TY - GEN
T1 - Tunnel Roof Stability in Soft Rock with Tension Cutoff
AU - Park, Dowon
AU - Michalowski, Radoslaw L.
N1 - Publisher Copyright:
© Springer Nature Singapore Pte Ltd. 2018.
PY - 2018
Y1 - 2018
N2 - Underground structures are exposed to stability issues associated with roof collapse, both during their construction and operation. A major source of uncertainties in tunnels’ roof stability come from the behavior of rock or soil. The Hoek-Brown yield criterion is typically used in analyses when tunnels are constructed in rocks, but in soils and soft rocks the Mohr-Coulomb criterion is more often utilized. However, the tensile strength following from the Mohr-Coulomb criterion may be unrealistic. For that reason, a tension cutoff is proposed, which truncates the yield surface in tensile regime. An analysis of tunnel roof stability in geomaterial with tension cutoff is described in this paper. The kinematic approach of limit analysis is used. Introducing tensile strength cutoff produces nonlinearity in the strength envelope, promoting a multiplicity of admissible roof failure patterns. Stability numbers for an unsupported roof are calculated and support stress is derived that assures stability.
AB - Underground structures are exposed to stability issues associated with roof collapse, both during their construction and operation. A major source of uncertainties in tunnels’ roof stability come from the behavior of rock or soil. The Hoek-Brown yield criterion is typically used in analyses when tunnels are constructed in rocks, but in soils and soft rocks the Mohr-Coulomb criterion is more often utilized. However, the tensile strength following from the Mohr-Coulomb criterion may be unrealistic. For that reason, a tension cutoff is proposed, which truncates the yield surface in tensile regime. An analysis of tunnel roof stability in geomaterial with tension cutoff is described in this paper. The kinematic approach of limit analysis is used. Introducing tensile strength cutoff produces nonlinearity in the strength envelope, promoting a multiplicity of admissible roof failure patterns. Stability numbers for an unsupported roof are calculated and support stress is derived that assures stability.
KW - Limit analysis
KW - Tension cutoff
KW - Tunnel roof stability
UR - http://www.scopus.com/inward/record.url?scp=85163923052&partnerID=8YFLogxK
U2 - 10.1007/978-981-13-0017-2_36
DO - 10.1007/978-981-13-0017-2_36
M3 - Conference contribution
AN - SCOPUS:85163923052
SN - 9789811300165
T3 - Proceedings of GeoShanghai 2018 International Conference: Tunnelling and Underground Construction
SP - 361
EP - 368
BT - Proceedings of GeoShanghai 2018 International Conference
A2 - Zhang, Dongmei
A2 - Huang, Xin
PB - Springer
T2 - 4th GeoShanghai International Conference - Tunnelling and Underground Construction, GSIC 2018
Y2 - 27 May 2018 through 30 May 2018
ER -