Documents disponibles écrits par cet auteur

Deformations caused by surface loading and tunnelling / K. M. Lee in Géotechnique, Vol. 39 N°1 (Mars 1989) 

Public ISBD [article]  in Géotechnique > Vol. 39 N°1 (Mars 1989) . - pp. 125–140 Titre : Deformations caused by surface loading and tunnelling : The role of elastic anisotropy Type de document : texte imprimé Auteurs : K. M. Lee, Auteur ; R. K. Rowe, Auteur Année de publication : 2007 Article en page(s) : pp. 125–140 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Centrifuge  modelling  Footings/foundations  Flnite  elements  Settlement  Anisotropy  Tunnels Résumé : Elastoplastic finite element analyses were performed to determine the effects of elastic anisotropy on surface settlements caused by a uniform surface loading and by tunnelling. For typical ranges of elastic cross-anisotropic parameters, the effect of anisotropy on settlement induced by surface loading is modest; however, for the case of tunnelling, the effect of elastic anisotropy, in particular the ratio of the independent shear modulus G vh, to vertical modulus E v, should be considered if reasonable predictions of settlement are to be obtained. The practical implications of these find- ings are shown by considering the centrifugal model tunnel tests conducted at Cambridge University. It is found that the anisotropy has a significant effect on the shape of the settlement trough and that reasonable agreement between observa-tion and theory is obtained for G vh/E v, of between 0·2 and O·25, which is smaller thanthe isotropic value of G vh/E v, = 0·33 (for the undrained condition). The reasons for this are discussed. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.1.125 [article] Deformations caused by surface loading and tunnelling : The role of elastic anisotropy [texte imprimé] / K. M. Lee, Auteur ; R. K. Rowe, Auteur . - 2007 . - pp. 125–140. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 39 N°1 (Mars 1989) . - pp. 125–140 Mots-clés : Centrifuge  modelling  Footings/foundations  Flnite  elements  Settlement  Anisotropy  Tunnels Résumé : Elastoplastic finite element analyses were performed to determine the effects of elastic anisotropy on surface settlements caused by a uniform surface loading and by tunnelling. For typical ranges of elastic cross-anisotropic parameters, the effect of anisotropy on settlement induced by surface loading is modest; however, for the case of tunnelling, the effect of elastic anisotropy, in particular the ratio of the independent shear modulus G vh, to vertical modulus E v, should be considered if reasonable predictions of settlement are to be obtained. The practical implications of these find- ings are shown by considering the centrifugal model tunnel tests conducted at Cambridge University. It is found that the anisotropy has a significant effect on the shape of the settlement trough and that reasonable agreement between observa-tion and theory is obtained for G vh/E v, of between 0·2 and O·25, which is smaller thanthe isotropic value of G vh/E v, = 0·33 (for the undrained condition). The reasons for this are discussed. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.1.125

Mechanical properties of cemented scrap rubber tyre chips / W. Y. Tsoi in Géotechnique, Vol. 61 N° 2 (Fevrier 2011) 

Public ISBD [article]  in Géotechnique > Vol. 61 N° 2 (Fevrier 2011) . - pp. 133–141 Titre : Mechanical properties of cemented scrap rubber tyre chips Type de document : texte imprimé Auteurs : W. Y. Tsoi, Auteur ; K. M. Lee, Auteur Année de publication : 2011 Article en page(s) : pp. 133–141 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Compressibility  Stress  analysis  Geosynthetics  Laboratory  tests Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Lightly cemented scrap rubber tyre chips have been proposed as a ductile, porous and lightweight geomaterial for various engineering applications. Both drained and undrained triaxial compression tests on the material were conducted. Despite the high flexibility of the rubber chips and hence their higher ductility, the material behaviour was found to be generally similar to that of typical cemented soils. Data points with the same deviatoric strain in p′–q space were linked up to form a series of equi-deviatoric strain lines, and a degradable cohesion intercept is observed in the plot. There was also a tentative critical state line in p′–q–e space (e being the void ratio) that was consistent with the corresponding ‘parent soil' (unbonded, cement-coated chips). In an unloading–reloading stress–strain curve the unloading path was practically identical to the reloading path in a constant-p′ test, but more curved in a consolidated drained test. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.p.033 [article] Mechanical properties of cemented scrap rubber tyre chips [texte imprimé] / W. Y. Tsoi, Auteur ; K. M. Lee, Auteur . - 2011 . - pp. 133–141. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 61 N° 2 (Fevrier 2011) . - pp. 133–141 Mots-clés : Compressibility  Stress  analysis  Geosynthetics  Laboratory  tests Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Lightly cemented scrap rubber tyre chips have been proposed as a ductile, porous and lightweight geomaterial for various engineering applications. Both drained and undrained triaxial compression tests on the material were conducted. Despite the high flexibility of the rubber chips and hence their higher ductility, the material behaviour was found to be generally similar to that of typical cemented soils. Data points with the same deviatoric strain in p′–q space were linked up to form a series of equi-deviatoric strain lines, and a degradable cohesion intercept is observed in the plot. There was also a tentative critical state line in p′–q–e space (e being the void ratio) that was consistent with the corresponding ‘parent soil' (unbonded, cement-coated chips). In an unloading–reloading stress–strain curve the unloading path was practically identical to the reloading path in a constant-p′ test, but more curved in a consolidated drained test. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.p.033