Numerical simulations toward validating undrained conditions in Geotechnical Earthquake Engineering
Fecha
2016
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Universidad EAFIT
Resumen
Liquefaction denotes the loss of shear resistance of granular materials due to pore pressure build up during cyclic load -- Traditionally, liquefaction is considered as an undrained phenomenon -- Consequently, pore-fluid flow is deemed nonexistent during the cyclic response of sandy soils -- This paper aims to shed light on the validity of this hypothesis by examining the response of natural structures made of saturated porous material subjected to vertically incident plane waves -- The two porous structures, i.e., (i) an alluvial basin, and (ii) a surficial topography, are analyzed under single- and double-drainage regimes -- The results are obtained using a dynamic undrained formulation and compared against an u-p scheme -- This work provides evidence on the impact of drainage conditions, incident wavefront, frequency content, and type of natural structure, on the accuracy of the no volumetric change hypothesis -- On particular, our findings show that the undrained approach exhibits a better agreement for interior topography than for surficial irregularities -- Similarly, P-incident wavefronts tend to be better represented for the undrained hypothesis than SV incident waves -- Finally, our results prove that the undrained approximation provides better estimates for single-drainage conditions than for double-flow regimes
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Presión de poro