秦岭终南山特长隧道竖井衬砌的数值计算

选取建设规模居世界第一的秦岭终南山隧道1号通风竖井为研究对象,根据设计提供的支护参数,采用M IDA S/GTS真实模拟了竖井施工的全过程。通过对竖井初期支护、竖井二次衬砌的受力状态分析,评价了衬砌结构的安全性。结果表明:对于竖井二次衬砌,在距离送风道交接口边缘约5 m区域内,是高应力聚集区,是需要设计中重点加强的关键部位,普通素混凝土不能保证结构的安全,需要采取增配钢筋进行补强。竖井二次衬砌的其余地段和送风道排风道二次衬砌,设计时可以作为安全储备,仅需要按照构造要求进行设计。

Numerical Computing of Shaft Lining of Zhongnanshan Extra-Long Tunnel in Qinling Mountain

Taking the ventilating shaft of Zhongnanshan Tunnel in the Qinling Mountain as the research prototype,whose construction scale is the largest in the world.MIDAS/GTS is applied to simulate the whole the construction process.On the basis of stress state analysis,the safety of the lining structure is investigated.The results show that the stress is highly concentrated on the area which is 5 m far from the edge of the cross section and which is the key area to be reinforced,because the plain concrete can not ensure the structural safety,reinforcements are needed to be used.The secondary lining on other places in the shaft and ventilating shaft can be only decided by the structure requirements,which results in more safety storage.