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合福高速铁路客运专线某一隧道存在整体浅埋偏压情况,同时在线路右侧40m处有一座800kV特高压铁塔。在施工过程中发现该隧道有拱顶持续下沉现象。由于涉及隧道及铁塔安全,从而受到业主、设计、监理的密切关注,成为合福铁路重点关注的风险隧道。介绍了该隧道的地质状况,分析了隧道拱顶下沉原因,并结合施工过程详细阐述了控制隧道拱顶下沉的办法和有效措施。处理浅埋偏压隧道拱顶沉降问题,要根据监控量测数据和不同的地质条件,以及施工能力,有针对性地选择施工方案,确定合理的控制措施。
Hefei-Fuzhou Expressway passenger dedicated line of a tunnel there is the overall situation of shallow bias at the same time, 40m at the right of the line there is an 800kV UHV tower. In the course of construction, it is found that the tunnel has a continuous sinking phenomenon of the vault. Due to the safety of tunnels and towers, it is closely watched by owners, designers and supervisors and becomes the risk tunnel of the focus of Hefei-Fuzhou Railway. The geological conditions of the tunnel are introduced, the reason of the tunnel crown falling is analyzed, and the method and effective measures of controlling the tunnel crown are described in detail in combination with the construction process. To deal with the settlement of shallow dome tunnels, it is necessary to select the construction scheme according to the monitoring data and different geological conditions and the construction ability, and to determine the reasonable control measures.