Study on section optimization of single-hole four-lane highway tunnel with extra-large section
With the rapid development of China's urbanization process,the traditional unidi-rectional two-lane highway tunnel cannot meet the existing transportation demands,and the construction scale of tunnel with extra-large section is increasing day by day.Based on the project of a single-hole four-lane highway tunnel with extra-large section in Shandong Prov-ince,this paper obtains the change regulations of tunnel surrounding rock deformation and supporting structure under 8 different groups of flat ratios and determines the reasonable flat ratios range of the tunnel.The results show that when the flat ratio is located at 0.66-0.70,the force of tunnel section is more balanced,the supporting structure is more stable,and the tunnel excavation cost is lower.In this paper,the optimization method of tunnel with extra-large section can provide references for the internal profile design of highway tun-nel under the same conditions.
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