ISSN : 2233-8292
Design analysis for underground spaces requires evaluating stability related to heading collapses. A failure mode is one of the critical factors in the conventional methods of stability evaluation. Identification of failure modes is, therefore, essential in securing safe construction. In this study failure modes at the tunnel heading in cohesionless soils are investigated using physical model tests for various tunnel depths and ground surface inclinations. Test results showed that the effect of depth and the inclination of ground surface on a failure mode are of significance. It is identified that, with an increase in depth, failure modes become localized in a region close to tunnel face. It is also known that an increase in the inclination of ground surface results in inclined and wide failure modes. Numerical simulation of laboratory tests was performed, and shown that the numerical analysis is useful in identifying the heading failure modes, particularly for large underground spaces.
(2001) 화강토지반내 복합막장터널의 파괴메카니즘 연구,
(1994) The Face Stability of Slurry-shield-driven Tunnels,
(1977) . Subsidence above shallow tunnels in soft ground,
(1994) Shallow Tunnels in Cohesionless Soil Stability of Tunnel Face Journal of Geotechnical Engineering,
(1980) The Stability of Shallow Tunnels and Underground Openings in Cohesive Material,
(1996) Safety of New Austrian Tunnelling Method Tunnels-A review of sprayed concrete lined tunnel particular reference to London Clay, HSE
(1981) . Centrifugal testing of model tunnels in soft clay,
(1990) Upper and Lower Bound Solutions for the Face Stability of Shallow Circular Tunnels in Frictional Material,
(1969) Deep Excavations and Tunneling in Soft Ground,