关键词: 引水隧洞, 浅埋段, 覆盖层厚度, 安全评价

Abstract: With the rapid development of pumped storage power stations, high-head hydraulic tunnels have continued to increase, and the operation safety of headrace tunnels has attracted more and more at- tention. Taking the shallow buried section of headrace tunnel in Huizhou pumped storage power station as an example, the main considerations for safety evaluation of shallow buried tunnel are explained re- spectively. The results show that although the shallow buried section of headrace tunnel has problems of broken surrounding rock and slightly insufficient thickness of overlying rock, the minimum principal stress and seepage stability at each control point can meet the requirements, and measures such as en- hanced consolidation grouting have been taken for the surrounding rock during construction process. Therefore, its safety can be guaranteed at present.

Key words: headrace tunnel, shallow buried section, overburden thickness, safety evaluation