【摘要】 某Ⅲ级围岩场地大跨度双连拱隧道工程为依托,基于弹塑性本构关系和D-P屈服准则,采用"地层-结构"模型,应用ANSYS程序分别对工程中的四种开挖方法(即中导洞全断面开挖、中导洞半断面法、三导洞全断面法、三导洞半断面法等)进行了数值模拟。分析、评价了四种工法条件下的围岩位移场、围岩应力场、支护结构受力三个方面的变化规律,获得了一些有意义的结论,可以为大跨度连拱隧道设计和施工提供参考依据。更多还原

【Abstract】 Four excavation methods(middle-pilot and full-face,middle-pilot and half-section,three-pilot and full-face and three-pilot and half-section) of the construction of a large-span double-arch tunnel with grade Ⅲ surrounding rock are numerical simulated by means of ANSYS software,on basis of lastic-plastic constitutive relationship and D-P yield criterion and strata-structure mode.Variation rules of displacement of surrounding rock,stress of surrounding rock and force of supporting structure under 4 construction methods are analyzed and evaluated.The conclusions obtained can provide reference for the design and construction of large-span double-arch tunnel.更多还原