Research and Application of Composite Outlet Energy Dissipation Type in Diversion Tunnel
The pre-engineering diversion project in narrow river valley with high water head,high discharge and complex geological condi-tions faces the issue of high speed water discharge,which requires higher energy dissipation body type.Based on hydraulic physics model test,the energy dissipation type at the outlet of diversion tunnel of a hydraulic project was optimized and explored,and four layout schemes including right bank orientation,tunnel line deviation,left bank diversion and forced energy dissipation+left bank diversion were proposed.Through the determination and comparison of hydraulic parameters such as water flow pattern,velocity and erosion characteristics,the com-pound energy dissipation type of forced energy dissipation+left bank diversion was finally recommended,and the adaptability of the recom-mended type to the large and small flow conditions was tested and analyzed throughout the diversion process.The test results show that the composite energy dissipation body type has higher energy dissipation efficiency under each working condition,the flow velocity of cofferdam and left bank near shore is obviously reduced,the dispersed water flow can effectively block backflow,the intensity of water surface fluctua-tion is weakened,the main flow returns to the channel smoothly,the scouring and siltation situation is good and the left bank is protected from scouring.The composite energy dissipation body type can meet the project energy dissipation,safety and stability requirements,and can provide reference for the outlet design of the diversion tunnel project with similar characteristics.
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