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  Study on quick excavation and support method of Expressway Tunnel with 8 lanes in limestone formation

  Jiangshuiquan tunnel, which is 8 lane tunnel with double holes, approximately 3100m in length, 170 to 207 square meters in excavation area, and 80km/h in the design speed, is located in Beijing-shanghai high-speed expressway. In consideration of large scale and tight schedule, a new excavation method named as ”steel-rock wall combined supporting method” is proposed, which is on the basis of CD method and median septum step method, supported temporarily by steel frame and rock wall by which mid-partition in lower bench of the CD method replaced. The three construction methods: CD method, median septum step method and steel-rock wall combined supporting method are compared through numerical analysis, and the result shows that security of the steel-rock wall combined supporting method is sufficient. In addition, the internal force in-situ monitoring of primary support and lining with the method shows that the safety is also satisfied. The steel-rock wall combined supporting method has been applied to Jiangshuiquan tunnel and achieved better results, hoping to provide reference for other similar projects.Key Words: Four lane highway tunnel; Steel-rock wall combined supporting method; Quick construct; Monitoring structure; Safety evaluationThe first segment of Jinan connecting line in Beijing-Shanghai Expressway is 5.38 km, the overall situation shown in Figure 1. Jiangshuiquan tunnel is a full-scale vital project with a length of 3101m and the largest excavation section in the cave is 220m². It is currently the longest bidirectional eight-lane mountain highway tunnel in China.

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