高速铁路加筋土挡墙动响应规律现场试验

摘要

为研究土工格栅加筋土挡墙在高速列车荷载作用下的动态响应规律并分析其作用机理,设计并进行了现场激振试验,研究了加筋土挡墙内加速度、动土压力等动态响应的分布规律,并进行了不同墙面形式挡墙动态响应规律的对比分析.研究结果表明:加筋土的竖向加速度随加载次数的增加基本没有变化;靠近墙面处水平动土压力沿墙高呈单峰值分布,峰值位于2/3墙高处;随加载次数的增加,垂直动土压力增长很小;在顶部不到1/3墙高的范围内,竖向加速度衰减了87％ ～91％,垂直动土压力衰减了86％;模块式加筋土挡墙具有刚度大、变形小、整体性好等优点.%In order to study the dynamic responses and mechanism of geogrid reinforced soil retaining wall under the loads of high-speed vehicles,in-situ vibration excitation tests were conducted to obtain distributions of acceleration and dynamic soil pressure in geogrid reinforced soil retaining wall.The dynamic responses of different wall faces were compared.The results show that,with the increase of load cycles,the vertical acceleration of reinforced soil is nearly unchanged.The dynamic soil pressure near wall surface in the horizontal direction has a single-peak distribution and its max-value is located at 2/3 of the wall height.The vertical dynamic soil pressure has a little increase with the number of load cycles.In the range from wall top to 1/3 wall height,the vertical acceleration attenuates 87％-91％ and the vertical dynamic soil pressure attenuates 86％.The reinforced soil retaining wall with block panel has the merits of large rigidity,small deformation and strong integrity.