RESEARCH ON CONSTRUCTION TECHNOLOGY OF DOUBLE-TRACK HIGH-SPEED RAILWAY TUNNEL CROSSING GIANT KARST CAVE AFTER EXCAVATION AND EXPLORATION
In order to ensure the construction safety of Guinan high-speed railway Jialiang No.3 tunnel crossing the giant karst cave section,the research on the construction technology of double-line high-speed railway tunnel crossing the giant karst cave is carried out.It is proposed to replace the reinforced arch protection+system anchor reinforcement in the cave,and apply strip foundation+steel pipe column retaining wall support outside the cave to ensure that the tunnel is excavated first through the giant karst cave section to ensure that the tunnel is completed on schedule.At the same time,the influence of karst cave on tunnel construction is minimized.The results show that the construction technology effectively ensures the safe and rapid construction of the tunnel across the giant karst cave section.The maximum vault settlement is 8.61 mm,and the maximum clearance convergence is 4.17 mm,which is far less than the deformation control value.It can provide reference for tunnel construction in similar karst areas.
double-track high-speed railway tunnelgiant karst cavedigging first and then exploringfield monitoring
万方数据
维普
