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
Hauptverfasser: Baldovino, Jair de Jesús Arrieta, Filho, André Luiz Delmondes, Futai, Marcos Massao, Mera, Mateus
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container_issue 5
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container_title Geotechnical and geological engineering
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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.
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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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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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