充填混凝土超前支护在三四沟水电站隧洞塌方处理中的应用

Application of Filling Concrete as Advanced Support Method in the Treatment Plan of Tunnel Collapse at Sansigou Hydropower Station

以三四沟水电站隧洞塌方处理方案为例,阐述了利用塌方渣体作为支撑、采用泵送混凝土对隧洞塌方空腔进行一定厚度充填的方式以减小塌方腔体、约束塌体周边围岩变形并在隧洞上部形成封闭,最终起到超前支护的作用,进而为保证隧洞内塌方体的处理及后续隧洞的支护工作提供安全操作空间,所取得的经验可为类似隧洞塌方处理方案的选择借鉴。

Taking the tunnel collapse treatment plan of Sansigou Hydropower Station as an example,the article explains how to use the collapsed slag body as a support and use pumped concrete to fill the collapsed cavity of the tunnel with a certain thickness to reduce the collapsed cavity,restrain the surrounding rock around the collapsed cavity,and form a closure in the upper part of the tunnel which ultimately plays the role of provide advanced support,thereby,providing a safe operating space for ensuring the treatment of the collapsed body in the tunnel and subsequent tunnel support work.And it may provide reference for the selection of similar tunnel collapse treatment plans.