洛宁抽水蓄能电站引水斜井TBM施工关键技术研究

Study on Key Technology of TBM Construction for Diversion Inclined Shaft of Luoning Pumped-storage Power Station

通过分析河南洛宁抽水蓄能电站工程特点及相关地质条件,梳理得到了引水斜井采用TBM施工的关键技术问题,研究提出了洛宁抽水蓄能电站引水斜井应用TBM的布置方案。综合考虑隧洞功能要求、支护及衬砌厚度、围岩变形量等因素,将引水斜井开挖直径确定为7.2 m,在高水头的抽水蓄能电站推广适用性较好。综合考虑TBM施工方法对围岩分类评价体系的影响、TBM设备支护能力、规程规范要求以及参考类似工程经验,初步拟定了洛宁电站引水斜井开挖支护参数。

Based on the analysis of the engineering characteristics and related geological conditions of Luoning Pumped-storage Power Station in Henan Province,the key technical problems of TBM construction of diversion inclined shaft are summarized,and the layout scheme of TBM construction for the diversion inclined shaft are studied and put forward.Considering the tunnel function requirements,support and lining thickness,and surrounding rock deformation,the excavation diameter of diversion inclined shaft is determined as 7.2 m.It is found that the 7.2 m excavation diameter is suitable for the high head pumped-storage power station.Considering the influence of TBM construction method on surrounding rock classification evaluation system,TBM equipment support capacity,specification requirements and similar engineering experiences,the excavation support parameters of diversion inclined shaft of Luoning Pumped-storage Power Station are preliminarily determined.