华安水电站扩建工程引水隧洞塌方处理技术

Treatment Technology for the Collapse of Diversion Tunnels in the Expansion Work of Hua'an Hydropower Station

为解决华安水电站扩建工程引水隧洞施工过程中的塌方问题,对其塌方的特点及成因进行了研究,提出了搞好隧洞初期支护、把握好穿越塌方体施工的过程、采用深层固结灌浆提高围岩稳定性等措施,经过施工期的安全监测和一年运行观测,该洞段围岩稳定,表明措施有效。

In the expansion work of Hua ’ an Hydropower Station, collapse accidents are encountered during the con-struction of the diversion tunnels.Characteristics and possible causes of the collapse accidents are investigated.Treat-ment measures are then proposed, such as the good primary support, the proper construction procedure through the col-lapse rock, the deep consolidation grouting to increase the stability of surrounding rocks.Safety monitoring in the con-struction period and one-year’ s operation shows that the tunnel surrounding rocks are now stable, which illustrates the effectiveness of the proposed measures.