Study on Grouting Reinforcement Method under Soft Water-rich Sand Layer in Metro Station

The Quaternary water-rich sand layer, which is often traversed during the construction of subway tunnels, is one of the main geological disaster sources that affect the safety of subway construction. The formation is rich in water, low in bonding strength, and has poor self-stability. It is very easy to induce engineering disaster accidents such as tunnel collapse, water gushing and sand collapse. Grouting method is the most commonly used method to control geological hazards of water-rich sand layer. Grouting can effectively enhance the cohesion of the sand layer and enhance the compressive strength of the sand layer. This article mainly aims at the subway station passing through the sand layer, adopts the advanced curtain grouting method, and cooperates with the specific grouting technology to grouting the sand layer within 12m in front of the tunnel to ensure the stability and safety of tunnel excavation.