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http://dx.doi.org/10.9720/kseg.2015.2.237

A Study on Dynamic Analyses of Cut and Cover Tunnel during Earthquakes  

Park, Sung-Sik (Kyungpook National University, College of Engineering)
Moon, Hong-Duk (Gyeongnam National University of Science and Technology, Department of Civil Engineering)
Park, Si-Hyun (Korea Infrastructure Safety & Technology Corporation, Inspection Division)
Publication Information
The Journal of Engineering Geology / v.25, no.2, 2015 , pp. 237-250 More about this Journal
Abstract
Underground structures such as a tunnel have been considered as safer than structures on the ground during earthquake. However, severe damages of underground structures occurred at subway tunnel during 1995 Kobe Earthquake and such damages are gradually increased. In this study, a dynamic behavior of a cut and cover tunnel surrounded by weathered soils is investigated using Mohr-Coulomb Model. Parametric study was carried out for boundary conditions, tensile strength, and earthquake magnitudes. The results of numerical analyses in terms of ground deformations and stresses acting on the lining were quite dependent on the side boundary condition (free or fix conditions) and tensile strength of surrounding soils. The ground was deformed upward at the end of earthquake when the side boundary condition was fixed, whereas residual deformations were not predicted when it was free. When the tensile strength of a soil was set to the same as its cohesion, residual deformation was less than 1cm, regardless of side boundary conditions or input accelerations. In addition to that, stress conditions at the maximum deformation and end of earthquake were within an allowable range and considered as safe. Proper boundary conditions and material properties such as tensile strength are quite important because they may significantly impact on the results of dynamic analyses.
Keywords
tunnel; earthquake; boundary condition; tensile strength;
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