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Effect of interfacial properties on mechanical stability of ash deposit

Journal of Rock Mechanics and Geotechnical Engineering 2016年第2期8卷 187-197页

作者： A.Ontiveros-Ortega J.A.Moleon I.Plaza C.Guillén Department of Physics Campus Universitario de las Lagunillas s/nEdificio A-3University of JaénJaén23071Spain Instituto Andaluz de Geofísica University of GranadaGranada18071Spain Department of Geography Campus Universitario de Guajara s/nUniversity of La LagunaIslas Canarias38071Spain

The paper presents a study on the cohesion of volcanic ash particles using surface free energy determination and zeta potential *** is a subject of great interest in physical volcanology,as many researches on volcanic particle aggregation are frequently *** this case,special attention is paid to the role of structural or hydration forces between hydrophilic surfaces,which are a consequence of the electron-donor/electron-acceptor character of the *** this point of view,the results are potentially interesting as they could give valuable insights into this *** results are presented in terms of the total energy of interaction between dispersed particles,computed from the extended DLVO *** to the total free energy of interaction were determined from the zeta potential and surface free energy of ash,measured under different experimental *** samples of basaltic volcanic ash(black and white)with silica contents of 44% and 63% respectively are *** surface free energy and zeta potential were analysed for ashes immersed in different electrolytes(NaCl,CaCl,FeCl).The presence of electrolytes changes the surface properties of the solid *** analysis of total interaction energy between the ash particles in aqueous medium shows that soil cohesion strongly depends on ash surface properties,chemical nature,the adsorbed cation on the surface,and p H value.

关键词： Zeta potential Surface free energy Volcanic ash deposits stability El Hierro Island

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