Anisotropy in volume change behaviour of soils during shrinkage

Mishra, Partha Narayan; Zhang, Yuan; Bhuyan, Habibullah; Scheuermann, Alexander

doi:10.1007/s11440-020-01015-6

Cited by 30 publications

(6 citation statements)

References 48 publications

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“…A different behavior was observed for the soils with the highest clay content (SAL and MAZ) for which the variations of ρ b resulted quite high (up to about 25%) for the samples repacked at both minimum and maximum bulk densities (Figure 2e-f). For these samples the soil shrinkage curves followed a similar tendency from saturation to oven-dried; the presence of the residual and basic phases of the shrinkage process [44][45][46][47] was identified in all the samples, whereas the structural phase manifested only in the samples prepared at the minimum bulk density.…”

Section: Discussionmentioning

confidence: 81%

Development and Validation of a New Calibration Model for Diviner 2000® Probe Based on Soil Physical Attributes

Provenzano

Rallo

Almeida

et al. 2020

Water

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This study aimed to develop a new model, valid for soil with and without expandable characters, to estimate volumetric soil water content (θ) from readings of scaled frequency (SF) acquired with the Diviner 2000® sensor. The analysis was carried out on six soils collected in western Sicily, sieved at 5 mm, and repacked to obtain the maximum and minimum bulk density (ρb). During an air-drying process SF values, the corresponding gravimetric soil water content (U) and ρb were monitored. In shrinking/swelling clay soils, due to the contraction process, the variation of dielectric permittivity was affected by the combination of the mutual proportions between the water volumes and the air present in the soil. Thus, to account for the changes of ρb with U, the proposed model assumed θ as the dependent variable being SF and ρb the independent variables; then the model’s parameters were estimated based on the sand and clay fractions. The model validation was finally carried out based on data acquired in undisturbed monoliths sampled in the same areas. The estimated θ, θestim, was generally close to the corresponding measured, θmeas, with Root Mean Square Errors (RMSE) generally lower than 0.049 cm3 cm−3, quite low Mean Bias Errors (MBE), ranging between −0.028 and 0.045 cm3 cm−3, and always positive Nash-Sutcliffe Efficiency index (NSE), confirming the good performance of the model.

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Section: Discussionmentioning

confidence: 81%

Development and Validation of a New Calibration Model for Diviner 2000® Probe Based on Soil Physical Attributes

Provenzano

Rallo

Almeida

et al. 2020

Water

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“…Firstly, kaolin has relatively low shear strength and often requires some form of treatment or reinforcement to support applied loads. Also, kaolin is readily available commercially, and its information database is extensive due to the large number of studies involving its use (Mishra et al, 2018a;Mishra et al, 2018b;Mishra et al, 2020;Rossato et al, 1992). The novelty of this paper is that it compares the shear strength behaviour of geocomposites containing a CWG column with those containing a column made up of NS or MS, which are traditionally used in sand column construction (Zukri and Nazir, 2018).…”

Section: Use Of Alternative Geomaterials In Granular Columnsmentioning

confidence: 99%

Kaolin Clay Reinforced with a Granular Column Containing Crushed Waste Glass or Traditional Construction Sands

et al. 2022

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Installation of granular columns is a cost-effective and versatile in situ technique to improve the shear strength, settlement, and drainage behaviour of weak soils. It involves backfilling vertical boreholes in the ground with granular materials stiffer than the native soil, such as stone or compacted sand.However, the massive use and overexploitation of sand and natural aggregates have depleted their reserves in recent decades, causing damage to the environment, creating sand shortages and skyrocketing their price. Hence, it is essential to develop a sustainable alternative to natural aggregates to construct granular columns. The ever-increasing stockpiles of waste glass could be a potential replacement for natural sand in several geotechnical construction applications, noting that both materials have a similar chemical composition. Using crushed waste glass (CWG) as an alternative to traditional natural and manufactured (quarried) sands in granular columns could offer a multipronged benefit by recycling non-biodegradable waste (glass) and by conserving a depleting natural resource (sand). Using a large direct shear (LDS) machine, this study investigated the shear strength behaviour of kaolin (to represent a typical weak soil) reinforced with a central granular column. Three different materials were separately used to backfill the column, including natural sand (NS), manufactured sand (MS) and CWG. The results revealed that the geocomposites containing the CWG column have the highest peak friction angle and relatively greater shear strength under high normal stresses, favouring the potential use of CWG as a green alternative to traditional sands in backfilling granular columns, ultimately supporting resource conservation, waste recycling and the paradigm shift towards a circular economy.

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“…This phenomenon is understandable, given the high moisture content the specimens possessed immediately after compaction. Loss of a high volume of water from voids during the first drying phase would have definitely resulted in a significant decrease in voids content, irreversible particle rearrangements/fabric changes and breakage of particle bonds [36]. Upon rewetting, the rearranged soil/BAS matrix would have been further weakened by the addition of water due to the softening of particle rigidity [62].…”

Section: Absolute Volumetric Shrinkagementioning

confidence: 99%

Effect of biochar on desiccation of marine soils under constant and cyclic temperatures

et al. 2022

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Biochar has recently been gaining increasing attention as a stable and sustainable soil amendment material. However, the effect of biochar amendment on the desiccation behaviour of coastal soils has not yet been examined. Consequently, the present study primarily investigated the effect of exposing biochar-amended marine soil (BAS) to constant and cyclic temperatures on its swell–shrink, evaporation and desiccation cracking characteristics. Biochar contents of 1%, 2%, 4% and particle size ranges of PS-1 (600 μm < D ≤ 2000 μm), PS-2 (300 μm < D ≤ 600 μm), PS-3 (D ≤ 75 μm) (D: biochar particle diameter) were employed. It was revealed that the absolute volumetric shrinkage of both unamended and biochar-amended specimens increased as the number of thermal cycles increased. Under continuous heat exposure, 4% (PS-3) BAS in compacted state achieved the maximum reduction in volumetric shrinkage which was 42%. Moreover, under continuous heat exposure, 2% (PS-1) BAS in slurry state achieved the highest reduction in desiccation cracking, which was 73%. The present study highlights the importance of identifying the most effective combination of biochar content and particle size required to achieve a desired outcome, in order to gain the maximum benefit of biochar as an amendment material at the lowest possible cost.

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Anisotropy in volume change behaviour of soils during shrinkage

Cited by 30 publications

References 48 publications

Development and Validation of a New Calibration Model for Diviner 2000® Probe Based on Soil Physical Attributes

Development and Validation of a New Calibration Model for Diviner 2000® Probe Based on Soil Physical Attributes

Kaolin Clay Reinforced with a Granular Column Containing Crushed Waste Glass or Traditional Construction Sands

Effect of biochar on desiccation of marine soils under constant and cyclic temperatures

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