地震作用下含倾斜软弱夹层边坡内群桩的弯曲变形研究

发布时间：2018-08-19 09:42

【摘要】：针对含软弱夹层边坡场地中的群桩基础,设计并完成50 g超重力离心振动台模型试验,探讨群桩结构的弯矩分布特性和弯曲变形模式,以及场地内部变形和上部结构惯性力对群桩基础的影响。试验结果表明:地震作用下,上部结构的惯性力控制了群桩的弯曲变形,影响范围从桩顶向下为桩长的26%~28%;群桩的弯曲变形形态从整体协调变形角度可分为一致型和非一致型、有拐点型和无拐点型、平行型和非平行型;场地中倾斜软弱夹层对场地内加速度放大系数的影响与输入加速度峰值有关,随着输入加速度峰值的增大,该软弱夹层内部的放大系数呈非线性增长;此外,该上部结构与场地表面的动力响应存在明显差异,且其会随地震强度增加呈非线性扩大趋势,当输入加速度峰值≥0.25 g时会出现成倍突增现象。
[Abstract]:In view of pile group foundation in slope site with weak intercalation, 50 g high gravity centrifugal shaking table model test was designed and completed, and the bending moment distribution characteristics and bending deformation mode of pile group structure were discussed. And the influence of the deformation inside the site and the inertia force of the superstructure on the pile group foundation. The test results show that the inertial force of the superstructure controls the bending deformation of pile group under earthquake, and the influence range is from the top of pile to the length of pile, and the bending deformation of pile group can be divided into consistent type and non-consistent type from the angle of overall coordinated deformation. There are inflection point type and no inflection point type, parallel type and non-parallel type, the effect of inclined weak interlayer on the acceleration magnification factor in the site is related to the peak value of the input acceleration, and with the increase of the peak value of the input acceleration, In addition, the dynamic response of the superstructure is obviously different from that of the site surface, and the dynamic response of the superstructure increases with the increase of the earthquake intensity. When the input acceleration peak value is more than 0.25 g, the phenomenon of doubling will occur.
【作者单位】：西南交通大学土木工程学院;海南大学土木建筑工程学院;
【基金】：交通运输部建设科技项目(2013318800020) 四川省科技计划项目(2015SZ0068)~~
【分类号】：TU473.1

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