城市跨江盾构隧道运营期沉降规律研究

Research on Settlement Law of Urban Cross-River Shield Tunnels during Operation Period

摘要:

根据某城市跨江盾构隧道近10年运营数据，结合隧道结构沉降情况及隧道河床冲淤数据，分析城市跨江盾构隧道在运营期的沉降规律。结果表明：自隧道开始运营之后，隧道整体累计沉降变化曲线随时间整体趋势呈现“U”形。在运营第6年，其累计沉降量达到最大值，而后累计沉降量逐年下降。覆土厚度对开始运营阶段的沉降量有显著影响，但是随着隧道以及隧道周边环境趋于稳定，隧道运营期覆土厚度的变化对隧道整体沉降趋势影响并不显著。

Abstract:

Based on the operation data of an urban cross-river shield tunnel in the past 10 years, combined with the tunnel structure settlement conditions and tunnel river bed erosion and siltation data, the settlement law of urban cross-river shield tunnels during the operation period is analyzed. The results show that since the tunnel began operation, the overall cumulative settlement change curve of the tunnel has shown a “U” shape over time. In the sixth year of operation, its cumulative settlement reached a peak, and then the cumulative settlement declined year by year. The thickness of the covering soil has a significant impact on the settlement amount at the beginning of the operation period. However, as the tunnel and the surrounding areas of the tunnel tend to stabilize, changes in the thickness of the covering soil during the operation period of the tunnel do not have a significant impact on the overall settlement trend of the tunnel.