Probe into construction method for connecting tunnel between two shield tunnels

A mining construction method being aimed at Beijing region geological condition is brought forward for connecting tunnels based on two shield tunnels.Firstly,part of the shield segments in this maximal connecting tunnel section is taken off and a construction traverse channel is built.Secondly,each part of the connecting tunnel is constructed by regarding the traverse channel as a construction working face.Finally,A numerical simulation with FLAC software is adopted to probe surface subsidence and stratum plastic region distribution after the shield segments being disassembled and the tunnel cross-section being widened.The result indicates that the connecting tunnel between two shield tunnels can be constructed by using mining method;and the construction method is doable to Beijing region geological condition.