Study on the treatment materials of urban rail transit water-containing caves

Abstract

With the sustained and rapid development of the national economy and the accelerating urbanization process, the contradiction between urban basic design, especially urban transportation facilities and urbanization, has become increasingly prominent. Rail transit has become the main public transport in major cities with its advantages of large capacity, fast speed, safety and reliability, and on-time comfort. Most of the rail transit lines are underground tunnels. When the tunnel crosses the karst area, it may encounters caves with different sizes, different locations, different filling levels and different water content. The existence of these caves will seriously affect the surrounding rock in tunnel construction. To carry out research on the typical disaster of water-filled caves, different types of filling materials were compared and analysed. And the applicable scope, advantages and disadvantages of various filling materials were also analyzed. Aiming at the treatment method of cement-water glass as filling material for the water-soluble cave, the relationship between the setting time of cement-water glass and the water inflow time was studied. The research shows that the effect of injecting the cave near the cement-water glass is the best.