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3D Finite Element Analysis of TBM Water Diversion Tunnel Segment Coupled with Seepage Field

机译:TBM引水隧洞渗流场的3D有限元分析。

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In most studies of tunnel boring machine(TBM)tunnelling, the groundwater pressure was not consid-ered, or was simplified and exerted on the boundary of lining structure. Meanwhile, the leakage, which mainly oc-curs in the segment joints, was often ignored in the relevant studies of TBM tunnelling. Additionally, the geological models in these studies were simplified to different extents, and mostly were simplified as homogenous bodies. Considering the deficiencies above, a 3D refined model of the surrounding rock of a tunnel is firstly established using NURBS-TIN-BReP hybrid data structure in this paper. Then the seepage field of the surrounding rock con-sidering the leakage in the segment joints is simulated. Finally, the stability of TBM water diversion tunnel is stud-ied coupled with the seepage simulation, to analyze the stress-strain conditions, the axial force and the bending moment of tunnel segment considering the leakage in the segment joints. The results illustrate that the maximum radial displacement, the minimum principal stress, the maximum principal stress and the axial force of segment lining considering the seepage effect are all larger than those disregarding the seepage effect.
机译:在大多数对隧道镗床(TBM)隧道的研究中,地下水压力未被升压,或者被简化并施加在衬里结构的边界上。同时,在TBM隧道的相关研究中往往忽略了分段关节中的渗漏,这些泄漏在TBM隧道的相关研究中往往被忽略。另外,这些研究中的地质模型被简化为不同的范围,并且主要被简化为均匀体。考虑到上述缺陷,首先在本文中使用NURBS-TIN-BREP混合数据结构首先建立了隧道周围岩石的3D精制模型。然后,模拟了周围岩石剥离的渗流场的渗漏场。最后,TBM输液隧道的稳定性与渗流仿真相结合,分析应力 - 应变条件,考虑段关节泄漏的隧道段的轴向力和弯矩。结果说明了考虑渗流效应的最大径向位移,最小主应力,最大主应力,最大主应力和段衬里的轴向力均大于忽视渗流效应的渗流。

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