Abstract The strata of Chengershan tunnel is mainly consist of the slightly cemented tertiary sandstone, the tun? nel body passes through F2 fault core zone. Geological disasters of mud outburst, sand gushing and extrusion of work face occurred several times during tunnel construction, so the risks are very high. In view of the core zone of F2 fault with high pressure and abundant water, a variety of construction schemes were compared and analyzed in terms of technology, feasibility and safety, and vertical freezing technique was used for stratum reinforcement in the railway tunnel for the first time, furthermore the freezing scheme and tunnel support measures were studied, providing reference and guidance for similar tunnel construction.
Abstract：
The strata of Chengershan tunnel is mainly consist of the slightly cemented tertiary sandstone, the tun? nel body passes through F2 fault core zone. Geological disasters of mud outburst, sand gushing and extrusion of work face occurred several times during tunnel construction, so the risks are very high. In view of the core zone of F2 fault with high pressure and abundant water, a variety of construction schemes were compared and analyzed in terms of technology, feasibility and safety, and vertical freezing technique was used for stratum reinforcement in the railway tunnel for the first time, furthermore the freezing scheme and tunnel support measures were studied, providing reference and guidance for similar tunnel construction.
2018, Vol. 55 