Research on Preventive Measures for Water and Mud Inrush Disasters in Highly Weathered Granite Super Large Section Tunnel
When tunnels pass through strongly weathered granite formations,disasters such as water and mud bursts are prone to occur,seriously affecting the safety of tunnel construction.The Xiamen Second West Passage project was taken as the research object,and advanced geological prediction methods were used to predict unfavorable geology.Among them,the BZK15+270—BZK15+300 section is located in a fragmented strongly weathered granite formation with strong permeability and poor self stability.Aiming at the construction difficulties of tunnel passing through F6 weathering trough,a combined advanced support method of long pipe shed and half section curtain grouting is proposed,and the effectiveness of curtain grouting measures is verified based on the inspection hole status,grouting amount,grouting pressure and grouting rate.
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