大朝山水电站泄洪消能及排沙建筑物设计

大朝山水电站采用表孔和泄洪排沙底孔联合泄洪的泄洪消能方案。中小流量时，以泄洪排沙底孔、冲沙孔和机组泄流为主；中大流量时，则以表孔、泄洪排沙底孔、冲沙孔和机组联合泄流。表孔采用宽尾墩，台阶式坝面和戽式消力池消能工，泄洪排沙底孔和冲沙孔采用窄缝异型挑流消能。新型台阶式坝面对加快碾压混凝土坝的施工进度、节省工程量和提高工程效益具有积极的意义。

Design of flood-releasing energy dissipator and sediment-flushing structure for Dachaoshan Hydropower Station

The flood releasing energy dissipation scheme of combining the surface holes with the flood releasing and sediment flushing bottom holes was adopted in the Dachaoshan Hydropower Station When the flood flow is in the middle and small discharge, the flood releasing and sediment flushing bottom holes, the sand flushing holes and the power generating unit will be jointly used to release flood When the flood flow is in the middle and large discharge, the surface holes, the flood releasing and sediment flushing bottom holes, the sand flushing holes and the power generating unit will be jointly used to release flood The dissipator of surface holes adopted the composite structure of flaring weir, bench dam surface and bucket basin But the flood releasing and sediment flushing bottom holes and the sand flushing holes adopted the narrow ski jump energy dissipator A lot of tests and proofs have showed that new bench dam surface has a positive significance for quickening the RCC construction progress, reducing project quantities and increasing the benefits of the project