新建隧道上跨时既有运营隧道安全性评价  

Safety Evaluation of Existing Operating Tunnel under Newly Built Overpass Tunnel

作　　者：王艳波 WANG Yanbo(Shanxi Jiaoke Highway Survey&Design Institute Co.,Ltd.,Taiyuan,Shanxi 030032,China)

机构地区：[1]山西交科公路勘察设计院有限公司,山西太原030032

出　　处：《山西交通科技》2024年第3期102-107,共6页Shanxi Science & Technology of Transportation

摘　　要：随着公路建设的不断推进,新建隧道不可避免地与既有隧道存在交叉,新建隧道以分离立交形式上跨或者下穿既有隧道。以新建隧道上跨既有运营隧道为背景,通过采用荷载-结构法及平面应变模式,分别计算了两种工况下既有隧道初期支护安全系数、二次衬砌安全系数、二次衬砌裂缝宽度,得出结论:计算工况下的既有隧道初期支护和二次衬砌安全系数均满足强度设计要求,裂缝宽度满足正常使用要求。As highway construction continuously develops,the newly built tunnel inevitably crosses over or under existing tunnels in the form of separate interchanges.Based on the construction of an overpass tunnel crossing the existing operating tunnel,this paper calculated the initial support safety factor,secondary lining safety factor,and secondary lining crack width of the existing tunnel under two calculation conditions via the load-structure method and plane strain mode,respectively.It can be concluded that the initial support and secondary lining safety factors of the existing tunnel under the calculation condition all met the strength design requirements and the crack width met the requirement of normal use.

关 键 词：新建隧道 既有隧道 分离立交 安全性评价 

分 类 号：U458[建筑科学—桥梁与隧道工程]