The double-arch tunnel is the transition from the large-section tunnel of turnoff to the main tunnel and link tunnel.
双连拱隧道是作为道岔区间大断面隧道过渡到正线隧道及联络线隧道的一种过渡断面。
参考来源 - 城市地铁群洞隧道施工地表沉降研究·2,447,543篇论文数据，部分数据来源于NoteExpress
合理的扁平率对大断面隧道稳定性和经济性具有重要的意义。
Reasonable span-ratio has an important effect on configuration stability and economical nature of large-span tunnel.
同时，论述了大跨度隧道的稳定性以及断面尺寸、扁平率和隧道埋深对稳定性的影响。
At the same time, the stability of big-span tunnel with influence factor such as section size, high-span ratio and depth is studied.
其次，根据构建原则筛选建立山岭地区大断面公路隧道施工风险预警指标体系。
Secondly, according to construction principle and select to build the establishment of mountain regions large-section of highway tunnel construction risk early-warning indicators.
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