Mechanical Response Analysis of Pile Foundation Bearing Platform Spanning Structure of Tunnel Across Super Large Karst Cave
In the process of tunnel construction through caves,especially super large karst caves,it is very important to choose a reasonable spanning structure.In this paper,based on FLAC3D finite difference software,the mechanical response of the pile foundation bearing platform spanning structure of a tunnel is studied and its stability is analysed based on the section of a tunnel spanning a super large karst cave.The results show that:the stress of the spanning structure is mainly concentrated in the lower part of the pile foundation and the edge of the bearing platform in the contact area with the surrounding rock,and the strength of the connection between the pile foundation bearing platform structure and the surrounding rock should be further improved;the displacement of the right side of the pile foundation bearing platform structure in the edge area of the bearing platform exceeds the warning value of the safety control indexes,so the monitoring of this area should be strengthened to ensure the safety of the construction and the reinforcing measures should be taken when necessary.
tunnel engineeringsuper large karst cavepile foundation bearing platformnumerical simulationmechanical response
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