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Effect of soil moisture content on the bearing capacity of small bored piles in the unsaturated soil of Maringá, Paraná, Brazil

Ricken Marques, Verônica ; Belincanta, Antonio ; Beroya-Eitner, Mary Antonette ; Almada Augusto, Jorge Luis ; Guelssi, Ewerton ; Zachert, Hauke (2021):
Effect of soil moisture content on the bearing capacity of small bored piles in the unsaturated soil of Maringá, Paraná, Brazil. (Publisher's Version)
337, In: MATEC Web of Conferences, pp. 1-8,
Darmstadt, EDP Sciences, PanAm-Unsat 2021: 3rd Pan-American Conference on Unsaturated Soils, Rio de Janeiro, Brazil (Online), 25.-28.07.2021, ISSN 2261-236X,
DOI: 10.26083/tuprints-00018612,
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Item Type: Conference or Workshop Item
Origin: Secondary publication service
Status: Publisher's Version
Title: Effect of soil moisture content on the bearing capacity of small bored piles in the unsaturated soil of Maringá, Paraná, Brazil
Language: English
Abstract:

In this study, the influence of soil moisture on the bearing capacity of piles founded in an unsaturated clay soil was investigated. The soil studied, composing the upper soil layer in Maringá, Brazil, is lateritic, has degree of saturation between 37% and 70% and has collapsible behaviour when wet. The bearing capacity was determined by full-scale load tests following the Brazilian Standard for Static Load Test. Two pile lengths, 4 m and 8 m, were considered. To analyse the influence of soil moisture, two tests were performed for each pile length: one in soil in its natural moisture content and another in pre-moistened soil. Results show that for both pile lengths, an increase in water content caused a significant reduction in bearing capacity, which is attributed to the decrease in the matric suction of the soil. This is confirmed by the results of the initial evaluation made on the variation of matric suction and its contribution to the bearing capacity with changes in water content. In summary, this study confirms that the pile bearing capacity in unsaturated soil is dependent on soil water content, highlighting the fact that the approach of assuming full saturation condition in the evaluation of the pile bearing capacity in such soil may give erroneous results. Moreover, this study demonstrate that the empirical methods most commonly used in Brazil for pile bearing capacity determination, the Décourt & Quaresma and Aoki & Velloso methods, are overly conservative when applied to the Maringá soil.

Journal or Publication Title: MATEC Web of Conferences
Title of Book: MATEC Web of Conferences
Volume: 337
Place of Publication: Darmstadt
Publisher: EDP Sciences
Collation: 8 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute and Laboratory of Geotechnics
Event Title: PanAm-Unsat 2021: 3rd Pan-American Conference on Unsaturated Soils
Event Location: Rio de Janeiro, Brazil (Online)
Event Dates: 25.-28.07.2021
Date Deposited: 18 Jun 2021 07:37
Last Modified: 25 Jun 2021 09:07
DOI: 10.26083/tuprints-00018612
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-186127
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/18612
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