Unsaturated Hydraulic Conductivity of Compacted Sand-Kaolin Mixtures

Chiu, Te-Fu; Shackelford, Charles D.

doi:10.1061/(asce)1090-0241(1998)124:2(160)

Cited by 66 publications

(30 citation statements)

References 13 publications

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“…The results of unsaturated hydraulic conductivity are in agreement with that obtained in previous works (Daniel, 1982;Chiu and Shackelford, 1998;Bruckler et al, 2002;Cui et al 2008b): the unsaturated hydraulic conductivity increased with infiltration. After Cui et al (2008b), similar trend is usually observed on low-plasticity soils.…”

Section: Discussionsupporting

confidence: 92%

“…Finally, the unsaturated hydraulic conductivity (k) at the location z and at the moment t was calculated from the corresponding water fluxes and hydraulic gradient. The calculated unsaturated hydraulic conductivity is usually plotted versus the suction s at the corresponding location z and moment t. More details about the instantaneous profile method can be found in Daniel (1982), Chiu and Shackelford (1998), Bruckler et al (2002), Cui et al (2008b).…”

Section: Resultsmentioning

confidence: 99%

“…Further examination of laboratory infiltration studies reveals that, in the determination of unsaturated hydraulic conductivity by the instantaneous profile method, only the soil suction was continuously monitored (Daniel, 1982;Chiu and Shackelford, 1998;Bruckler et al, 2002;Loiseau et al, 2002), the water content evolution being deduced from the water retention curve determined separately. In the works of Robinet and Rhattas (1995) and Kröhn (2003), the infiltration test was stopped after a predefined period and the soil sample was dismantled for the direct determination of water content by oven-drying.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development of a Large-Scale Infiltration Tank for Determination of the Hydraulic Properties of Expansive Clays

Tang

Cui

et al. 2009

Geotechnical Testing Journal

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A large-scale infiltration tank was developed to study the water transfer in compacted expansive clay. Volumetric water content sensors were buried in a soil column for water content monitoring during infiltration. In addition to water content, soil suction and temperature at various locations and the heave at the soil surface were also monitored. Emphasis was put in minimizing the effect of sensors installation on water transfer and soil deformation. The results obtained for 338 days of infiltration were presented in terms of changes in suction, volumetric water content, temperature, and the soil heave. Based on the recorded data, the performance and limitation of different suction and volumetric water content sensors and the adopted test procedure were analyzed. The recorded data on soil suction and volumetric water content were finally analyzed for determining the unsaturated hydraulic properties of soil, such as the water retention curve and the unsaturated hydraulic conductivity. Note also that the results constitute useful data for further physical analysis or numerical models’ calibration.

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Section: Discussionsupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of a Large-Scale Infiltration Tank for Determination of the Hydraulic Properties of Expansive Clays

Tang

Cui

et al. 2009

Geotechnical Testing Journal

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“…Similar observations were noted by other researchers. Chiu and Shackelford [45] obtained maximum volumetric water contents θ m from 0.84 to 0.90 of the saturated value θ s during the wetting process of compacted sand-kaolin mixtures. After several days of soaking, Perera et al [46] determined that the degree of saturation was 87%-100% for the clayey samples.…”

Section: Test Resultsmentioning

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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“…The IPM applied to diŠerent surface water ‰ow conditions (evaporation and inˆltration) has been used by many researchers (Wind, 1968;Vachaud et al, 1974;Hamilton et al, 1981;Daniel, 1983;Ed Diny, 1993;Tamari et al, 1993;Chiu and Shackelford, 1998;Gaidi, 2002;Arya 2002) to estimate the retention and conductivity curves for diŠerent soils in a large water content range. The IPM is an unsteady-state method.…”

Section: Ipm (Inˆltration In a Vertical Column Of Soil)mentioning

confidence: 99%

Measurements of Unsaturated Hydraulic Conductivity Functions of Two Fine-Grained Materials

Taïbi

Bicalho

Sayad-Gaidi

et al. 2009

Soils and Foundations

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Water unsaturated hydraulic conductivity (kw) functions of two remoldedˆne-grained materials were measured over a wide range of degrees of saturation (Sr) with two methods. The instantaneous proˆle method (IPM) was used for Sr À50z. An original vapor equilibration method (also known as the vapor equilibrium technique, VET) was used for Sr º50z. Both materials compacted at the standard Proctor optimum water content and maximum density, have saturated hydraulic conductivities (ksat)º10-7 m/s. The VET couples the total soil suction (s) control from desiccators with saturated salt solutions with water mass measurements from a digital laboratory balance. The kw measurements of the two techniques are consistent and complementary. The eŠect of hysteresis on the kw functions at higher s values was also investigated. The experimental results suggest that the hysteretic eŠect on the kw-Sr and kw-s relationships cannot be neglected, and that the measured kw are signiˆcantly dependent on the initial Sr. The VET tests on the specimens that were initially dried give the lowest values of kw and the tests on the specimens that were initially saturated give the highest values of kw. The relative hydraulic conductivity values are very small (krwº2×10 -5 ) in this saturation range (Srº50z) for the tested materials.

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Unsaturated Hydraulic Conductivity of Compacted Sand-Kaolin Mixtures

Cited by 66 publications

References 13 publications

Development of a Large-Scale Infiltration Tank for Determination of the Hydraulic Properties of Expansive Clays

Development of a Large-Scale Infiltration Tank for Determination of the Hydraulic Properties of Expansive Clays

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

Measurements of Unsaturated Hydraulic Conductivity Functions of Two Fine-Grained Materials

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