In recent years,there was an increasing number of tunnel construction in our country,and the most critical step of tunnel construction was the selection of construction method,which related to the safety and cost in the tunnel construction,so select the optimal excavation method is very important,and currently there is not a good optimization of highway tunnel construction method,which comprehensively considered the stability and economy.Therefore,according to a tunnel project,three construction methods,including full section method,CD method and CRD method were selected.The displacement,stress and plastic zone were analyzed by numerical simulation,so as to obtain the quantitative index value of stability.Combined with the score of economic related index,the fuzzy analytic hierarchy process was used to calculate the weight,the optimal construction method ultimately obtained is the CD method.The optimization process of construction method considering stability and economy is studied.
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