某水电站引水隧洞上平段围岩分类及支护优化

洞室围岩的分类直接关系到围岩支护工程量和施工工期,根据开挖揭示情况,及时对洞室围岩进行研究,优化设计方案十分必要。依据某水电站引水隧洞上平段岩性、构造、地下水等工程地质条件,对岩体围岩进行分类,结合施工地质工作,做出合理的最终地质鉴定,并及时反馈修正岩体类别与地质参数,为现场修改、优化设计提供可靠的计算依据,节省了永久衬砌及临时支护工作量,节省工期6个月。经过几次过水试运行,引水隧洞运行情况良好,证明引水隧洞上平段支护优化方案是科学、合理的。

Wall Rock Classification and Support Optimization of Diversion Tunnel in a Hydropower Station

The classification of the wall rock in the diversion tunnel is directly related to support quantity and the construction progress,from the analysis of the tunneling methods producing,research of wall rock on time,it is necessary to optimize the design.According to engineering geological conditions including lithology,structure and groundwater,wall rock is classified.Basis on the date in construction geological,the authors keen to make a reasonable final geological identification,and give revise classifications of the wall rock and parameters on time.It supplies the credibility calculation basis in the optimization design,saves the permanence supply and the temporary,and shortens the work period of six months.According to some times’ work of water-carrying,the draw water tunnel works well,it is proved that plans of support optimization are scientific and reasonable in diversion tunnel.