Modelling of propagation with SPH of 1966 aberfan flowslide: special attention to the role of rheology and pore water pressure

PAOLA DUTTO; M. MARTIN STICKLE; D. MANZANAL; M. PASTOR; ÁNGEL YAGUE

Barcelona

Conferencia; COMPLAS XIII : proceedings of the XIII International Conference on Computational Plasticity : fundamentals and applications; 2015

CIMNE

Landslides can cause major economic damage and a large number of casualties asitispossibletoseefrompasteventsoccurredallovertheworld.Beingabletopredictthesekindofhazardswouldthensupposetheachievementofgreatbenefits.Hereamodelthatcombinesadepthintegrateddescriptionofthesoil-porefluidmixturetogetherwithasetof1Dmodelsdealingwithporepressureevolutionwithinthesoilmassispresented.ThemathematicalmodelisbasedontheBiot-Zienkiewiczequations,fromwhereadepthaveragedmodelisderived.Concerningthematerialbehaviour,theapproachusedistheonesuggestedbythePerzynaviscoplasticity,whichhasbeenextensivelyusedinthepasttomodelsolidbehaviourpriortofailure.Inthisframework,asimpleshearrheologicalmodelisderived,providingthebasalfrictionneededindepthintegratedmodels.TheSmoothedParticleHydrodynamics(SPH)hasbeenthenumericaltechniquechosentospatiallydiscretisedthedepthintegratedequationsofthemathematicalmodel.ThepurposeofthisworkistoapplytheSPHdepthintegratednumericalmodel,togetherwiththesub-modelthatpredictstheevolutionoftheporewaterpressureinsidethelandslide,tosimulatethepropagationphaseoftheAberfanflowslideoccurredin1966.151