Abstract: Hydraulic tunnel is an important part of a water conservancy project. Being different from railway tunnel, highway tunnel, mine tunnel and other tunnel projects, for a hydraulic tunnel, its secondary lining concrete is used to bear the pressure of surrounding rock as well as the pressure from the water inside and outside. Based on the current situation of water leakage in hydraulic tunnels of Huanglongtan hydropower station and its hazards, combined with the seepage prevention and plugging works for the water diversion system of unit 4 in the expansion project of Huanglongtan hydropower station, this paper discusses the technology applied to leakage prevention and plugging of hydraulic tunnels, for reference.

Key words: hydraulic tunnel, seepage prevention, reinforcement

摘要： 水工隧洞是水利枢纽的重要组成部分，是以输水为目的的承压隧洞，有别于铁路、公路、矿山等非承压隧道。水工隧洞二次衬砌混凝土除作为围岩压力的承载结构外，还承担着内外水压力。从黄龙滩水电站水工隧洞渗漏水现状和渗漏水对水工隧洞危害出发，结合黄龙滩水电站扩建工程4号机组引水隧洞防渗堵漏工程，探讨水工隧洞防渗堵漏技术，可供其他工程参考。

关键词: 水工隧洞, 防渗堵漏, 补强加固