Determination of the soil–water characteristic curve of unsaturated bentonite–sand mixtures

Fattah, Mohammed Y.; Salim, Nahla M.; Irshayyid, Entesar J.

doi:10.1007/s12665-017-6511-2

Cited by 33 publications

(12 citation statements)

References 13 publications

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“…During the operation of the repository, the PCM will be eroded by groundwater and radiant heat, and will remain unsaturated for a long time. Its water retention and permeability directly affect the swelling and deformation of the buffer barrier and joints, and then affect the sealing effect of the joints (Tripathy et al 2014;Fattah et al 2017;Liu et al 2020;Sun et al 2021). The soil-water retention curve (SWCC) re ects the water retention of the soil (Seiphoori, 2016).…”

Section: Introductionmentioning

confidence: 99%

Soil–water characteristic curves and hydraulic conductivity of Gaomiaozi bentonite pellet-contained materials

Zhu

2022

Environ Earth Sci

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The bentonite pellet-contained material (PCM) is a feasible material for the joint sealing of high-level radioactive waste repository. During the operation of the repository, the PCM will be unsaturated for a long time, and its water retention and permeability directly affect the buffer barrier seepage, nuclide migration, and joint healing. Moreover, the particle size of bentonite pellets and dry density are important factors affecting the performance of PCM. In this work, the pressure plate method and vapour equilibrium technique were utilized to test the soil-water characteristic curves (SWCCs) of the PCMs with different particle sizes and dry densities. The unsaturated hydraulic conductivity of the PCMs was predicted by combining the SWCC model and saturated hydraulic conductivity. The results showed that in the low suction range (20-1150 kPa), the dry density and particle size had a negative correlation with the water content at the same suction. In the high suction range (4200-309000 kPa), the dry density and particle size had little effect on the SWCC. The Gardner model was appropriate for describing the SWCC of PCM.In addition, the hydraulic conductivity of the PCM decreased with the increase in dry density, while increased with the increase in particle size. The in uence mechanism of the SWCC and hydraulic conductivity was further discussed based on the scanning electron microscopy images and pore size distribution curves.

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Section: Introductionmentioning

confidence: 99%

Soil–water characteristic curves and hydraulic conductivity of Gaomiaozi bentonite pellet-contained materials

Zhu

2022

Environ Earth Sci

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“…is tool is important and effective to correlate rigorous and time-consuming geotechnical soil parameters from simply tested index properties. Using such tools, predictive analyses are important for geotechnical engineering activities in order to easily determine soil properties [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Contemplated Investigation and Statistical Prediction of the Swelling Potential of Expansive Soils Using Index Properties of Holte Town, Southern Ethiopia

Entonyos

Dasho

Pampana

2022

Advances in Civil Engineering

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Expansive soils are problematic by exhibitingl shrink-swell behaviors and high plasticity under different moisture conditions, which is communal in salient areas of Ethiopia. This article aims to conduct a contemplated investigation and statistical analysis-based prediction for swelling potentials of soils using the index properties. This is used to define the properties of soils by investigation and to minimize the rigorous futuristic investigation by providing the prediction model of soils of the Holte town. Hence, thirty soil samples were collected from fifteen test pits with a depth of 1.5 m to 3.0 m from various locations. Investigations were conducted in the field and laboratory. Results revealed that the in situ moisture content, dry density, and bulk unit weight ranges were found, 31.21–40.93%, 1.20–1.30 g/cm3, and 1.60–1.73 g/cm3, respectively. The soil grain results presented that the study area is dominantly fine-grained soil properties (i.e., silt and clay). Liquid limit, plastic limit, plasticity index, and liquidity index ranged from 58 to 77%, 26–33%, 28–45%, and 0.00–0.35%, respectively, which assured that the soils in this town have 87% high plastic clay (CH). In addition, the swelling potential, swelling pressure, free swell, and activity investigations revealed that the soils in this town are highly plastic with a high degree of expansiveness. This was found that the swelling potential is the main measuring property of expansive soils, which was predicted by the statistical tool SPSS using numerous index properties. After conducting numerous statistical models, the best swelling potential was found Sp = 6.876γd + 0.178PI − 10.664, which is maintained by 90% of the points found within the regression line having a mean confidence level of 99.99%. In conclusion, the obtained model was validated and was found as an optimal measuring tool of expansiveness through the swelling potential of soils specifically in Holte town.

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“…SWCCs have been constructed for various soils. Fattah [14] found that SWCCs differed among bulk densities and that an increase in bentonite content had little effect on the SWCCs. Zhou [15] proposed that changes of soil physical composition, particle size and dry density would affect SWCCs, and Fattah [16] Compared the effects of soil saturation method and soil saturation method on SWCC and showed that the capillary rise saturation gives a higher value than the top surface water top and the variable water content method for both wetting and drying SWCC cases.…”

Section: Introductionmentioning

confidence: 99%

Soil-Water Characteristic Curves and Fitting Models of Collapsible Loess: A Case Study of Lanzhou, China

Zhao¹,

Zhang²,

Hu³

et al. 2022

Pol. J. Environ. Stud.

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The soil-water characteristic curve (SWCC) is an important hydrodynamic representation of soil and the basis for studying the water content of collapsible loess. The objectives of this study were to determine the water holding capacity of collapsible loess and the best fitting model of SWCC. We selected representative samples of collapsible loess in Lanzhou and measured the SWCCs. The SWCCs for soil samples varied with bulk density and particle size. The shapes were the same, but the volumetric water content (VWC) decreased as the suction increased. The suction of different soil layers tended to first decrease rapidly, then decrease more gradually and finally stabilize with VWC. The fitted VWC for the VG model was closer to the measured content, and the accuracy of the model was high. The VG-M (1-1/n, n) model was the best of the six models tested and was selected as the optimal model for fitting SWCCs, which will provide a theoretical basis for the accurate fitting of data of collapsible loess.

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Determination of the soil–water characteristic curve of unsaturated bentonite–sand mixtures

Cited by 33 publications

References 13 publications

Soil–water characteristic curves and hydraulic conductivity of Gaomiaozi bentonite pellet-contained materials

Soil–water characteristic curves and hydraulic conductivity of Gaomiaozi bentonite pellet-contained materials

Contemplated Investigation and Statistical Prediction of the Swelling Potential of Expansive Soils Using Index Properties of Holte Town, Southern Ethiopia

Soil-Water Characteristic Curves and Fitting Models of Collapsible Loess: A Case Study of Lanzhou, China

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