Journal
CANADIAN GEOTECHNICAL JOURNAL
Volume 46, Issue 9, Pages 1084-1092Publisher
NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS
DOI: 10.1139/T09-039
Keywords
soil-water retention curve (SWRC); tropical soil; microstructure
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
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Some peculiarities of water retention in a tropical lateritic soil of clayey nature are presented and discussed. The typical soil microstructure is shown through thin-layer plates emphasizing soil microaggregation and pore distribution and their repercussion on the soil-water retention curve and on hysteresis. It is shown that the clayey soil has a behavior that to a large extent resembles sandy soil, which is characterized by the relatively high saturated hydraulic conductivity, low air-entry value, and small suction range at which water drainage takes place. The severe weathering processes that originated this soil have produced an altered soil that seems to be homogeneous in terms of physical indices, hydraulic conductivity, and soil-water retention characteristics, up to 4.5 m in depth.
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