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饱和软土盾构隧道施工中,对于刚脱出盾尾的隧道经常会出现局部或整体上浮,隧道直径越大、覆土越浅,上浮现象越为突出,表现为隧道错台大、螺栓被剪断乃至轴线偏位,影响到隧道的稳定和施工质量等,传统抗浮设计未能考虑处于时变特性单液浆中隧道的浮力动态因素,现行相关设计规范也没有对隧道抗浮设计和施工措施做出明确的规定。文章首先介绍了上海长江隧道抗浮模型试验与结果,确定了超大直径隧道动态上浮力,以此为基础提出了隧道上浮稳定机理,并建立了盾构隧道上浮计算的理论模型,据此进行了上海长江隧道抗浮验算,并提出了相应的抗浮技术措施。
In the construction of saturated soft soil shield tunnel, partial or total floating often occur in the tunnel just emerging from the shield tail. The larger the diameter of the tunnel and the shallower the overburden, the more prominent the floating phenomenon is, the larger the tunnel is, and the bolt is cut or even the axis Offset, affect the stability of the tunnel and construction quality, the traditional anti-floating design failed to consider the time-varying characteristics of a single slurry in the dynamic buoyancy of the tunnel, the current design norms related to anti-floating tunnel design and construction measures to make Clear rules. The article firstly introduces the test and results of the anti-floating model of the Shanghai Yangtze River Tunnel and determines the dynamic buoyancy of the super-large-diameter tunnel. Based on this, the stabilizing mechanism of the tunnel is put forward and the theoretical model of the calculation of the shield tunnel is established. Shanghai Yangtze River tunnel anti-floating calculation, and put forward the corresponding anti-floating technical measures.