摘要
Abstract
In order to reduce the impact of small clear distance highway tunnel excavation on the surface settlement,this paper takes a tunnel project in Sichuan province as an example,establishes a tunnel model through monitoring and finite element software MADIS-GTS NX,and analyzes the influence of the reinforcement form of medium rock column on the tunnel settlement deformation characteristics.The results show that the surface settlement of the first excavation is larger than that of the second excavation.The maximum surface settlement under deep bur-ied condition is 2.21 times higher than that under shallow buried condition.The surface settlement-distance curve from the starting point of the monitoring section presents a W shape.With the increase of the reinforcement thickness and the decrease of the diameter of the middle rock column,the amount of surface settlement increases continuously.In conclusion,the influence of tunnel excavation on surface settlement can be effectively reduced by increasing the diameter of medium rock column.关键词
公路隧道/小净距/岩柱/MADIS-GTS NX/隧道模型/地表沉降量Key words
Highway tunnel/Small clear distance/A rock pillar/MADIS-GTS NX/Tunnel model/Land surface settlement分类
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