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Tunnel-pile interaction analysis using cavity expansion methods / Alec M. Marshall in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 10 (Octobre 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 10 (Octobre 2012) . - pp.1237–1246. Titre : Tunnel-pile interaction analysis using cavity expansion methods Type de document : texte imprimé Auteurs : Alec M. Marshall, Auteur Année de publication : 2013 Article en page(s) : pp.1237–1246. Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Tunnel  Pile  Cavity  expansion  Soil-structure  interaction  Centrifuge Résumé : Evaluation of the impact of tunnel construction on existing buried structures is an important problem. This paper presents an analytical method for estimating the effect of tunnel construction on end-bearing piles located above the tunnel. The method can be used to estimate the safe relative distance between existing piles and newly constructed tunnels. Spherical and cylindrical cavity expansion/contraction analyses are used to evaluate pile end-bearing capacity and the reduction of confining pressure at the pile tip that results from tunnel volume loss. Pile end-bearing capacity is then reevaluated based on the reduced confining pressure at the pile tip. A modified shear modulus is used to account for the effect of pile installation on soil stiffness. The method is used to analyze centrifuge experiments conducted to study this problem. For the experimental data, where the service load applied to the piles during tunnel volume loss ranged between 50 and 60% of the maximum jacking force, the analytical method showed that pile failure occurred when the load-carrying capacity was reduced below 80% of its original value. A parametric analysis is included that highlights the effect of key soil properties on results. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000709 [article] Tunnel-pile interaction analysis using cavity expansion methods [texte imprimé] / Alec M. Marshall, Auteur . - 2013 . - pp.1237–1246. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 10 (Octobre 2012) . - pp.1237–1246. Mots-clés : Tunnel  Pile  Cavity  expansion  Soil-structure  interaction  Centrifuge Résumé : Evaluation of the impact of tunnel construction on existing buried structures is an important problem. This paper presents an analytical method for estimating the effect of tunnel construction on end-bearing piles located above the tunnel. The method can be used to estimate the safe relative distance between existing piles and newly constructed tunnels. Spherical and cylindrical cavity expansion/contraction analyses are used to evaluate pile end-bearing capacity and the reduction of confining pressure at the pile tip that results from tunnel volume loss. Pile end-bearing capacity is then reevaluated based on the reduced confining pressure at the pile tip. A modified shear modulus is used to account for the effect of pile installation on soil stiffness. The method is used to analyze centrifuge experiments conducted to study this problem. For the experimental data, where the service load applied to the piles during tunnel volume loss ranged between 50 and 60% of the maximum jacking force, the analytical method showed that pile failure occurred when the load-carrying capacity was reduced below 80% of its original value. A parametric analysis is included that highlights the effect of key soil properties on results. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000709