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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 assess the impact of the operation of Beijing Metro Line 4 on the proposed site, characteristic periods and amplitudes at different locations and depths of the site were tested at different time intervals. The results showed that the average ground-level period of the noon site was 0.13s, and the hole was 0.12s. The mid-night average was 0.21s and the hole was 0.18s. The structure of the building should be designed to avoid the above period to avoid resonance. Afternoon measured the cycle is less than midnight, the hole is smaller than the ground; midday ground amplitude greater than midnight, the hole is smaller than the ground. The measured values at different time periods are different, indicating that the subway operation has a certain impact on the proposed site. From the characteristics of foundation soil, the distance between tracks and the propagation direction of vibration, the changing regularity of characteristic period and amplitude of the site was discussed and the general measures of anti-vibration and vibration reduction of the site were put forward.