拉西瓦水电站进水口优化布置及发电次序调整

Order Regulation of Power Generation and Optimal Layout of the Intake for Laxiwa Hydropower Station

拉西瓦水电站引水发电系统布置在拱坝右岸山体内,原1、2号进水口为低位进水口,原定1、2号机组先发电。但由于地形、地质条件不利,进水口边坡施工比预计的难度大,开挖及支护工程严重滞后,影响了右坝肩开挖关键工期的实现;1、2号引水压力钢管也只能最后安装,影响初期发电的时间。优化设计中调整了机组发电次序,6、5号机先发电,优化了进水口的布置,使右岸坝肩槽开挖工程提前20 d完工;解决了原方案压力钢管的安装顺序与发电次序完全相反的矛盾,使引水系统工程完工时间缩短约6个月,对确保初期发电意义重大。

The water diversion system for the Laxiwa Hydropower Station is arranged in the mountainous body on the right-bank of the Arch Dam. The original intake No.1 ＆ No.2 were designed to be low bottom one and No.1 and No.2 generating units were arranged to be put into generation firstly. The side-slope construction of intake is more difficult than expected one, so that the progress of excavation and support was heavily lagged because of unfavorable terrain and geologic conditions, which affected the excavation progress of right dam abutment and No.1 ＆ No.2 diversion penstocks were installed finally so that the initial power generation time was delayed. In the optimal design, we adjusted the power generation order of units, that is, No.6 and No.5 generating units would be firstly put into generation and optimized the intake arrangement. As a result, the excavation of right dam abutment was completed 20-day ahead of schedule and the contradiction between installation order of penstocks and generation power order in the original design was s01vedi which could shorten about six months to finish the construction of water diversion System and is si ificant for generation power ahead of schedule.