【摘要】 盾构隧道内车辆通行对隧道产生动力作用,可能导致隧道周围软土层产生较大沉降.基于无线传感网络平台,对大直径越江公路隧道内衬砌与路面板在车辆荷载激励下的振动特性进行现场实测,获得时域与频谱信号,分析得到管片与箱涵底板的最大垂向加速度幅值与振动优势频率,发现箱涵底板与隧道管片垂向振动同步的规律.测试结果可为隧道周围地层沉降变形分析参数取值提供参考.更多还原

【Abstract】 The dynamic effect caused by vehicles passing the shield tunnel is likely to lead to great soil settlement in soft soil around the tunnel. Based on wireless sensor network platform, a measurement was performed to obtain vibration characteristics of the tunnel segment sand pavement slabs in tunnels of large-diameter crossing-river highways. By analyzing signals in both time and frequency domains,the maximum vertical acceleration amplitude and the predominant frequency of tunnel segment and box culvert bottom plates were obtained. The analysis shows that the vertical vibration of both culvert and tunnel segments are in synchronization. The investigation results can offer reference for parameter value for the settlement analysis of the strata around the tunnel.更多还原