Research on Key Technology of Tunnel Widening,Excavation and Support Construction
With the rapid development of the economy,"old"tunnels are increasingly unable to meet the requirements of modem transporta-tion,and the widening and reconstruction of tunnels is becoming urgent.Taking the Xiangshan Tunnel in Fuzhou as an example,combined with the tunnel geology and surrounding environment,the tunnel widening and reconstruction scheme of four-arch tunnel widening by new-ly built double-hole and double-layer tunnel is proposed.The key and difficult work of the tunnel widening scheme is studied and ana-lyzed,and the key construction technology of tunnel widening is studied.It provides experience and guidance for the updating of"old"tun-nel widening and reconstruction projects.
"old"tunnelsdouble-hole and double-layer tunnelwidening and reconstructionconstruction technology
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