深圳抽水蓄能电站高压岔管围岩特征与针对性处理

Surrounding rock characteristics of high pressure bifurcated pipe and corresponding treatment for Shenzhen pumped storage power station

抽水蓄能电站高压岔管采用钢筋混凝土衬砌时,超高内水压力主要由围岩承担,要求围岩具备足够的自承能力,因此高压岔管位置多选择在完整的Ⅰ、Ⅱ类围岩内。但由于地质体各向异性,常出现不可预见的不良结构面构造,导致岩体局部强度降低。以深圳抽水蓄能电站高压岔管为例,通过相关岩体试验对高岔部位围岩特征进行了勘察复核,并对出现的不利结构面从工程措施上进行了针对性处理。电站运行后监测结果表明,地质勘察手段和围岩处理方法是可行的。

When the high pressure bifurcated pipe of a pumped storage power station is designed with reinforced concrete lining, the extra-high internal water pressure is mainly borne by the surrounding rock, so the surrounding rock is required to have sufficient self-supporting capacity, and the high pressure bifurcated pipe is mostly accommodated by complete surrounding rock of class I or class II. However, unforeseeable unfavorable structural surface is frequently seen due to anisotropy of geological body, which leads to rock strength is low locally. Taking Shenzhen pumped storage power station as example, rock experiment was carried out to confirm the characteristics of rock surrounding the high pressure bifurcated pipe, based on which engineering measures were designed corresponding to the unfavorable structural surface. Monitoring data after the power station was put into operation proves the geological investigation method and treatment measures are feasible.