老挝南塔河1号水电站导流隧洞设计

Design of Diversion Tunnel of Nam Tha-I Hydropower Project in Laos

南塔河1号水电站导流隧洞具有洞身断面较大、岩石裂隙较发育、水位变化大、布置场地狭窄等特点。通过对导流隧洞布置、断面形式选择、水力计算、结合施工过程中揭露的实际围岩条件,及时优化支护设计,采用不同的支护方式,既保证了安全,又节省了投资,简化施工程序,加快了施工进度,实现了提前一年截流的节点目标。

The diversion tunnel of t he project is characterized by large section, well developed rock fractures,great changes in water level, and narrow construction site, etc. The support design is timely optimized through the arrangement of tunnel, the selection of section shape, hydraulic calculations as well as the actual conditions of surrounding rock revealed in the construction, which saves the project cost, simplifies the construction procedures, speeds up the construction progress and realizes the closure target a year ahead of schedule.