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  Study on Construction Feature of Key Technology for Reconstruction and Extension of Existing Nanling Tunnel

  With the rapid growth of China's economy, people's travel volume and cargo transport volume have increased dramatically. The existing railway has been unable to satisfy the transport standards, so it is urgent to build new tunnels or to rebuild and expand them. Relying on the reconstruction and expansion project of Nanling Tunnel, this paper studies the influence of tunnel passing through existing shafts on surrounding rock in the process of reconstruction and expansion of the tunnel by combining theoretical analysis with numerical simulation, obtains the influence law of tunnel passing through existing shafts on the displacement and stress of surrounding rock, and analyses its mechanism. It provides guidance and reference for similar tunnel reconstruction and expansion projects.

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