Greening design of portal part of tunnel and case analysis

The design of tunnel portal has been turned from simple structure design to an organic combination of structure design and greening design.Based on the general design principle of tunnel portal green,the(design)flow chart,the green methods fitting the portal structure and the landscape,a fundamental combination of portal part structure design and greening design,and the design pattern of greening portal part of tunnel were brought out.The design pattern includes the portal position select,portal structure design,optimizing the green methods,the stability of the slopes,and the effect of landscape design,etc.The coherence of the effect of vegetation and the local environment of tunnel and the artistic conception should be considered when we(design)and construct a program.An example of design of portal part which could be taken as a good reference was given in this paper.