基于数值模拟的北京地区地下道路立交隧道围岩变形分析

发布时间：2018-08-14 10:33

【摘要】：城市地下道路立交隧道施工过程中围岩变形分析是工程建设中的核心问题。依托北京城市地下道路工程,采用城区地质条件分层概化方法、三维数值模拟方法分析了临时仰拱台阶法(台阶法)、中隔壁法(CD法)、交叉中隔壁法(CRD法)和双侧壁导坑法(双侧壁法)施工影响下的立交隧道地表沉降、洞周变形和塑性区分布特征,明确了立交区域上下层隧道施工的影响规律。研究发现,立交区域同时受到了上下层隧道施工的影响,在地表形成椭球形的沉降盆,在洞周出现了较大的差异沉降;在地表地层和洞周拱脚、拱肩截面的"X"形区域出现了较为集中的破坏区;CRD法和双侧壁法在控制立交隧道地层变形和破坏方面具有明显优势。研究成果可为北京城市地下道路立交隧道设计、施工决策制定提供参考。
[Abstract]:The analysis of surrounding rock deformation in the construction of urban underground road interchange tunnel is the core problem in engineering construction. Depending on the underground road engineering in Beijing, the stratification and generalization method of geological conditions in urban area is adopted. Three dimensional numerical simulation method is used to analyze the surface settlement of the interchange tunnel under the influence of temporary inverted arch step method (step method), middle adjoining method (CD method), cross middle adjoining method (CRD method) and double lateral wall guide pit method (double side wall method). The deformation around the tunnel and the distribution of the plastic zone are analyzed, and the influence law of the upper and lower layer tunnel construction in the interchange area is clarified. It is found that the overpass area is affected by the construction of the upper and lower layers of tunnels at the same time, and an ellipsoidal subsidence basin is formed on the surface, and a large differential settlement occurs around the hole, and at the surface stratum and the arch around the hole, In the "X" section of the arch shoulder section, there is a relatively concentrated failure area, the CRD method and the double lateral wall method have obvious advantages in controlling the deformation and failure of the overpass tunnel. The research results can provide reference for the design and construction decision making of Beijing underground road interchange tunnel.
【作者单位】：北京交通大学城市地下工程教育部重点实验室;北京城市交通协同创新中心;
【基金】：十二五科技支撑计划项目(2012BAJ01B03)
【分类号】：U456.31

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