【摘要】 仰拱是隧道衬砌结构的重要组成部分,能提高隧道结构的承载能力。以往的研究主要通过塑性区范围、应力、位移大小分析仰拱所起的作用。基于有限元强度折减法对比分析不同地质状况下仰拱对大跨扁平隧道整体安全系数大小的影响,得到一些有益的结论,为解决类似问题提供一种新思路。更多还原

【Abstract】 The inverted arc is an important part of the tunnel lining structure and can improve the bearing capability of tunnel structure.The previous researches analyzed the role played by the inverted arch mainly via the range of plastic zone,stress and displacement.This paper based on strength reduction finite element method(FEM) compares and analyzes the influence of the inverted arch on the safety factor of the whole large-span flat tunnel under different geological conditions and has drawn some beneficial conclusions so as to provide a new idea for solving similar problems.更多还原