Analysis of the Influence of Flow Erosion and Centrifugal Force on Small Radius Curve Section of Shield Stormwater Tunnel
At present,there are few literatures about analysis and summarize the impact of flow erosion and cen-trifugal force on the small radius curve section of hydraulic tunnel in China.Therefore,taking the rain and pollution diversion reconstruction project for environmental supervision of Binhai New Area in Tianjin,the shield section pro-ject of the area south of Jintang Highway as an example,the relevant research was carried out.The research results indicate that all the relevant control indicators of the curve section with a radius of 150 m meet the requirements of the specification under the flow erosion with the maximum designed flow velocity of 1.45 m/s;The influence of cen-trifugal force of water flow on the same curve section is smaller which can be basically ignored;The tunnel adopts the overall scheme of C50 high-strength concrete segment+full ring caulking,hand hole and grouting hole sealing+polyuurea coating on the inner surface,which can meet the requirements of water erosion resistance and durability in the whole life cycle of the shield stormwater tunnel.The research results have high reference value for similar projects.
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