Test Study on Navigation in the First Construction Period of Lize Navigation-Power Junction

Based on the test results of Lize navigation-power junction construction diversion through the normal fix-bed model with the scale of 1:100, the navigation flow condition in each construction diversion period is studied. There are a lot of problems in the first construction diversion period, such as excessive flow velocity, poor flow pattern, low navigation discharge and so on. To solve these problems, the comprehensive engineering measures for improving the navigation flow condition during construction are put forward. Among them, the structure forms of construction diversion cofferdam are optimized. Finally, the highest safe navigation discharge and reasonable navigation route are proposed. The experimental results obtained from the optimization scheme of the first construction diversion period are better than these from the original scheme in terms of flow velocity, flow pattern and so on. The research results may serve as reference for similar engineering.

岩溶角砾岩物理力学特性现场试验研究

针对白马航电枢纽采用混凝土重力坝,两岸坝肩分布有岩溶角砾岩,其粒径大小不一,基本呈散粒状、较疏松,且夹有泥质条纹条带,开挖后形成的高陡边坡存在变形稳定问题。本文根据边坡及坝基稳定性分析的需要,对岩溶角砾岩开展了岩体变形试验、直剪强度试验、三轴压缩试验和物理性质试验等一系列的工程岩体试验研究,取得了一系列较完整的试验成果。在此基础上结合工程地质情况,采用工程地质类比法提出了该电站的岩溶角砾岩力学参数试验建议值:变形模量0.05~0.25 GPa,弹性模量0.25~0.50 GPa,抗剪断强度f′为0.4~0.6,c′为0.08~0.3 MPa,抗剪强度f为0.35~0.45。

绣江复航工程白马枢纽省水船闸三维水力特性数值模拟

建立白马枢纽省水船闸三维紊流数学模型,对船闸充水过程的正常运行工况进行数值模拟,分析水力特性以及船舶系缆力,并与相同水力边界条件下的普通单级方案进行对比分析。结果表明,省水方案较普通单级方案,按下一级阀门提前开启的方式,充水时间有所延长,增幅6.7%;3个流量峰值中,1峰和2峰值降幅分别为30.98%、31.6%,3峰值增幅为15.16%;船舶纵向最大系缆力和横向最大系缆力降幅分别为36.25%、44.18%。船闸的水力特性等各项参数均满足规范及设计要求。