SOIL AND STRUCTURE INDUCED VIBRATIONS DUE TO HIGH-SPEED TRAINS: BALLAST AND SLAB TRACKS

摘要

Numerical models to obtain ground vibrations induced by the passage of HST, based on finite element method and boundary element method, have been developed in the last years. A few models have been validated, comparing the results obtained from numerical models and those obtained from experimental measurements. Most of these models contain important simplifications, i.e; the ground geometry around the track is not considered or close structures can not be taken into account. Other models only produce the vertical displacements of the ground. In this paper, a three-dimensional non-linear BEM/FEM model based on time domain formulation to solve wave propagation problems is presented. From the proposed numerical model, soil vibrations induced by the passage of HSTs have been obtained in the cases of ballast and slab tracks. Dynamic effects on structures situated near the track have also studied. The numerical results obtained from the proposed model have been compared with in situ measurements performed during the passage of AVE high speed trains on the track between C′ordoba and M′alaga (Spain). The agreement between both sets of results is quite good.