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本文以世界第一超大直径,具有穿越复合土层,高水压作用等难点的上海长江隧道为工程背景,利用数值模拟对盾构隧道掘进面的渗流效应进行了分析,探讨了地下水渗流效应对掘进面稳定的影响,分析了地下水作用下支护压力与掘进面变形的关系。根据稳定性理论的基本原理,确定了掘进面极限支护压力。极限支护压力的确定为设计和施工中掘进面最小支撑力的确定以及防止掘进面坍塌所需支护提供了依据。通过渗流作用效应的影
In this paper, the first super large diameter in the world, Shanghai Yangtze River tunnel with complex soil layers and high hydraulic pressure are selected as the engineering background. The seepage effect of shield tunneling surface is analyzed by numerical simulation. The effects of groundwater seepage effect The influence of the stability of driving face and the relationship between the supporting pressure and the deformation of driving face under the action of groundwater. According to the basic theory of stability theory, the limit support pressure of excavation face was determined. The determination of the limit support pressure provides the basis for the determination of the minimum support force in the design and construction of the heading face and the support needed to prevent the collapse of the heading face. Through the effect of seepage effect