Abstract:

Due to the serious damages of the cutting tools of the shield machine after longdistance boring in sand layers, as well as the hardsoft heterogeneous ground conditions in the portion of the tunnel, it would be of great difficulty for the shield machine to drive through the tunnel portion. On basis of the comprehensive evaluations on the requirements of the construction schedules and the feasibility of various connection alternatives, the alternative of mined tunnel is determined to be adopted. The article presents the construction technology of the connection portion between the shielddriven tunnel and the mined tunnel in detail.

Key words: shielddriven tunnel mined tunnel  , countermeasure