RESEARCH ON KEY TECHNOLOGY OF TUNNEL CONSTRUCTION ACROSS GIANT KARST CAVES
Based on the engineering background of Guinan Gaotie Jialiang No.3 tunnel crossing the giant karst cave section,this study studies the key technology of arch-tunnel integrated structure construction.Firstly,the tunnel body crossing the karst cave section is strengthened with anchor cable.After the advance grouting support is applied in the karst cave area,the tunnel bottom foundation pit is excavated according to the step method,and the independent hoisting equipment is designed to carry out the foundation pit slag soil transportation.Then the arch ring ground model,arch seat and buttress are applied.After pouring the arch ring structure in sections,the arch structure is backfilled in layers,and finally the tunnel secondary lining structure is applied.The results show that the key technology of arch-tunnel integrated structure construction has overcome the technical problems of safe and rapid construction and supporting technology of tunnel crossing giant karst cave,and ensured the construction safety of tunnel crossing giant karst cave.
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