【摘要】 目的研究环境振动在沿线地面上的传播规律,以便预测轨道沿线振动水平.方法通过对各测点加速度时程数据统计结果的比较,总结环境振动传播的一般规律,在最小二乘准则条件下,采用数理统计回归方法,提出地面垂向振动衰减的经验公式.结果观测数据的统计结果与理论分析一致,垂向振动水平高出水平向较多,评价环境振动水平时,应以垂直方向的振动为主.结论环境振动水平随着距轨道中心线距离的增加逐渐衰减,提出的经验公式与实测的环境振动衰减规律符合程度较好,也可为相类似条件下的城市轨道交通地面运营线路沿线的振动水平提供可靠的预测.更多还原

【Abstract】 The purpose of the study is to get the propagation laws of environmental vibration induced by moving urban rail transit on ground.The general propagation rules were obtained by comparing statistical data of environmental vibration in field.The mathematical statistics method under the criterion of least-squares was employed to establish the empirical attenuation formula of vertical ground vibration.The result obtained from the formula agreed with the statistical result of field observation data well.The vertical ground vibration level was much higher than horizontal ones.So the vertical ground vibration level was the most important aspect when evaluating environmental vibration level on ground.In general,the ground vibration level is attenuating while the distance between observation point and track center increasing.The empirical formula built in this article can do well in computing the attenuation of the environmental vibration induced by moving urban rail transit on ground,and it can also provide reliable prediction for other ground vibration with the similar conditions.更多还原