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针对浅埋暗挖中洞法的施工特点,结合北京地铁五号线天坛东门站工程,利用3D-σ有限元计算程序对其施工过程进行三维数值模拟,通过计算结果数据的整理与分析,总结了浅埋暗挖中洞法施工引起的地表沉降规律,得出中洞开挖、临时支撑拆除和二次衬砌施工是中洞法施工中对地层扰动较大工序的结论,并对今后类似施工提出了建议。
According to the construction characteristics of the middle-hole method of shallow-buried excavation, combining with the project of East Gate Station of the Temple of Heaven on the 5th line of Beijing Subway, the 3D-σ finite element program is used to carry out three-dimensional numerical simulation of its construction process. Through the collation and analysis of the calculated data, Summarizes the law of surface subsidence caused by the method of tunneling in shallow buried excavation, and concludes that middle tunnel excavation, temporary support removal and secondary lining construction are the major disturbances to the formation in the middle tunnel construction, give suggestions.