TB水电站导流隧洞洞径优化分析

Optimization Analysis of Diversion Tunnel Diameter of TB Hydropower Station

TB水电站工程具有坝体高、库容大、导流流量大、蓄水历时长等特点,通过分析研究,初期导流采用河床一次断流、土石围堰挡水、隧洞泄流、坝体全年施工的导流方案。受地质条件影响,导流隧洞靠山侧布置,洞线较长,由于洪峰来量大,导流隧洞断面也比较大,断面尺寸的选择直接影响工程施工总进度和工程投资。通过对TB导流隧洞洞径进行优化分析,达到加快进度、降低工程投资的目的。

TB hydropower station project has the characteristics of high dam height,large storage capacity,large diversion flow,and long water storage duration.Through analysis and research,the initial diversion adopts a diversion scheme of one-time riverbed interruption,soil and rock cofferdam water blocking,tunnel discharge,and year-round construction of the dam body.Due to geological conditions,the diversion tunnel is arranged on the mountain side with a longer tunnel line.Due to the large volume of flood peaks and the relatively large section of the diversion tunnel,the selection of section size directly affects the overall construction progress and investment of the project.By optimizing and analyzing the diameter of the TB diversion tunnel,the goal of accelerating progress and reducing engineering investment can be achieved.