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Browsing by Subject Vadose Zone

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  • Undrained Shear Strength of Unsaturated Soils under Zero or Low Confining Pressures in the Vadose Zone

    • Authors: Oh, T.W.;  Advisor: -;  Participants: Vanapalli, S. (2018)

  • In geotechnical engineering practice, many projects such as stability analysis of slopes or trenches and pavement design involve soils in vadose zones at shallow depths, where soils are under unsaturated conditions. For these types of projects, undrained shear strength test results obtained under zero or low confining pressure can be effectively used to analyze the behaviors of unsaturated soils. Experimental procedures to determine the undrained shear strength for different soil suction values, however, is time consuming even under low confining pressure. For this reason, we attempted to develop a semi‐empirical model to predict the undrained shear strength of unsaturated soils at a ...
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  • UZIG Research: Measurement and Characterization of Unsaturated Zone Processes under Wide‐Ranging Climates and Changing Conditions

    • Authors: Trost, J.J.;  Advisor: -;  Participants: Perkins, K.S.; Henson, W.; Mirus, B.B.; Nimmo, J.R.; Muñoz-Carpena, R. (2018)

  • We summarize key findings from 14 papers, several of which originated from a meeting convened by UZIG in 2017 at the University of Florida in Gainesville titled “Land‐Use Change, Climate Change, and Hydrologic Extremes: Unsaturated Zone Responses and Feedbacks.” This special section of Vadose Zone Journal contains multidisciplinary research in three general categories relevant to measuring and understanding unsaturated zone responses to changing land uses and climate: (i) unsaturated zone properties and processes; (ii) soil–plant–atmosphere interactions; and (iii) novel field sampling devices. A strong cross‐cutting theme in these papers is the value of continuous monitoring data and ...