Effect of interfacial properties on mechanical stability of ash deposit

作     者：A.Ontiveros-Ortega J.A.Moleon I.Plaza C.Guillén 

作者机构：Department of PhysicsCampus Universitario de las Lagunillas s/nEdificio A-3University of JaénJaén23071Spain Instituto Andaluz de GeofísicaUniversity of GranadaGranada18071Spain Department of GeographyCampus Universitario de Guajara s/nUniversity of La LagunaIslas Canarias38071Spain 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2016年第8卷第2期

页      面：187-197页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：partially funded by two projects:the MEDSUV project from the European Union Seventh Framework Programme(FP7)under Grant No.308665 the Spanish Government(Project CGL2011-29499-C02-01) 

主　　题：Zeta potential Surface free energy Volcanic ash Deposits stability El Hierro Island 

摘      要：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.