... that are ambiguous with the DC electrical resistivity method. The additional data have the potential to more fully characterize the electrical properties of saturated and unsaturated soils, as well as to help distinguish unique geophysical signatures of various geomaterials to enhance a geophysical site...

...Lucas A. Walshire; Thomas L. Brandon An embankment was instrumented and monitored as part of a multiyear project to assess appropriate pore-water pressure distributions and soil water retention curves for use as initial conditions in transient seepage analyses. The increased use of unsaturated soil...

... combines with molecular diffusion to produce a relaxation rate that is inversely proportional to the pore size in saturated specimens or the mean distance to a pore wall in unsaturated soils. We used NMR to nondestructively characterize pore size distribution, monitor changes in pore space during...

... of saturation with volumetric contraction. 18 09 2019 03 09 2020 23 12 2020 cyclic simple shear unsaturated soils seismic compression References ASTM International. 2017 . Standard Test Method for Consolidated Undrained Direct Simple Shear Testing of Fine Grain Soils . ASTM...

...Bo Chen; You Gao; De’an Sun; Jie Li Unsaturated soils at high suctions are widespread in arid and semiarid areas. Test data on the mechanical behavior of unsaturated soils are scarce at high suctions. In this article, the effect of void ratio or density on the soil-water retention behavior...

... of unsaturated soil mechanics experimentally testing highly compacted soils, which often possess complex shear strength and dilatancy characteristics. The main objective of this study is to investigate the effect of suction and confining pressure on shear strength and dilatancy of a highly compacted silty sand...

... 11 2019 03 06 2020 17 08 2020 unsaturated soils residual soils at-rest coefficient of earth pressure suction-controlled at-rest coefficient of earth pressure device References Abdelhamid , M. S. and Krizek   R. J. . 1976 . “ At-Rest Lateral Earth Pressure...

...Hailong Wang; Jaylord U. Tan Tian; Junichi Koseki; Takeshi Sato The details of a multifunctional triaxial system developed for unsaturated soils over the past ten years at The University of Tokyo are described. This study first briefly reviewed three functions of the triaxial system developed...

...Oliver-Denzil S. Taylor; Amy L. Cunningham; Lucas A. Walshire The soil-water retention curve (SWRC) is fundamental in understanding unsaturated soil behavior and is related to both the unsaturated shear strength and hydraulic conductivity. The SWRC shows that a saturated soil undergoing a drying...

...Tácio M. P. de Campos; Taíse M. de O. Carvalho; Ana Carolina de C. Viana In the evaluation of unsaturated soil behavior in the laboratory, it is required to measure the total volume change of triaxial soil specimens. This, however, is not an easy task, with setups proposed in the literature being...

... water content that can be used in centrifuge modeling as well as other laboratory testing applications. Keywords unsaturated soils, heat dissipation sensor, water content, matric suction, geotechnical centrifuge Introduction Recent advances in sensing technology have progressively advanced techniques...

... as 0.02 %) is required. Details of the calibration and test procedures are described and discussed. The test results of reconstituted specimens of a fine sand mixture and Ascot Corner silt are also presented to demonstrate the key features of the modified apparatus. Keywords unsaturated soils, oedometer...

...), respectively. In addition, finite element analyses were also carried out to simulate vertical load versus settlement behaviors of model pile tests using a commercial finite element software, SIGMA/W (GeoStudio 2007). Keywords end-bearing capacity, shaft-bearing capacity, unsaturated soils, matric suction...

... conditions, sequential cracking, environmental chamber, unsaturated soils Introduction Cracks develop in soils as a result of environmental oscillations, changes in temperature, air relative humidity, solar radiation, wind, etc., that alter the water content and form complex random patterns that are further...

...Jun Yao; William J. Likos Experiments were conducted to compare two sensing techniques for measuring thermal conductivity of unsaturated soils: ( i ) a modified transient plane source (MTPS) method for non-destructive measurements using a planar, interfacial heat reflectance sensor, and ( ii...

... for field measurements of soil moisture content and suction. 19 06 2016 24 02 2017 01 09 2017 moisture/suction time domain reflectometry probe dielectric constant unsaturated soils References ASTM D5298-03 2003 , Standard Test Method for Measurement of Soil Potential...

... provides a simple, fast, and non-destructive way to measure SSCC under varying drying and wetting conditions. 18 03 2016 16 08 2016 09 12 2016 Young's modulus unsaturated soils hysteresis soil–water retention suction stress particle image velocimetry soil drying and wetting...

...U. D. Patil; L. R. Hoyos; A. J. Puppala A fully automated relative-humidity (auto-RH) control unit has been adapted to a newly implemented double-walled triaxial cell to test unsaturated soils under higher total suction states via the vapor-pressure technique, allowing for direct measurement...

.... It is shown that, for the sandy soil, a few kPa of negative matric suction are needed to fully saturate the specimen, whereas for the clayey soil, over 10 kPa of negative matric suction are needed to fully saturate the specimen. Keywords soil water retention curve, matric suction, unsaturated soils, constant...

... that the larger double layer promoted by the increased exchangeable sodium ion concentration is responsible for the slightly higher swell potentials and lower compressions of the unsaturated contaminated kaolinite specimens. unsaturated soils swell compression inorganic contaminants References...