深大竖井的开挖技术在太平江水电站中的应用

Application of deep and big shaft excavation technology in Tai Ping Jiang Hydropower Project

缅甸太平江水电站引水系统中两座深大调压井地质条件复杂,开挖和支护采用了改进的"中导孔+反导井开挖+正向二次扩挖+及时支护"的方法。从技术、安全、质量、进度和经济方面进行了探讨、分析了这一开挖技术的施工工艺和经验。

The water delivery system of TaiPingJiang Hydropower Project in Myanmar is designed with two deep and big surge tanks. Improved method was adopted for excavation and support due to complicated geological condi？tion,incorporating middle guide hole,inverse pilot shaft,forward secondary expansion excavation and timely sup？port. The author discussed and analyzed the construction technique and experience of this excavation method in re？spects of technology,safety,quality ,progress and cost.