because of the small distance between the two piles, the interaction between the two piles is enhanced, and the pile foundation is affected by the larger dynamic load, and the peak value of the acceleration increases with the vibration of the table surface. The maximum strain of the pile is moved from the top of the pile to the vicinity of the sliding surface. When the peak value of sinusoidal acceleration is equal, the higher the frequency, the smaller the viscous damping, the larger the PGA magnification factor of the landslide, and the more layered the corresponding cloud image is. At the same time, the high frequency vibration wave causes the soil to produce small displacement and deformation, resulting in the landslide thrust is also smaller; When the vibration wave propagates upward, there is a filtering effect in the soil, and the amplitude of the frequency spectrum near the natural vibration frequency will be amplified.
【作者单位】：西南交通大学土木工程学院;西南交通大学高速铁路线路工程教育部重点实验室;中铁二院工程集团有限责任公司;
【基金】：铁道部科技研究开发计划重大课题(Z2012 061)~~
【分类号】：U443.1
【正文快照】： 受地形地质条件影响,大量山区铁路桥梁基础不可避免地位于滑坡等不良地质体上,同时线路穿越高烈度地震区,需要设计抗滑支挡结构进行抗震加固[1]。目前,针对桥梁基础受力变形的动静态试验研究已陆续展开,并取得一些具有工程实践意义的科研成果。N.A.Szavits等[2]通过监测克罗地

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