穿越土岩交界面的隧洞围岩变形数值模拟分析OACSTPCD

In view of the deformation of surrounding rock at the interface between soil and rock caused by heavy rainfall,relying on the No.1 tunnel of the main canal of an irrigation project,the numerical simulation method of fluid-solid coupling theory is used to simulate the deformation of the tunnel at this part,and the influence of parameters such as different elastic modulus,different cohesion,different friction angles and different soil-rock interface on the deformation of surrounding rock are analyzed.The results show that,(a)the heavy rainfall is the main cause of tunnel deformation;(b)the vault settlement is more sensitive to the change of elastic modulus,and the surface settlement is more sensitive to the change of cohesion;and(c)the change of inclination of soil-rock interface has a great influence on surrounding rock and surface settlement after rainfall,in which,the surface settlement changes from 5.82 mm at 0° to 37.16 mm at 60°,and the vault settlement changes from 15.77 mm at 0° to 26.17 mm at 60°.The research results can provide reference for route selection and construction control measures of similar projects.