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Moisture Influence on the Shakedown Limit of a Tropical Soil

2021; Springer Nature; Linguagem: Inglês

10.1007/978-3-030-77238-3_25

2366-2557

Gleyciane Almeida Serra, Antônio Carlos Rodrigues Guimarães, Maria Esther Soares Marques, Carmen Dias Castro, Artur Cortês da Rosa,

Landslides and related hazards

This paper presents results from permanent deformation tests carried out on fine tropical soils in order to study the effect of moisture variation. Shakedown limit was defined through repeated load triaxial tests under different stress states for 5000 load cycles. A mathematical model to classify permanent deformation behavior proposed by Werkmeister (Doctoral thesis, Technical University of Dresden [Werkmeister S (2003) Permanent deformation behavior of unbound granular materials in pavement constructions. Doctoral thesis. Technical University of Dresden, 189 pp]) was used to rank the shakedown limit of the materials. In this research, a lateritic clayey soil, according to the classification MCT (Miniature, Compaction, Tropical) from Nogami and Villibor (Brazilian Simposium of Tropical Soils in Engineering. Rio de Janeiro, RJ, pp 30–41, [Nogami JS, Villibor DF (1981) Uma nova classificação de solos para finalidades rodoviá-rias. In: Brazilian simposium of tropical soils in engineering, Rio de Janeiro, RJ, pp 30–41]), was tested in the optimum content and at the high moisture induced by capillary post-compaction. The resilient behavior was studied to characterize the mechanical behavior of the material. The results of permanent deformation tests showed that fine tropical soils may have a nonsignificant reduction of their shakedown limit, with the increase moisture of 1%. The proposed model showed a good agreement for this tropical soil at an optimum moisture. The understanding of the shakedown phenomenon from tropical soils may help to bridge the gap between the materials accepted by traditional classification and those not accepted, although they present good mechanical resistance.