西藏拉洛水利枢纽大坝为沥青混凝土心墙土石坝，泄水建筑物为泄洪隧洞加开敞式溢洪道。多功能泄洪隧洞运用一直是水利工程降低投资的有效措施，但同时需要解决的水力设计难题也是工程设计研究的重点和攻关课题。通过多方案设计与研究，并经水工模型试验验证，确定泄水引水洞采用集导流、泄洪、引水发电、水库放空及拉沙等多用途为一体的型式，并一次建成。这种多功能应用完全结合的泄洪隧洞型式，具有技术新颖、先进、经济效益显著等特点，属国内首创。%The dam of Laluo Hydropower Station in Tibet is an earth-rock one with asphalt concrete core wall and its flood re-lease structures are of flood release tunnel plus open spillway. The application of multi-function flood release tunnel is always an effective measure to reduce the construction investment, but its hydraulic design difficulty to be solved is also the key in the pro-ject design and research. Through design and research for multiple schemes and hydraulic model verification, the flood release tunnel with multiple functions of water diversion, flood release, water diversion for power generation, emptying reservoir and sedi-ment discharge was determined and it would be completed in one stage. The flood release tunnel that integrates all functions is advanced in technology and obvious in economic benefit.
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