Site Characterization and Laboratory Testing of Unsaturated Quartz Sand Under Cyclic Loads
Fine-grained sand deposits in subtropical regions are valued for their low settlement percentages, providing high load-bearing capacity for foundations. Despite existing literature, certain behaviors of these deposits, particularly under cyclic loading in unsaturated conditions with stiffness contro...
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Veröffentlicht in: | Geotechnical and geological engineering 2024-07, Vol.42 (5), p.4001-4021 |
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creator | Baldovino, Jair de Jesús Arrieta Filho, André Luiz Delmondes Futai, Marcos Massao Mera, Mateus |
description | Fine-grained sand deposits in subtropical regions are valued for their low settlement percentages, providing high load-bearing capacity for foundations. Despite existing literature, certain behaviors of these deposits, particularly under cyclic loading in unsaturated conditions with stiffness control, still need to be better understood. Given the potential for shaft friction degradation in cyclically loaded axial piles, this gap is critical. This paper comprehensively investigates the mechanical properties of PE-Sand from a Southern Brazil deposit under cyclic loads, integrating laboratory and field analyses. Characterization involved granulometric, specific gravity, consolidation, matric suction, microscopic, mineralogical, and chemical tests. Uncommon unsaturated direct shear tests were performed, evaluating shear interface degradation under one-way and two-way cyclic loads. Standard penetration and seismic piezocone tests at 25m depth contrasted field properties. Findings identified uniform micaceous quartz sand. A novel conceptual model for PE-sand cohesion emerged from stiff-direct shear tests. Cyclic tests revealed heightened interface degradation with fewer cycles at increased load amplitudes. Fatigue results converged to a cumulative damage value, signifying material criticality limiting sand-sand interface resistance. Field exploration confirmed a heterogeneous sand deposit with geotechnical properties akin to laboratory findings. This study contributes nuanced insights into fine sand behavior under cyclic loading in unsaturated conditions, bridging gaps in existing knowledge. |
doi_str_mv | 10.1007/s10706-024-02769-6 |
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Despite existing literature, certain behaviors of these deposits, particularly under cyclic loading in unsaturated conditions with stiffness control, still need to be better understood. Given the potential for shaft friction degradation in cyclically loaded axial piles, this gap is critical. This paper comprehensively investigates the mechanical properties of PE-Sand from a Southern Brazil deposit under cyclic loads, integrating laboratory and field analyses. Characterization involved granulometric, specific gravity, consolidation, matric suction, microscopic, mineralogical, and chemical tests. Uncommon unsaturated direct shear tests were performed, evaluating shear interface degradation under one-way and two-way cyclic loads. Standard penetration and seismic piezocone tests at 25m depth contrasted field properties. Findings identified uniform micaceous quartz sand. A novel conceptual model for PE-sand cohesion emerged from stiff-direct shear tests. Cyclic tests revealed heightened interface degradation with fewer cycles at increased load amplitudes. Fatigue results converged to a cumulative damage value, signifying material criticality limiting sand-sand interface resistance. Field exploration confirmed a heterogeneous sand deposit with geotechnical properties akin to laboratory findings. 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Despite existing literature, certain behaviors of these deposits, particularly under cyclic loading in unsaturated conditions with stiffness control, still need to be better understood. Given the potential for shaft friction degradation in cyclically loaded axial piles, this gap is critical. This paper comprehensively investigates the mechanical properties of PE-Sand from a Southern Brazil deposit under cyclic loads, integrating laboratory and field analyses. Characterization involved granulometric, specific gravity, consolidation, matric suction, microscopic, mineralogical, and chemical tests. Uncommon unsaturated direct shear tests were performed, evaluating shear interface degradation under one-way and two-way cyclic loads. Standard penetration and seismic piezocone tests at 25m depth contrasted field properties. Findings identified uniform micaceous quartz sand. A novel conceptual model for PE-sand cohesion emerged from stiff-direct shear tests. Cyclic tests revealed heightened interface degradation with fewer cycles at increased load amplitudes. Fatigue results converged to a cumulative damage value, signifying material criticality limiting sand-sand interface resistance. Field exploration confirmed a heterogeneous sand deposit with geotechnical properties akin to laboratory findings. This study contributes nuanced insights into fine sand behavior under cyclic loading in unsaturated conditions, bridging gaps in existing knowledge.