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一、问题提出六十年代以来,在上海饱和软土地层中,利用普通盾构建造隧道已有二十多条,直径最小的隧道Ф4.2米,最大的延安东路越江隧道直径为Ф11.0米,已建隧道近二十公里,已造盾构数十台。盾构法施工时,根据环境、地质条件以及对地表沉陷幅值的要求,或用降水疏干地层或用气压疏干地层;
I. PROBLEM PROBLEMS Since the 1960s, more than 20 tunnels have been constructed using normal shield tunnels in Shanghai’s saturated soft soil formations. The tunnel with the smallest diameter is 4.2 meters and the largest cross-river tunnel with a diameter of Yan11 is Yan11. 0 meters, the tunnel has been built nearly 20 kilometers, has made dozens of shields. Shield construction method, according to the environment, geological conditions and the requirements of the amplitude of the surface subsidence, or by dry dewatering stratosphere or gas stratum dry;