Dynamic behaviors of corrugated steel plate structures in open-cut tunnels

This research focuses on this soil-steel composite mechanism of CSPS. The results form conventional equations, computational analysis and model tests were cross checked with the variations in the following factors, such as the height of cover according to earthquake loads, open-cut slope inclination, degree of compaction, spacing between CSPS supports in order to examine the safety and dynamic behaviors of CSPS linings. From the results of earthquake response spectrum according to CSPS support spacing, there were little or no differences in compression forces but as spacing between the supports decreases the moment and shear forces increased. Canadian Highway Bridge Design Code (CHBDC) was used as the conventional equation. The results from the earthquake analysis using CHBDC were compared with the results form the dynamic time dependent on time history analysis. The comparison showed that even though the CHBDC results were relatively smaller than the time history analysis, the difference was minimal. The results from seismic displacement method and Mononobe-Okabe method showed that the increase in the height of cover increases extremely the compression stresses, showing different results from the CHBDC and dynamic time history analysis results. The differences in the results are caused from not considering the restraining effects of the surrounding soil and just implementing the dynamic soil pressures and the ground relative displacement in the analysis. In order to verify the results of this research, a 1/40 scale static model chamber test and dynamic shaking table test were carried out. The results from the tests showed similar trend to the results of the analyses. (A) This paper was presented at Safety in the underground space - Proceedings of the ITA-AITES 2006 World Tunnel Congress and the 32nd ITA General Assembly, Seoul, Korea, 22-27 April 2006. For the covering abstract see ITRD E129148. "Reprinted with permission from Elsevier".