Stress and pore pressure in saturated clay subjected to heat from radioactive waste: a numerical simulation

Ma, Chenmin; Hueckel, Tomasz

doi:10.1139/t92-125

Cited by 39 publications

(12 citation statements)

References 16 publications

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“…Phenomena occurring at microstructural level have been proposed by various authors: expansion of the mineralogical components and the adsorbed water (Baldi et al, 1988), physico-chemical changes affecting diffusive double layers (Morin & Silva, 1984), thermally enhanced water adsorption (Sherif et al, 1982), and microstructural disturbances that enhance the transition from adsorbed water to free water (Ma & Hueckel, 1992Zhang et al, 1993). On the other hand, thermally induced irreversible effects are more likely to be associated with structural rearrangements at the macrostructural scale.…”

Section: Non-isothermal Tests On High-density Samplesmentioning

confidence: 99%

Suction effects on a compacted clay under non-isothermal conditions

2003

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The paper presents the results of an experimental study on the effects of suction and temperature on the volumetric behaviour of an unsaturated soil. Statically compacted Boom clay samples have been used in the testing programme, which has been performed using an oedometer apparatus with simultaneous control of suction and temperature. Suctions up to 0·45 MPa and temperatures up to 808C have been applied. Special measures have been taken to control and minimise the problems associated with phase changes and vapour migration at high temperatures. A comprehensive experimental programme has been carried out, including isothermal tests with control of vertical stress, suction and temperature, non-isothermal tests under constant suction, and isothermal swelling pressure tests. Testing samples at two compacted soil densities provides observations concerning a wide scope of behaviour ranging from collapse to swelling behaviour on wetting. Test results obtained at 808C have been compared with those of tests performed at room temperature (228C). Based on these comparisons, thermal effects on a variety of features of behaviour such as swelling potential, swelling pressure, collapsibility, shrinkage strains, compressibility, stress path dependence and degree of strain reversibility are presented and discussed. Although the basic behaviour is similar at high and low temperatures, various significant differences are identified concerning mainly swelling strains developed during wetting and compressibility with respect to loading. Swelling pressure test results indicate that the high-temperature samples yield at a lower stress than that observed in room-temperature samples, suggesting that the stress domain bounded by the main yield surface reduces as temperature increases-a behaviour feature shared with saturated soils.

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Section: Non-isothermal Tests On High-density Samplesmentioning

confidence: 99%

Suction effects on a compacted clay under non-isothermal conditions

2003

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“…The first term on the right-hand side of Equation (2) represents the equation deduced by Philip and de Vries [13], which refers to the influence of temperature on soil water potential through its influence on surface tension [34], whereas the second term stands for the effect of temperature on contact angle [23].…”

Section: Soil-water Characteristic Curve Model At Different Temperaturesmentioning

confidence: 99%

Effects of Temperature Change on the Soil Water Characteristic Curve and a Prediction Model for the Mu Us Bottomland, Northern China

Xiao-ying

Pan

et al. 2019

Water

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The soil-water characteristic curve (SWCC) is the basis for obtaining the hydraulic conductivity parameters of a soil as well as for using soil water and heat transport models. At present, the curve can be obtained by two methods: by direct measurement and by empirical formula. Direct measurement is both difficult and time-consuming. By contrast, fitting the SWCC with a suitable empirical formula is stable and convenient. The van Genuchten (VG) model has the advantage of universal applicability due to its use of a statistical aperture distribution model for estimating hydraulic conductivity. This study selected the Mu Us Bottomland as a study area. Data on the water content and water potential of undisturbed soil from this site were obtained with a Ku-pF instrument and a self-designed soil column experiment with temperature settings of 13 °C, 18 °C, 23 °C, 27 °C, and 30 °C. The variation of four main parameters in the VG model with temperature was analyzed based on thermodynamic theory and considering the effect of temperature on soil capillary pressure via its effects on surface tension and contact angle. A prediction model for the soil-water characteristic curve of the Mu Us Bottomland was then constructed, and its applicability was further analyzed. The temperature dependence of the SWCC demonstrated here provides an important scientific basis for agricultural production, farmland water conservancy, and the design of soil and water conservation engineering projects.

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“…The hydration pressure decreases rapidly with an increasing temperature because of the reduction of the water molecular layer on the surface of the bentonite [42]. The osmotic pressure increases because of the reduction of the thickness of the electric double layer [42,43], and the pore water pressure also increases because of the differential expansion of the pore water and the skeleton [44,45]. The latter two effects almost exactly counterbalance the former effects.…”

Section: Temperaturementioning

confidence: 99%