龙马水电站导流洞进口渐变段优化设计

The Optimized Design of the Diversion Tunnel Intake Transition Section for Construction of the Longma Hydropower Project

龙马水电站导流洞渐变段由于施工条件限制,结合施工工期、工程结构安全等方面进行系统研究,调整渐变段结构体型,由原浅埋式优化为明洞。为工程的顺利建设和按期投产创造了条件,工程经济效益明显。2007年3月导流洞下闸封堵期间,在93m外水水头直接作用下,渐变段结构安全可靠,没有出现结构破坏和渗漏情况。

The structural configuradon of the transition section of the diversion tunnel for construction of the Longma hydropower project was readjusted and changed into an open cut tunnel from a deeply buffed tunnel after optimization in view of its restricted construction conditions, construction schedule and structural safety, which created favorable conditions for successful completion and commercial operation of the project on schedule, thus bringing about significant economic benefits. The transition structure proved safe and reliable and neither damage nor leakage was found under direct action of an external water head as high as 93m during gate closing and plugging of the ttmnel in March, 2003.