新建隧道施工对既有隧道的影响分析

摘要

Longxiang Tunnel in Dali to Lijiang Highway overpasses Yulongshan Tunnel in Guang-Da Railway with a minimum distance 19.6 m.With the empirical method,the paper analyzed the influence of new tunnel construction on the existing tunnel.With the numerical analysis method,the law of the existing tunnel being influenced is analyzed and its key points are presented.Based on the results both of the experience and numerical simulation,reasonable deformation warning value and admissible value of the existing tunnel and the location,area and size of the existing tunnel being influenced are presented.%大理至丽江高速公路龙翔隧道上跨广大铁路浴龙山隧道,与既有隧道衬砌最小净距为19.6 m。根据经验法,分析了新建隧道对既有隧道的影响。借助数值分析方法,分析了既有隧道受影响的规律,把握了影响分析的重点。根据经验及数值模拟结果,提出既有隧道比较合理的变形预警值和容许值,既有隧道受影响的位置、范围及尺寸。