振动压实填石路堤动力响应试验研究

发布时间：2019-05-31 16:13

【摘要】：对贵州三穗-黎平高速公路风化板岩路堤试验段路基不同深度埋设动土压力盒,用两种重型压路机振动压实测试不同深处竖向、水平动力响应。结果表明,振动波在土中近距离传播时频率基本保持不变或略有降低,土粒在动应力作用下处于加压-卸载的循环过程;大功率压路机对表层土产生明显推挤作用并造成表层填料松散;动应力在土中以一定角度向下扩散,不同压路机扩散角亦不同;据波动理论推导所得动应力在土中随深度以指数函数衰减获得试验数据验证,竖向动应力衰减系数是水平动应力衰减系数的2倍;超大功率压路机产生的动应力水平远大于重型压路机,重型压路机在土中局部产生共振现象;实测动侧压力系数非固定值且随深度增加线性增大。
[Abstract]:Dynamic earth pressure boxes are embedded in different depths of subgrade in the test section of weathered slate embankment of Sansui-Liping Expressway in Guizhou Province. the vertical and horizontal dynamic responses in different depths are tested by vibration compaction of two kinds of heavy roller. The results show that the frequency of vibration wave in soil is basically unchanged or slightly decreased when the vibration wave propagates at close range, and the soil particles are in the cyclic process of pressure and unloading under the action of dynamic stress. The high power roller has obvious pushing effect on the surface soil and causes the surface packing to be loose, and the dynamic stress diffuses downward in the soil at a certain angle, and the diffusion angle of different roller is also different. According to the wave theory, the experimental data obtained by exponential function attenuation of dynamic stress in soil with depth show that the attenuation coefficient of vertical dynamic stress is twice as much as that of horizontal dynamic stress. The dynamic stress level of the super high power roller is much higher than that of the heavy roller, and the resonance phenomenon occurs locally in the soil, and the measured dynamic side pressure coefficient is not fixed and increases linearly with the increase of depth.
【作者单位】：中南大学土木工程学院;湖南工程学院建筑工程学院;湖南科技大学土木工程学院;
【基金】：贵州省交通科技项目(2013122005) 湖南省科技创新项目(2012TT2039)
【分类号】：U416.1

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