Study on Structure Design of Generator of Flood Discharge Tunnel with Level Swirling Flow

Heng Zhou,Shengjie Di,Xinlei Guo,Xi Lu,Weiguo Wang,Hui Li,Jing Liu,H Zhang,H Abdul Aziz

doi:10.1051/e3sconf/202127602013

Abstract

Through the design of the Generator of the spillway tunnel, the safe operation efficiency of flood discharge tunnel with the level swirling flow is further improved. This paper takes the horizontal swirl spillway tunnel of Gongboxia Hydropower Station on the Yellow River as an example. First, the project hub facilities of the Gongboxia Hydropower Station are introduced. Moreover, the design of the gradient section and the spinning chamber section in the Generator is also studied. Based on the calculation scheme of structural mechanics, the internal force of the structure under various load combinations such as external water pressure and internal water pressure is calculated. According to Design Codes For Hydraulic Concrete Structure, the structural reinforcement is computed. These provide the basis for the design of the flood discharge tunnel with level swirling flow of large hydropower engineering facilities in Northwest China.

Highlights

Gongboxia Hydropower Station on the Yellow River is the fourth large cascade hydropower station in the upper reaches of the Yellow River after the Longyangxia Hydropower Station, Laxiwa Lijiaxia Hydropower Station(Fig. 1,2)
There are irrigation outlets on the left and right banks. Buildings such as vertical shaft section, generator, cyclone section, plunge pool section and partial backwater section of horizontal cyclone spillway tunnel are located in reservoir area and bear large external water pressure [1,2]
Main loads and combination In this study, the main loads acting on the calculation of the basic system are external water pressure, surrounding rock pressure, internal water pressure and other loads

Summary

Introduction

Gongboxia Hydropower Station on the Yellow River is the fourth large cascade hydropower station in the upper reaches of the Yellow River after the Longyangxia Hydropower Station, Laxiwa Lijiaxia Hydropower Station(Fig. 1,2) It is located at the junction of Xunhua County and Hualong County in Qinghai Province, 25 km from Xunhua County and 153 km from Xining City. There are irrigation outlets on the left and right banks Buildings such as vertical shaft section, generator, cyclone section, plunge pool section and partial backwater section of horizontal cyclone spillway tunnel are located in reservoir area and bear large external water pressure [1,2]. These provide a reference for the design of the generator of a similar spillway tunnel. It is 421 kN/m2 under the Load combination II

The design of the gradient section

Design of Generator

Conclusion