天花板水电站导流隧洞设计

Diversion Tunnel Design for Tianhuaban Hydropower Station

天花板水电站导流隧洞具有洞身断面较大、运行时间长、水位变幅大、布置场地狭窄等特点。通过对导流隧洞布置、断面形式选择、封堵堵头和进出口明渠的设计进行分析,结合施工过程中揭露的实际围岩条件,及时优化支护设计,采取了不同的支护方式。导流隧洞经过3个汛期洪水的考验,无大的损坏,导流隧洞设计合理。

The diversion tunnel in Tianhuaban Hydropower Station has a larger section, a longer operation period, a wider operation head and a limited arrangement area. The layout of diversion tunnel, the selection of section type and the designs of bulkhead and open channels in the inlet and outlet sections are analyzed, and the supporting design is optimized and different supporting are adopted after considering the actual surrounding rock conditions revealed in the excavation. After discharging flood in three flood seasons, the tunnel has no serious damage, and shows that the design is reasonable.