000022153 001__ 22153
000022153 005__ 20170622145959.0
000022153 04107 $$aeng
000022153 046__ $$k2015-05-25
000022153 100__ $$aRuiz, J. Fernández
000022153 24500 $$aTHE INFLUENCE OF DEGRADATION OF SHEAR MODULUS OF SOIL ON PREDICTED RAILWAY VIBRATIONS IN TUNNELS EXCAVATED WITH TBM: A NUMERICAL ANALYSIS

000022153 24630 $$n5.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022153 260__ $$bNational Technical University of Athens, 2015
000022153 506__ $$arestricted
000022153 520__ $$2eng$$aIn this paper the influence of the stress state within the soil on predicted railway vibrations in tunnels is studied, regarding Gs modulus degradation that occurs when the tunnel is excavated with Tunnel Boring Machine (TBM). The adopted procedure is uncoupled, using a 2D FEM model to simulate the process of tunnelling which incorporates the constitutive model known as Hardening Soil with small strain stiffness (HS-small). The Gs modulus values are then used in a dynamic numerical model based on a 2.5D FEM-PML approach in order to simulate the vibrations induced by railway traffic. Simulations are then performed assuming two different scenarios for the elastic properties of the ground: i) assuming Gs modulus for low strain deformation for whole domain, i.e., neglecting the perturbation of the soil due to the tunnel construction; ii) assuming values of Gs modulus computed taking into account the strains induced by the tunnel construction. The numerical results show a clear influence of tunnelling process, being more relevant at closest distances to the tunnel.

000022153 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022153 653__ $$aRailway vibrations in tunnels, Gs soil degradation due to TBM

000022153 7112_ $$aCOMPDYN 2015 - 5th International Thematic Conference$$cCrete (GR)$$d2015-05-25 / 2015-05-27$$gCOMPDYN2015
000022153 720__ $$aRuiz, J. Fernández$$iRodríguez, L. Medina$$iLopes, P.$$iCosta, P. Alves
000022153 8560_ $$ffischerc@itam.cas.cz
000022153 8564_ $$s763834$$uhttps://invenio.itam.cas.cz/record/22153/files/C1344.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
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000022153 962__ $$r22030
000022153 980__ $$aPAPER