Osmotic Control of the Matric Soil-Water Potential

Zur, B.

doi:10.1097/00010694-196612000-00007

Cited by 81 publications

(41 citation statements)

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“…Therefore, hereafter, the term``suction'' is simply taken to mean matric suction. The axistranslation technique (Hilf, 1956) and the osmotic technique (Zur, 1966) are generally used to control suction in laboratory testing of unsaturated soils. Hilf (1956) introduced the axis-translation technique of elevating the pore air pressure, ua, to increase the pore water pressure, uw, to be positive, preventing cavitations in water drainage systems.…”

Section: Introductionmentioning

confidence: 99%

“…An alternative suction control method is the osmotic technique. Delage et al (1998) reported that this technique was initially developed by biologists (LagerwerŠ et al, 1961) and then adopted by soil scientists (Zur, 1966 (Komornik et al, 1980) and a standard triaxial apparatus (Delage et al, 1987;Cui and Delage, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…Beneath the membrane, a solution is circulated. The membrane is permeable to water and ions in the soil but impermeable to large solute molecules and soil particles (Zur, 1966). This results in a diŠerence in solute concentration between the specimen and the solution, leading to a diŠerence in osmotic potential across the membrane.…”

Section: Introductionmentioning

confidence: 99%

“…Osmotic potential of the solution causes drainage of the soil specimen and the potential isˆnally balanced by the negative pore water pressure in the specimen. According to Zur (1966), an analysis of water energy on both sides of a membrane can prove that matric suction in a soil specimen is equal to osmotic pressure (osmotic potential) of the solution in equilibrium. When the osmotic pressure of the solution is greater than the suction in the specimen, water is drawn from the soil into the solution, increasing the suction in the specimen to achieve equilibrium.…”

Section: Introductionmentioning

confidence: 99%

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The Axis-Translation and Osmotic Techniques in Shear Testing of Unsaturated Soils: A Comparison

Cui

Chen

et al. 2007

Soils and Foundations

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Matric suction in the laboratory testing of an unsaturated specimen is usually controlled by the axis-translation technique or the osmotic technique. To investigate possible diŠerences in the axis-translation and osmotic techniques in shear testing of unsaturated soils, three series of unsaturated triaxial shear tests were conducted on a compacted expansive clay with an initial degree of saturation of 82z. Two of these series were performed using the axis-translation and osmotic techniques at HKUST. Another series was performed using the osmotic technique at ENPC. In the series using the axis-translation technique, the single-stage testing procedure was compared with the multi-stage testing procedure and these two testing methods were found to provide consistent shear strength information. The consistency of the results from the osmotic technique at HKUST and ENPC demonstrated the reliability of the osmotic technique. Based on the extended Mohr-Coulomb shear strength formulation, comparison of the results using the axis-translation technique and the osmotic technique showed that there was no diŠerence in determining the internal friction angle, q?. However, the values of q b in the test series using the axis-translation technique were slightly larger than those in the test series using the osmotic technique by 39 -49 .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Axis-Translation and Osmotic Techniques in Shear Testing of Unsaturated Soils: A Comparison

Cui

Chen

et al. 2007

Soils and Foundations

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“…However, a measurable amount of PEG may be absorbed by the plant (1 1,14), and PEG has been reported to reduce phosphorous uptake (7,21,22), translocation (22), and the oxygen content of nutrient solutions (16). These difficulties have been partially overcome by separating the roots from the osmoticum with a semipermeable membrane enclosing a combination of roots and soil (5,8,28,29), or other rooting medium (26). The latter techniques reliably control water stress levels, but significantly restrict the available root volume, thus limiting the size of experimental plant material and the duration ofthe water stress treatment due to microbial degradation of the membranes (26).…”

mentioning

confidence: 99%