马来西亚巴贡水电站导流洞封堵设计计算

Plugging design calculation of diversion tunnels for Bakun hydropower project

水工隧洞封堵堵头是水工建筑物的重要组成部分。经过几十年的探索和实践,设计人员对封堵堵头的受力机理已有了深刻地认识,堵头并不完全是靠基础面的剪摩作用维持平衡。经过对堵头前端扩挖并进行灌浆等处理后,堵头在水荷载作用下实际上是一个四周受围岩约束的刚体,它的超载能力很强。通过对马来西亚巴贡水电站导流隧洞堵头及围岩三维有限元计算,大大缩短了堵头的长度,节约了工程投资。

The choke plug of diversion tunnels is an important part of hydraulic structures. By several decades of exploration and practice, the designer has profound acquaintance with stressing mechanism of choke plug that does not rely on shear force to maintain the balance. After enlarged excavation in front of the plug and be grouted, the plug under water load is actually a rigid body restrained by the surrounding rock. By the calculation of choke plug and rock mass with 3-D finite element method, the length of plug is greatly shortened, and the project cost is saved.