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Interpretation of Pressuremeter Tests in Unsaturated Soil
This paper examines cylindrical cavity expansion in unsaturated soil and its application to the interpretation of pressuremeter test results. An analytical solution for cylindrical cavity expansion in unsaturated soil is presented and used to examine the influence of unsaturated soil characteristics on the pressuremeter response. The pressuremeter response is characterized by the limit pressure…
Some Physical Properties of Unsaturated Oil-Contaminated Sand
Environmental hazards are created by both on and offshore oil spills which contaminate soil. Oil contamination may also change the physical properties of soil. This paper summarizes the results relating to compaction, hydraulic conductivity, and shear strength of laboratory tests conducted with oil-contaminated sand. Only one type of sand was used for the tests primarily at two relative densiti…
A Fully Coupled Analysis Procedure for Dynamic Behavior of Unsaturated Soils …
A fully coupled analysis procedure for dynamic analyses of unsaturated porous media is presented. The analysis procedure is based on the finite element implementation of the governing equations derived utilizing the Theory of Mixtures with Interfaces (TMI). TMI explicitly considers the interfaces existing between various bulk phases in a multiphase porous media such as the contractile skin betw…
Effect of Suction on the Strength of Unsaturated Soil
Unsaturated soil condition which give rise to negative pore pressure is important in evaluating the stability of geotechnical structures such as slopes, retaining walls, excavations and footings. Its importance is more so in tropical countries, where rainfall and intense chemical weathering have resulted in the formation of such soils. In this study, the shear strength characteristics of granit…
The Influence of Fabric on the Shear Behaviour of Unsaturated Compacted Soils…
Fabric plays a vital role in determining the engineering behaviour of compacted soils, particularly under unsaturated conditions. Clayey materials compacted dry of optimum moisture content develop an aggregated or "packet" fabric. The presence of aggregations causes the soil to behave in a coarser fashion than would be justified by the grading. This means that the friction angle a (repres…
Shear Behavior of Compacted Silty Loess
Loess, a uniform-sized, wind-blown, cohesive soil can be problematic in geotechnical engineering applications. Natural deposits have high strength and exhibit stable vertical slopes; however, dramatic collapse can occur when loess becomes saturated. In remolded, compacted applications, the behavior of loess is less well known. Regionally (central USA), embankments of compacted loess can exhibit…