</description><subject>Bearing capacity</subject><subject>Chemical tests</subject><subject>Civil Engineering</subject><subject>Cumulative damage</subject><subject>Cyclic loading</subject><subject>Cyclic loads</subject><subject>Degradation</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Earthquake damage</subject><subject>Exploratory behavior</subject><subject>Geotechnical Engineering & Applied Earth Sciences</subject><subject>Hydrogeology</subject><subject>Laboratory tests</subject><subject>Loads (forces)</subject><subject>Materials fatigue</subject><subject>Matric suction</subject><subject>Mechanical properties</subject><subject>Original Paper</subject><subject>Quartz</subject><subject>Sand</subject><subject>Shaft friction</subject><subject>Shear</subject><subject>Shear tests</subject><subject>Soil properties</subject><subject>Specific gravity</subject><subject>Suction</subject><subject>Terrestrial Pollution</subject><subject>Waste Management/Waste Technology</subject><issn>0960-3182</issn><issn>1573-1529</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNp9kE9LxDAQxYMouK5-AU8Bz9VJ0ibtUYr_oCCyuxcvYdqma5e1WZP0sPvpzVrBm4dhhuG9mcePkGsGtwxA3XkGCmQCPI2lZJHIEzJjmRIJy3hxSmZQSEgEy_k5ufB-AwBcApuR90UfDC0_0GETjOsPGHo7UBxaWmFtHQbr9nRpfOiHNbUdXQ0ewxj3pqVvI7pwoIujejW0xtFy32z7hlYWW39JzjrcenP12-dk-fiwLJ-T6vXppbyvEuSFCIkyMVbW1qbhGUIreVvUGEcuayayXMUV61QHteI5gzzvYnbGjEnRyBRyMSc309mds19jDKo3dnRD_KgFKJFKGQlEFZ9UjbPeO9Ppnes_0e01A31EqCeEOiLUPwi1jCYxmXwUD2vj_k7_4_oGXYFzjA</recordid><startdate>20240701</startdate><enddate>20240701</enddate><creator>Baldovino, Jair de Jesús Arrieta</creator><creator>Filho, André Luiz Delmondes</creator><creator>Futai, Marcos Massao</creator><creator>Mera, Mateus</creator><general>Springer International Publishing</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TN</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><orcidid>https://orcid.org/0000-0002-0485-8456</orcidid><orcidid>https://orcid.org/0000-0002-4969-3085</orcidid><orcidid>https://orcid.org/0009-0006-7702-6964</orcidid><orcidid>https://orcid.org/0000-0001-7740-1679</orcidid></search><sort><creationdate>20240701</creationdate><title>Site Characterization and Laboratory Testing of Unsaturated Quartz Sand Under Cyclic Loads</title><author>Baldovino, Jair de Jesús Arrieta ; 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Cyclic tests revealed heightened interface degradation with fewer cycles at increased load amplitudes. Fatigue results converged to a cumulative damage value, signifying material criticality limiting sand-sand interface resistance. Field exploration confirmed a heterogeneous sand deposit with geotechnical properties akin to laboratory findings. This study contributes nuanced insights into fine sand behavior under cyclic loading in unsaturated conditions, bridging gaps in existing knowledge.</abstract><cop>Cham</cop><pub>Springer International Publishing</pub><doi>10.1007/s10706-024-02769-6</doi><tpages>21</tpages><orcidid>https://orcid.org/0000-0002-0485-8456</orcidid><orcidid>https://orcid.org/0000-0002-4969-3085</orcidid><orcidid>https://orcid.org/0009-0006-7702-6964</orcidid><orcidid>https://orcid.org/0000-0001-7740-1679</orcidid></addata></record> |
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subjects | Bearing capacity Chemical tests Civil Engineering Cumulative damage Cyclic loading Cyclic loads Degradation Earth and Environmental Science Earth Sciences Earthquake damage Exploratory behavior Geotechnical Engineering & Applied Earth Sciences Hydrogeology Laboratory tests Loads (forces) Materials fatigue Matric suction Mechanical properties Original Paper Quartz Sand Shaft friction Shear Shear tests Soil properties Specific gravity Suction Terrestrial Pollution Waste Management/Waste Technology |
title | Site Characterization and Laboratory Testing of Unsaturated Quartz Sand Under Cyclic Loads |
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