大朝山水电站尾水调压室设计及优化

大朝山水电站尾水系统采用长尾水隧洞，需设置尾水调压室。经可研、初设、招标、技施设计，对于尾调的形式、水力稳定面积、阻抗孔口尺寸和体形、水力过渡形态、横向水流和立轴漩涡、疏流墩、最高最低渗浪水位及确定的尾水调压室总体高度、洞室衬砌形式、洞室围岩稳定、围岩开挖和支护、结构分析诸问题，逐步深入分析、随设计阶段进展、施工的进程，不断根据新出现的问题，不断根据新出现的问题，跟踪进行修改、优化，做了有益的探索

The optimal design of dam foundation excavation of Dachaoshan Hydropower Station

In the excavation of dam foundation of Dachaoshan Hydropower Station, the principles of seeking truth from facts and closely combining the actual project conditions have been persisted and the optimal design has been continuously conducted. Especially in the excavation of dam sections between No. 10 and No.17, the systematic optimal design was conducted according to the geological conditions and rock features which were uncovered by the excavation in the dam foundation in the right and left banks and the upstream arch cofferdam foundation, and in combination with the characteristics of RCC dam. The actual uncovered rock conditions after the excavation show that a series of the optimal designs are correct. The optimal design of the dam foundation in the river channel not only guarantees the construction of the foundation pit of the project but also saves a great amount of excavation quantities and concrete volume, which gains the obvious construction schedule benefit and economic benefit.