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http://dx.doi.org/10.9711/KTAJ.2021.23.1.037

Assessment of tunnel stability according to height of embankment by numerical analysis  

Lee, Kang-Hyun (Korea Expressway Corporation Research Institute)
Lee, Sangrae (Korea Expressway Corporation Research Institute)
Kim, Nag-Young (Korea Expressway Corporation Research Institute)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.23, no.1, 2021 , pp. 37-45 More about this Journal
Abstract
The construction of the tunnel portal should be careful because cover depth is shallow and it is difficult to exhibit the arching effect. Tunnel stability may be reduced with additional embankment above the portal of tunnel. In this study, in order to examine the stability of the tunnel according to additional embankment above the portal of tunnel, numerical analysis was performed while changing the ground conditions and height of embankment. As a result of the numerical analysis, it was found that the allowable flexural compressive stress of shotcrete and allowable axial force of rockbolts were exceeded when the height of additional embankment was 12 m in rock mass rating V. When considering the displacement, the range of the plastic region and the behavior of the support materials, the tunnel stability seems to be greatly reduced if the height of additional embankment above the portal of tunnel exceeds 10 m.
Keywords
Tunnel; Stability; Cover depth; Height of embankment;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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