<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-6230</journal-id>
<journal-title><![CDATA[Revista Facultad de Ingeniería Universidad de Antioquia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.fac.ing.univ. Antioquia]]></abbrev-journal-title>
<issn>0120-6230</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-62302023000400069</article-id>
<article-id pub-id-type="doi">10.17533/udea.redin.20200367</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effects of initial stress anisotropy on the onset of undrained instability for Guamo sand]]></article-title>
<article-title xml:lang="es"><![CDATA[Efectos de anistropía inicial de esfuerzos en las inestabilidades no drenadas de la arena Guamo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-Cañón]]></surname>
<given-names><![CDATA[Alfonso Mariano]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prada-Sarmiento]]></surname>
<given-names><![CDATA[Luis Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camacho-Tauta]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Pontificia Universidad Javeriana Departamento de ingeniería Civil ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Ruhr-Universität Bochum Foundations and Geoenvironmental Engineering ]]></institution>
<addr-line><![CDATA[Bochum ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Militar Nueva Granada Departamento de ingeniería Civil ]]></institution>
<addr-line><![CDATA[Bogotá D.C ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<numero>109</numero>
<fpage>69</fpage>
<lpage>78</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-62302023000400069&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-62302023000400069&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-62302023000400069&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Undrained instability is a failure mode that has been observed in many sandy slopes. However, the highly anisotropic stress states caused by the geometry of the slope have not been duly considered from the experimental point of view. This article studies the influence of the initial stress anisotropy of laboratory specimens on the static undrained instability of the Colombian reference sand. Forty-five consolidated undrained triaxial tests were performed, prescribing combinations of different initial void ratios, mean confining pressure, and initial stress ratios. Experimental results allow concluding that: a. the size of the instability zone on the p &#8242; &#8722; q plane becomes smaller for larger initial anisotropic stress ratios; b. a novel undrained instability plane can be proposed in the p &#8242; &#8722; q &#8722; e space to set a boundary between stable and unstable undrained loading conditions; c. mean confining pressure plays a vital role in the estimation of undrained instability for Guamo sand samples under low and medium confining stresses; d. despite multiple factors that influence the onset of undrained instability, a relation can be derived between the undrained instability susceptibility of sandy slopes and the initial stress ratio &#951;0.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La inestabilidad no drenada es un modo de falla que se observa en taludes de materiales granulares. Sin embargo, los altos estados de esfuerzos anisotrópicos inducidos por la geometría del talud han sido considerados marginalmente en los estudios de laboratorio. Este artículo analiza la influencia de la anisotropía inicial de esfuerzos en la inestabilidad estática no drenada para una arena colombiana de referencia. Se desarrollaron 45 ensayos consolidados no drenados controlando diferentes combinaciones de relaciones de vacíos iniciales, presión media de confinamiento y relaciones iniciales de esfuerzos. Los resultados experimentales permiten afirmar que: a. el tamaño de la zona de inestabilidad en el plano p &#8242; &#8722; q se hace más pequeño para relaciones iniciales de esfuerzos más altas; b. se propone un novedoso plano de inestabilidades no drenadas en el espacio p &#8242; &#8722; q &#8722; e, que permite establecer la frontera entre las condiciones estables e inestables para carga no drenada; c. la presión media de confinamiento juega un papel decisivo para la estimación de la inestabilidad no drenada de la arena del Guamo bajo esfuerzos de confinamiento bajos e intermedios ; d. se puede derivar una relación entre la susceptibilidad a la inestabilidad no drenada en taludes granulares y la relación inicial de esfuerzos &#951;0.]]></p></abstract>
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<kwd lng="en"><![CDATA[static liquefaction]]></kwd>
<kwd lng="en"><![CDATA[critical state framework]]></kwd>
<kwd lng="en"><![CDATA[materials testing]]></kwd>
<kwd lng="en"><![CDATA[sands]]></kwd>
<kwd lng="es"><![CDATA[mecánica de suelos]]></kwd>
<kwd lng="es"><![CDATA[clasificación de suelos]]></kwd>
<kwd lng="es"><![CDATA[licuación estática]]></kwd>
<kwd lng="es"><![CDATA[estado crítico]]></kwd>
<kwd lng="es"><![CDATA[ensayo de materiales]]></kwd>
<kwd lng="es"><![CDATA[arenas]]></kwd>
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