STUDY ON LOAD RESISTANCE CAPACITY OF REPAIRED SHIELD TUNNEL

Abstract

 In recent years, deterioration such as rebar corrosion has been reported in shield tunnels for power transmission owned by TEPCO Power Grid, Inc. In this case, there are many cases of repair by the cross-section repair method in order to suppress the progress of deterioration and restore durability. However, there are few past research cases of the cross-section restoration method for the segment, and there were unclear parts about the effect on load resistance capacity. Therefore, they were examined by a loading test on the specimens whose cross-section were repaired by reproducing the segment. As a result of the test, there was a tendency for changes in the behavior of cracks and destruction situations, but no deterioration in load resistance capacity was observed due to cross-section repair method. Therefore, it was decided to calculate and check the bending strength and shear strength of the segment when the cross-section is repaired, as in the case where the cross-section is not repaired.