OPTIMIZED DESIGN OF XINDAOGOU DOUBLE VAULT TUNNEL ALONG BEIJING-CHENGDE FREEWAY

This paper presents results of the wall rock resistance,the lining-stress,distortion and stability of XinDaoGou double vault tunnel along Beijing-Chengde highway using the finite element method.The model was developed based on structure of double vault lining with the wall rock resistance which is simulated by elasticity pole cell.In addition,the secondary lining strength in maximal measured-stress face is checked against design specification of high way tunnel.Such results provide guidelines for the optimizing design of XinDaoGou tunnel.