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下穿大堤盾构隧道将引起地层变形与地表沉降,以南京市纬三路过江隧道工程为背景,通过对比现场监测和理论计算结果,并采用数值模拟方法,研究了盾构下穿防洪堤引起的地层变形和地表沉降规律。结果表明,除管片安装完成初期考虑椭圆化地层变形得出的理论解外,实测地表沉降槽要深于两种理论结果。同时对比了实测和数值模拟计算得出的堤顶处的历时地表沉降曲线,分析结果验证了数值模拟方法在预测盾构掘进过程中地表沉降的可行性。
Under the embankment shield tunnel will cause strata deformation and surface subsidence. Based on the Weisan Road cross-river tunnel project in Nanjing City, by comparing with on-site monitoring and theoretical calculation results, and numerical simulation method, Strata deformation and surface subsidence law. The results show that, except for the theoretical solution of elliptical formation deformation in the early stage of pipe installation, the measured surface subsidence groove is deeper than two theoretical results. The time-dependent surface subsidence curves at the dike top calculated from the measured and numerical simulations are also compared. The results verify the feasibility of the numerical simulation method in predicting the ground subsidence during the shield tunneling.