Influence of soil structure and stress history on the soil–water characteristics of a compacted till

Vanapalli, Sai K.; Fredlund, D. G.; Pufahl, D E

doi:10.1680/geot.51.6.573.40456

Cited by 112 publications

(167 citation statements)

References 14 publications

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“…The estimated air entry point fairly evolves with the compaction energy, giving a value of 1.1MPa for the modified proctor, and a relatively lower value under 1MPa for the normal proctor. This type of result is corroborated by other studies [9,10] find in the literature. The main difference between the two curves comes from their respective densities.…”

Section: Retention Curvessupporting

confidence: 91%

Hydro-mechanical paths within unsaturated compacted soil framed through water retention surfaces

et al. 2016

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Abstract.Compaction is a key issue of modern earthworks... From sustainable development, a need arise of using materials for compaction under given conditions that would normally be avoid due to unpredictable pathologies. The application of compaction on fine grained soils, without a change of gravimetric water content, lead to very important modifications of the void ratio and hence suction. Therefore the hydro-mechanical behaviour of fine grained soil need to be rendered around three variables: suction, void ratio, saturation degree or water content. The barring capacity of the soil is assessed through Penetrometers (In-situ manual penetrometer, CBR) in order to assess gains through compaction. The three states variables are then assessed for in situ and frame through water retention surfaces, realized from Proctor tests, in which compaction effect and path could be described.

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Section: Retention Curvessupporting

confidence: 91%

Hydro-mechanical paths within unsaturated compacted soil framed through water retention surfaces

et al. 2016

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“…Many studies were conducted to assess the influence of different factors on the water retention properties of the soil in geotechnical engineering applications. Numerous investigations (e.g., [23][24][25][26]) noted that the void ratio, water content, and stress state of a soil have a strong influence on the SWCC. Standard laboratory equipment based on the axis translation technique, such as the pressure plate, volume extractor, suction-controlled oedometer, modified triaxial apparatuses, and standard tensiometers, are the most common devices used to control or measure matric suction.…”

Section: Methods Used For Determination Of Soil-water Characteristicmentioning

confidence: 99%

Soil-Water Characteristic Curve of Residual Soil from a Flysch Rock Mass

et al. 2018

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Depending on the nature of the material and suction range, laboratory measurements of the soil-water characteristic curve (SWCC) can be time-consuming and expensive, especially for residual soils, in which a wide range of particle sizes and soil structures typically results in SWCCs that cover a wide range of suction. Investigations of the SWCCs of residual soil from flysch rock masses are rare, and so far, no results were presented in the literature which were obtained by performing measurements on undisturbed specimens. In this paper, a detailed examination of water retention characteristics is performed for a specific type of residual soil (CL) formed by the weathering of a flysch rock mass. Measurements performed by using different techniques and devices on intact specimens were successfully combined to obtain the SWCC during both drying and wetting processes, under different stress conditions, and from saturated to air-dried conditions. Used procedures are suitable for the determination of SWCCs of soils that undergo volume changes during the drying or the wetting process, since instantaneous volumetric water content can be determined. Results presented in this paper can be used to assess the influence of desaturation of the residual soil covering flysch slopes during dry summer periods by providing key-in material properties required to analyze the transient rainfall infiltration process.

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“…It is also understandable that stress effects have not been taken into account and have rarely been studied. Recent work by Vanapalli et al [7] has found that the stress history and soil fabric have significant influence on the measured SWCCs of a compacted till. The SWCCs were determined on over-consolidated soil specimens under zero net normal stress, simulating the effects of over-consolidation.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Soil–Water Characteristic Curves in One-Dimensional and Isotropic Stress Conditions

Habasimbi

Nishimura

2018

Soil Systems

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Understanding unsaturated soil behavior is key to the design of foundations and embankment structures. Geotechnical engineers have applied net normal stress and matric suction to these engineering problems. Water retention activity in soils is used to predict seepage problems and stability of slope failures. Soil-Water Characteristic Curve (SWCC) tests contribute largely to matric suction interpretation. Determination of SWCCs in the laboratory is usually done using a pressure plate apparatus where vertical or confining stress cannot be applied. Mathematical models of SWCC though commonly accepted in geotechnical engineering practices, do not take into consideration stress conditions such as the difference between a one-dimensional condition and isotropic confining conditions. This study conducted SWCC tests of a silt soil under one-dimensional and isotropic confining stress conditions and focused on the differences between these types of SWCC data sets. Vertical and isotropic confining stresses ranging from 100 to 600 kPa were applied under both stress conditions. SWCCs appears to be affected by the influence of different stress conditions. Lateral pressure and confinement on an isotropic compression condition caused the soil specimen to become dense in void structure and consequently, soil moisture flow movement decreased. This probably induced high retention activities in the silt soil specimen. The study further suggests that the current SWCC models require further development to take into consideration the effect of different stress conditions.

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Influence of soil structure and stress history on the soil–water characteristics of a compacted till

Cited by 112 publications

References 14 publications

Hydro-mechanical paths within unsaturated compacted soil framed through water retention surfaces

Hydro-mechanical paths within unsaturated compacted soil framed through water retention surfaces

Soil-Water Characteristic Curve of Residual Soil from a Flysch Rock Mass

Comparison of Soil–Water Characteristic Curves in One-Dimensional and Isotropic Stress Conditions

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