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本文以广州轨道交通十四号线一期工程为背景,进行富水超厚砂卵石层浅埋泥水盾构隧道地表沉降因素分析。利用限元软件MidasNX建立盾构隧道开挖三维有限元模型,模型中综合考虑土体分层、土体的非线性、盾构的顶推力、盾构管片、盾构壁厚等因素,对盾构隧道开挖过程进行了数值模拟,研究盾构隧道施工对地表变形的影响,并对不同覆土厚度、注浆压力、注浆层厚度、掘进压力等主要施工因素进行了模拟分析,探讨了在富水超厚砂卵石层浅埋泥水盾构隧道中,以上因素与地表沉降变形关联的规律和原因,旨在起到优化设计、指导施工的作用。
In this paper, on the background of the first phase of Guangzhou Metro Line 14, the ground subsidence factors of the shallow buried slurry shield tunnel with water-rich ultra-thick sand and gravel are analyzed. The three-dimensional finite element model of shield tunnel excavation is established by using finite element software MidasNX. The factors such as soil stratification, soil nonlinearity, thrust force of shield, shield segment and shield wall thickness are all considered in the model. The influence of shield tunnel construction on the deformation of the ground surface is studied numerically. The main construction factors such as thickness of grouting, grouting pressure, grouting layer thickness and tunneling pressure are simulated and analyzed. In the water-rich super-thick sand and pebble layer of shallow buried slurry shield tunnel, the above factors and the law of surface subsidence and the associated causes and causes are designed to optimize the design and guide the construction of the role.