重叠隧道盾构施工期间地表沉降与隧道变形的数值模拟与分析

Study on the ground surface subsidence and existing tunnel deformation during small spacing overlapped tunnel construction

以天津地铁5号线某段重叠隧道工程为背景,建立了精细化模拟的有限元数值模型。结合已有研究,分析了重叠隧道在不同施工顺序工况下引发的地表沉降大小关系,丰富了已有研究得出的简单定性结论。此外,针对不同加固方案下重叠隧道施工时的既有隧道变形开展了对比分析,并给出了定量评价。

Based on the overlapped tunnel construction of a section of Tianjin Metro line 5,this paper established a sophisticated finite element model.Aiming at the previous studied conclusions which existed divergent on the different construction sequences on overlapped tunnels leads to different ground surface subsidence,this paper conducted a study on the influence of overlapped tunnel construction sequence,to enrich the simple qualitative conclusions obtained from existing studies.Also,comparing and analyzing the deformations of existed tunnels deformations under different reinforcement schemes for overlapped tunnel construction,this paper presented the quantitative evaluation.