有压引水隧洞间岩体厚度的确定

Determination of rock mass thickness between diversion pressure tunnels

结合3个已建的抽水蓄能电站工程(天荒坪、广蓄、沙河)的具体经验,介绍了目前国内确定有压隧洞间岩体厚度的一般做法。探讨了洞间岩体厚度与渗透稳定性的关系。介绍了响水涧抽水蓄能电站有压隧洞间岩体厚度确定的过程以及岩体厚度不足时的防渗工程补充措施,认为隧洞间水力梯度在16以下是安全的。

In combination with some experiences from construction of three pumped storage power stations, i.e. the Tianhuangping power station, the Guangxu power station, and the Shahe power station, the method currently used for determination of the rock mass thickness between pressure tunnels at home was introduced. The relationship between the rock mass thickness and the seepage stability was discussed. Finally, the process for determination of the rock mass thickness at the Xiangshuijian Pumped Storage Power Station was presented, and some remedy measures for the seepage control under the condition of insufficient rock mass thickness were proposed. It is concluded that the hydraulic gradient between pressure tunnels below 16 is safe.