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采用数值分析和地质力学模型试验2种手段对分岔隧道中四车道大拱段和连拱段、连拱段和小净距段2个过渡段进行了研究,并在工程现场对关键断面进行了监控量测;数值分析采用的是有限单元法,在模型试验中研发了组合式三维地质力学模型试验系统和铁晶砂胶结相似材料;对3种手段的结果进行比较分析。结果表明:从横向来看,过渡段拱顶、中隔墙和中隔岩柱等部位受隧道开挖的影响较大;从纵向来看,过渡段Ⅱ比过渡段Ⅰ危险。
In this paper, two methods of numerical analysis and geomechanical model test are used to study two large transition sections of four-lane large arch sections, even arch sections, even arch sections and small clear sections in bifurcated tunnels. Critical sections In the model test, a combined three-dimensional geomechanical model test system and similar materials of ferrite sand cement were developed. The results of three methods were compared and analyzed. The results show that in the transverse direction, the influence of tunnel excavation on the vault, middle wall and septal rock mass in the transitional section is greater. From the longitudinal perspective, the transition section Ⅱ is more dangerous than the transitional section Ⅰ.