Conference paper Open Access

Cyclic simple shear and triaxial tests on Lisbon Region liquefiable sands

Ramos, Catarina; Viana da Fonseca, António; Oblak, Ales; Coop, Matthew

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    <subfield code="u">CONSTRUCT-GEO, Faculty of Engineering of University of Porto, Porto, Portugal</subfield>
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    <subfield code="a">Cyclic simple shear and triaxial tests on Lisbon Region liquefiable sands</subfield>
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    <subfield code="c">700748</subfield>
    <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 Lower Tagus River Valley area, in Lisbon, Portugal, has been studied for having&lt;br&gt;
a high potential liquefaction risk, due to the geological and geomorphological settings and the&lt;br&gt;
seismicity associated to the region. This study focuses on the comparison of the cyclic behaviour&lt;br&gt;
of three sands collected on site, using two distinct laboratory procedures. Tests with different&lt;br&gt;
values of Cyclic Stress Ratio were conducted in both cyclic simple shear and cyclic triaxial testing&lt;br&gt;
apparatus to assess the CRR curves of each material in reconstituted conditions. The comparison&lt;br&gt;
of the results highlights the main differences caused by distinct cyclic loading stress paths especially&lt;br&gt;
in view of the results when inversion or rotation of the principal stresses are induced. The&lt;br&gt;
tests also investigate the influence of the fines content and the cycling frequency in the number&lt;br&gt;
of cycles required for liquefaction to occur, while discussing the criteria for limit/instability level.&lt;/p&gt;</subfield>
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