Consolidation behaviour of bentonites in the presence of salt solutions

Dutta, Jintu; Mishra, Anil Kumar

doi:10.1016/j.clay.2015.12.001

Cited by 48 publications

(23 citation statements)

References 18 publications

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“…The introduction of saline porewater immediately reduces the void ratio, and consequently decreases the compression index (c c ) and swelling index (c s ), and increases the clay stiffness (E odo ). Similar behavior is found in pure smectite soil [22,23] and in the Lianyugang natural clay [24]. The average change in the compression index (c c ) for smectite soil is 77% [22], which is comparable to that of the Semarang-Demak clay (76-82%).…”

Section: Fabric Analysis Of Semarang-demak Claysupporting

confidence: 63%

“…The increase in the consolidation rate is 1.5 to 1.7 times for the Semarang-Demak clay. In comparison, the increased rate of consolidation is 2.5-3 times for smectite soil and Lianyugang clay [23,24]. The increase in the consolidation rate can be explained by the increase in the hydraulic conductivity (k) caused by the clay fabric change.…”

Section: Fabric Analysis Of Semarang-demak Claymentioning

confidence: 92%

“…Most of the previous studies used a single type of clay mineral or artificial soils, except [21,24], who used natural marine clay. The introduction of saline pore fluid to clay affects the hydro-mechanical properties of single type smectite soils [20,22,23]. However, the effect of salinity on the compressibility of natural clays showed different reactions.…”

Section: Introductionmentioning

confidence: 99%

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A Physical Study of the Effect of Groundwater Salinity on the Compressibility of the Semarang-DemakAquitard, Java Island

et al. 2018

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Semarang-Demak and other cities along the coast of North Java are vulnerable to land subsidence. The presence of saline groundwater in the coastal region is thought to affect the high subsidence rate, in this case the compressibility of the aquitard layer. We aimed to analyze the effects of groundwater salinity on the compression characteristics of the Semarang-Demak clay using physical analysis. Methods included the determination of groundwater salinity, clay mineralogy and fabrics, and consolidation tests under various salinity conditions. The Semarang-Demak clay is dominated by smectite of high activity, and saline clay exists at the depth of 10 to 35 m. Consolidation tests revealed that the increase insalinity increases the average consolidation rate and hydraulic conductivity up to 42% and 37.5%, respectively. Clay fabric analysis showed that the groundwater salinity modified the interconnectivity of pores by changing the fabric into parallel alignments, facilitating faster porewater dissipation, hence the clay is more readily compressed. These findings are useful for explaining the mechanism of the fast-subsiding coastal plains of North Java.

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Section: Fabric Analysis Of Semarang-demak Claysupporting

confidence: 63%

Section: Fabric Analysis Of Semarang-demak Claymentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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A Physical Study of the Effect of Groundwater Salinity on the Compressibility of the Semarang-DemakAquitard, Java Island

et al. 2018

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“…Literature study reveals that, apart from the mechanical factor, the clay consolidation process is also influenced by the clay mineralogy and porewater chemistry [18,19]. Previous studies have showed that inorganic salt solution has a strong impact on the compressibility of clay [20][21][22][23][24][25], which is mainly due to the change of the diffuse double layer thickness at different electrolyte concentration.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the previous studies used a single type of clay mineral or artificial soils, except [21,24] that used natural marine clay. The introduction of saline pore fluid to clay affects the hydro-mechanical properties of single type smectite soils [20,22,23]. However, the effect of salinity on the compressibility of natural clays showed different reactions.…”

Section: Introductionmentioning

confidence: 99%

A physical study of the effect of groundwater salinity on the compressibility of the Semarang-Demak aquitard, Java Island

Sarah¹,

Hutasoit²,

Delinom³

et al. 2018

Preprint

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This article is currently under review oin Journal of Geosciences, MDPI. Authors: Dwi Sarah, Lambok Hutasoit, Robert Delinom, Imam A. Sadisun, Taufiq Wirabuana -- Semarang-Demak and other cities along the coast of North Java are vulnerable to land subsidence. The presence of saline groundwater in the coastal region is thought to affect the high subsidence rate, in this case the compressibility of the aquitard layer. We aimed to analyze the effects of groundwater salinity on the compression characteristics of the Semarang-Demak clay using physical analysis. Methods included the determination of groundwater salinity, clay mineralogy and fabrics, and consolidation tests under various salinity conditions. The Semarang-Demak clay is dominated by smectite of high activity and saline clay exists at the depth of 10 to 35 m. Consolidation tests reveals that the increase of salinity increases the average consolidation rate and hydraulic conductivity up to 42% and 37.5%, respectively. Clay fabric analysis showed that the groundwater salinity modified the interconnectivity of pores by changing the fabric into parallel alignments, facilitating faster porewater dissipation, hence the clay is more readily compressed. These findings are useful for explaining the mechanism of the fast-subsiding coastal plains of North Java.

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Characterization and constitutive modeling of red clay contaminated with ammonium carbonate

Riad

Zhang

et al. 2020

Num Anal Meth Geomechanics

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Conventionally, red clay is used for agricultural purposes in southern China. Fertilizers, especially urea, are commonly introduced into the red clay to improve the crop yields. However, due to the rapid urbanization in China, large areas of lands with red clays have been converted into sites for domestic and industrial constructions. Nevertheless, few researchers focused on the effect of urea on the strength and compressibility of red clay. In this research, the shear strength and compressibility of the red clay saturated by different concentrations of the (NH4)2CO3 solution (urea's hydrolysates) were experimentally investigated using direct shear as well as oedometer tests, respectively. It was noticed that both the shear strength and stiffness of the red clay significantly decreased after exposure to the urea solution. In addition, the micromechanisms of the strength and compressibility of the red clay treated by the (NH4)2CO3 were studied by the scanning electron microscope test and X‐ray diffraction test. Based on the test results, a new model was developed to simulate the chemomechanical behavior of saturated clayey soil by modifying the Barcelona basic model (BBM) for unsaturated soils. The proposed model introduces four additional parameters, compared to the BBM, to account for the nonlinear shear strength behavior of the red clay. This model accounts for most of the complex features related to the strength and stiffness behavior of clayey soils. The parameter calibration procedures, by using the oedometer and direct shear test results, are also presented. To validate the proposed model, experimental results from the literature are considered in which illite clay samples were either mechanically or chemically or both mechanically and chemically loaded. Part of the experimental results is used to calibrate the model parameters and the other part along with the calibrated parameters is used to verify the proposed model. A comparison between experimental data and predicted results demonstrated that the proposed model is able to capture the main features related to the chemomechanical coupling behavior of saturated soils.

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Consolidation behaviour of bentonites in the presence of salt solutions

Cited by 48 publications

References 18 publications

A Physical Study of the Effect of Groundwater Salinity on the Compressibility of the Semarang-DemakAquitard, Java Island

A Physical Study of the Effect of Groundwater Salinity on the Compressibility of the Semarang-DemakAquitard, Java Island

A physical study of the effect of groundwater salinity on the compressibility of the Semarang-Demak aquitard, Java Island

Characterization and constitutive modeling of red clay contaminated with ammonium carbonate

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