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城市中修建过江隧道通常要穿越两岸防洪大堤,盾构的掘进势必会扰动大堤下卧地层,引起地层位移,以往工程实例研究显示,大堤沉降比普通地表沉降要大很多,而不均匀沉降过大将导致大堤开裂,威胁到大堤的稳定性与安全性。本文基于长沙市南湖路湘江隧道工程实例,对大直径泥水盾构斜下穿湘江西岸防洪大堤过程中,大堤超载、偏压以及大堤下卧饱和粉细砂地层引起的施工风险进行分析,同时提出大直径泥水盾构斜下穿大堤时泥水压力、顶推力参数设置和饱和粉细砂地层中掘进速度控制的相关措施。
The construction of cross-river tunnels in urban areas usually cross the flood control embankments across the Strait. The tunneling of the shields is bound to disturb the ground below the embankment and lead to the displacement of the ground strata. Previous engineering studies show that the settlement of the large embankments is much larger than ordinary surface subsidence, The general led to the embankment cracking, threatening the stability and safety of the dike. Based on the example of Xiangjiang River tunnel project of Nanhu Road in Changsha City, the construction risk of large-diameter mud-water shield obliquely crossing the flood control embankment in the west bank of Xiangjiang River during the process of embankment overloading and biasing as well as the saturated silty sand ground below the embankment is analyzed. Correlation Measures of Pressure of Slurry Water, Setting Parameters of Thrust Force and Controlling Heading Speed of Saturated Fine Sandstone Stratum when Large Diameter Slurry Shield Is Penetrating Levee.