水布垭水电站溢洪道下游消能防冲防淘墙设计

水布垭水电站溢洪道采用挑流消能,最大下泄流量18 280 m3/s,泄洪落差171 m,泄洪功率3.1万MW.消能冲刷区地质环境复杂,左岸有大岩淌滑坡,右岸有马崖高边坡.岩层以泥盆系写经寺组砂页岩为主,岩性软弱,断裂构造发育,抗冲刷能力低.消能冲刷区采用两岸设置防淘墙而不护底的防护方案.防淘墙结构采取了预应力锚索、锚喷支护和排水等措施.通过计算可以满足防淘墙及其墙后岩体稳定要求.

Downstream anti-scouring wall design for flood spillway of Shuibuya hydropower project

The ski-jump energy dissipation is designed for flood spillway of Shuibuya hydropower project, with maximum discharge of 18 280 m3/s, water fall of 171 m, flood discharge power of 31 thousand MW. The geologic environment in energy dissipation and scouring area is complicated, Dayantang landslide is on the left bank and Maya high sideslope is on the right bank. The strata mainly contains Hsiehchingsu shale of Devonian system and rock feature is soft and weak, fracture structure developed and anti-scouring ability is low. The scheme of constructing scouring wall for both bank but without bottom protection is designed for dissipation area. The technical measures of prestressed anchor cable, anchor shotcrete for support and water drainage etc. are designed for anti-scouring wall. The computation result demonstrates that anti-scouring wall and rock mass behind the wall meet stability requirements.