Study on special tailrace system of Xiangjiaba Hydroelectric Project

摘要

In order to meet the regulation guarantee requirements, and minimize the size of underground cavern complex, the special tailrace system scheme (i.e., roof elevation of the tail-race tunnel will increase with the increase of its length toward downstream and no surge chamber will be arranged) has been adopted for the Xiangjiaba Hydroelectric Project. This paper presents the basic working principle and design philosophy of the special tailrace system, and justifies the viability and rationality of the scheme.