城市浅埋双连拱双层隧道结构安全性分析

Analysis on the Structural Safety of Urban Shallow Buried Twin-arch and Double-deck Tunnels

双连拱双层隧道是一种新型的隧道结构形式,其结构安全性的研究还处于起步阶段。依托自贡市龙汇路双连拱双层隧道,研究了隧道结构的安全性。结果表明:施加桩基后,隧道初期支护最小安全系数为2.51,二次衬砌最小安全系数为37.90,结构满足受力要求,隧道结构是偏于安全的;施加地震荷载后,隧道结构受力发生了不利的变化,初期支护最小安全系数为2.39,二次衬砌最小安全系数为4.60,但仍能满足受力要求,隧道结构是偏于安全的。研究成果可为双连拱双层隧道的设计和应用提供参考。

Twin-arch and double-deck tunnel is a new type of tunnel structure,and the research on its structural safety is still in its initial stage.Based on the twin-arch and double-deck tunnel of Longhui Road in Zigong city,this paper studies its structural safety.The results show that after the application of pile foundation,the minimum safety factor of the initial support is 2.51 and the minimum safety factor of the secondary lining is 37.90;the structure meets the stress requirements,and the tunnel structure is inclined to safety;after the application of earthquake load,the stress of the tunnel structure changes adversely;the minimum safety factor of the initial support is 2.39 and the minimum safety factor of the secondary lining is 4.60,but it can still meet the stress requirements,and the tunnel structure is inclined to safety.The research results can be used as a reference for the design and application of twin-arch and double-deck tunnels.