摘要
为评估北京地铁4号线运行对拟建场地的影响,在不同时间段测试了场地不同位置和不同深度的特征周期和振幅。得出午间场地特征周期地面平均为0.13s,孔中为0.12s;午夜地面平均值为0.21s,孔中为0.18s,建筑物的结构设计应避开以上周期,以避免产生共振。午间测得的周期均小于午夜,孔中均小于地面;午间地面振幅均大于午夜,孔中均小于地面。不同时段所测值均有差异,表明地铁运行对拟建场地具有一定的影响。从地基土特性、与轨道间距离和振动传播方向等三方面探讨了场地特征周期和振幅的变化规律,提出了场地抗振减振的一般措施。
In order to evaluate the effect on the proposed construction site induced by the operation of subway Line No. 4 in Beijing, the predominant period and amplitude at different positions and depths is measured during different period. The average predominant period at noon is 0. 13s on the surface and 0. 12s in the hole, and 0. 21s at midnight on the surface and 0. 18s in the hole. The predominant periods of the building should avoid the above to prevent resonance. The average predominant periods measured at noon are less than that at midnight, and the values in the hole are smaller than that on the surface. The average amplitude measured at noon is greater than that at midnight, and the values in the hole are smaller than that on the surface. The values at different times are different, which shows the effect of the subway operation on the construction site. The general measures for vibration damping are put forward by the study on the predominant period and amplitude of the ground in three aspects including the soil characteristics, distance between track and the site, vibration propagation direction etc.
出处
《工程勘察》
2014年第4期91-94,共4页
Geotechnical Investigation & Surveying
基金
北京市教育委员会科技计划面上资助项目(项目编号:KM201310853004)
关键词
地铁运行
场地动力特性
特征周期
振幅
subway operation
field dynamic characteristics
predominant period
amplitude
