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A platform for research: civil engineering, architecture and urbanism
Upper-bound analysis on the face stability of a non-circular tunnel
AbstractThe present paper is devoted to the estimation of the safety factor of a tunnel face with a non-circular section using the upper-bound limit analysis in combination with the strength reduction technique. Thanks to the spatial discretization technique, an advanced 3D rotational collapse mechanism is extended to generate a failure mechanism for a non-circular tunnel face. The computed results are compared to 3D numerical calculations for a full face excavation as well as for a top heading excavation (a horseshoe shaped tunnel), showing a good agreement. A comparison with other approaches indicates that the presented approach gives conservative results and should be used for the safety factor assessment in the practical design. The effect of the cross-sectional tunnel shape on the safety factor is also discussed.
Upper-bound analysis on the face stability of a non-circular tunnel
AbstractThe present paper is devoted to the estimation of the safety factor of a tunnel face with a non-circular section using the upper-bound limit analysis in combination with the strength reduction technique. Thanks to the spatial discretization technique, an advanced 3D rotational collapse mechanism is extended to generate a failure mechanism for a non-circular tunnel face. The computed results are compared to 3D numerical calculations for a full face excavation as well as for a top heading excavation (a horseshoe shaped tunnel), showing a good agreement. A comparison with other approaches indicates that the presented approach gives conservative results and should be used for the safety factor assessment in the practical design. The effect of the cross-sectional tunnel shape on the safety factor is also discussed.
Upper-bound analysis on the face stability of a non-circular tunnel
Pan, Qiujing (author) / Dias, Daniel (author)
Tunnelling and Underground Space Technology ; 62 ; 96-102
2016-11-26
7 pages
Article (Journal)
Electronic Resource
English
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