Conference paper Embargoed Access

A liquefaction surface to describe liquefaction phenomena in unsaturated sandy soils

Mele, Lucia; Lirer, Stefania; Flora, Alessandro


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    <subfield code="a">Assessment and mitigation of liquefaction potential across Europe: a holistic approach to protect structures / infrastructures for improved resilience to earthquake-induced liquefaction disasters</subfield>
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    <subfield code="a">&lt;p&gt;The energetic interpretation of liquefaction tests indicates that the behavior of unsaturated&lt;br&gt;
sands can be related to the specific energy spent to liquefaction In this paper, an insight&lt;br&gt;
is proposed on the role played by the two components of such a specific energy: the specific&lt;br&gt;
volumetric energy to liquefaction (Ev,liq) and the specific deviatoric energy to liquefaction (Es,liq).&lt;br&gt;
It is argued that Ev,liq (which is nil in saturated soils) can be considered as a state variable to&lt;br&gt;
quantify the increase of cyclic resistance caused by a reduced degree of saturation, being thus&lt;br&gt;
constant along a given cyclic resistance curve. Es,liq is instead related to a specific value of cyclic&lt;br&gt;
resistance ratio or number of cycles at liquefaction via the value of the volumetric component. In&lt;br&gt;
fact, for saturated tests (Ev,liq=0) Es,liq is constant for a fixed number of cycles at liquefaction (Nliq).&lt;br&gt;
For unsaturated tests, Es,liq increases as Ev,liq increases for a given value of Nliq. The three variables&lt;br&gt;
(Ev,liq, Es,liq and Nliq) define a &amp;ldquo;liquefaction surface&amp;rdquo; describing the resistance to liquefaction of&lt;br&gt;
unsaturated soils.&lt;/p&gt;</subfield>
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