山秀水电站二期截流围堰优化设计与施工

Optimal Design and Construction of 2nd Stage Closure Cofferdam at Shanxiu Hydropower Station

山秀水电站二期截流围堰施工措施优化是根据地形、河床覆盖层及水流情况,采用下游围堰作为截流戗堤,龙口留在下游围堰及围堰内闭气方案。科学地利用一、二期围堰拆、填平衡,在水深13.3 m,导流量486 m3/s,下游围堰轴线长151 m的条件下,边抽水边加固闭气体,围堰闭气成功,保证了二期工程的施工按期圆满完成,顺利通过验收。

The optimal construction method of 2nd stage closure cofferdam of Shanxiu Hydropower Station is to adopt downstream cofferdam as closure dike, put the closure opening on the downstream cofferdam and block leakage internally according to the conditions of topography, river bed overburden and water flow. Balance of removal of 1st stage cofferdam and backfill of 2nd stage cofferdam is used scientifically. Under the conditions of 13.3m depth under water, 486m^3/s of diversion discharge and 151m length of axes of cofferdam, the water is pumped at the same time and the leakage is blocked. Finally, the water is pumped out successfully and the 2nd stage construction of the works is ensured to be completed on time and the works are accepted successfully.