DAMAGE FACTORS OF THE SEGMENT DURING TUNNELLING IN A LARGE DEPTH SHIELD TUNNEL

Abstract

The design model for load acting on the segment during tunnelling in a shield tunnel is not prescribed clearly. However, it becomes necessary to build the design model because it is very likely that load during tunnelling becomes critical in a large depth tunnel where increase of a plan is anticipated.
Therefore we examined behavior and the stress state of the segment by analyzing measurement of the segment during tunnelling in a large depth tunnel and three-dimensional FEM which simulated a construction step. Based on these results, we presume damage factors of the segment during tunneling and show the opinion for the design for load acting on the segment during tunneling.