Abstract
A qualitative evaluation was made on the safety of tunnel linning, based on the results of measurements made on cross sectional deformation of shield tunnels 10 years or more after their construction. In addition, the study investigated the effects of deformation control of secondary linning on the loads acting on tunnels.
As a result of these studies, the safety of tunnels has been evaluated from estimated stresses based on the assumption that cross sectional deformation of tunnels was caused by vertical loads prodused as a consequence of the ground in areas adjacent to the tunnels. It has also been verified that the effects of deformation control of secondary linning vary greatly, depending on the response coefficient of ground in ereas adjacent to tunnels.
