ANALYSIS OF THE POSSIBLE CRACKING AND DAMAGES OF TUNNEL LINING SEGMENTS DURING INSTALLING STAGE

摘要

Tunnel lining segments can crack or sustain fractures at different stages. It will then affect the stability and structure of the tunnel construction process. Segments are mainly loaded during the installation stage. The main objective of this research is to identify the main factors in the creation of cracks and chipping in segments during the installation stage. By analyzing the collected data, the causes of cracking are investigated such as excessive forces of the TBM jacks, joint dislocation (offset), spacing (gap) in the segmental ring, and defects of the support conditions. Using a statistical analysis of the field data, the interpretation of these causes is discussed. In addition, numerical results are presented to validate the effect of jacking forces on the segments.