Estimation of preconsolidation stress of clays from piezocone by means of high-quality calibration data

D’Ignazio, Marco; Lunne, Tom; Andersen, Knut H.; Yang, Shuolong; Buò, Bruno Di; Länsivaara, Tim

doi:10.3934/geosci.2019.2.104

Cited by 12 publications

(3 citation statements)

References 11 publications

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“…As a consequence of different environmental depositional conditions, the soft, sensitive clay deposits located worldwide are characterized by different mineralogical and mechanical characteristics. For example, Finnish clays show high plasticity and clay content [5][6][7].…”

Section: Soft Sensitive Claysmentioning

confidence: 99%

Lime Treatment of a Soft Sensitive Clay: A Sustainable Reuse Option

et al. 2020

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This paper presents the results of research aimed at studying the hydraulic and mechanical behavior of Finnish soft clays treated by quicklime. This research investigated the effect of water content and curing time on the characteristics of the compacted soil treated with 7% lime, with the aim of verifying the effectiveness of lime treatment and evaluating its possible re-use, thus avoiding landfill disposal. A laboratory-testing program was carried out both on treated and untreated soil, supported by microstructural investigation. Results have shown a general increase of the hydraulic conductivity due to the addition of lime, reduction of compressibility, and increase in the soil shear strength for a wide range of water contents (10%–40%), proving the effectiveness of the lime treatment. Lime addition to the compacted clay at high water contents (90%–130%) turned out to improve the mechanical characteristics to a lesser extent, while fractionated lime supply did not significantly improve the mechanical performance. The results of this research demonstrate that the re-use of sensitive clays, typically of high water contents, by lime addition require a drying process. Different drying procedures can be adopted (proposed in the paper) depending on the specific site conditions. However, the soil treatment is generally economically convenient in comparison to the disposal in waste landfills, which would represent the only alternative solution.

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Section: Soft Sensitive Claysmentioning

confidence: 99%

Lime Treatment of a Soft Sensitive Clay: A Sustainable Reuse Option

et al. 2020

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“…The clayey soils mostly have soft and sensitive nature that is related to and controlled by depositional and post-depositional factors [9]. As such, the main depositional factor is the inter-particle flocculation that creates an open micro-structure in such soils.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Lime stabilization of clayey landfill base liners: Consolidation behavior and hydraulic properties

Karademir

2022

Environmental Research and Technology

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Lime soil treatment is a chemical process in which lime (quicklime, hydrated lime or lime slurry) is mixed with the in place subgrade soil and a chemical reaction takes place. The lime reacts with the clay particles in the soil to create a cementitious matrix. The design of landfill base liners including a clay layer as a fluid barrier (i.e. water-resistant impervious layer) requires a neat engineering approach considering, in particular, consolidation behavior as well as hydraulic properties of the clay contained. For sake of safe and stable design of such baseliners under the landfills, the reduction of consolidation settlement in clay when subjected to the accumulated waste load (i.e. superposed action) during operation as well as the accomplishment for ensuring the waterproof of those composite base liners (comprised of multiple different layers) not to allow the penetration of the contaminated water -produced as a result of exothermic reactions occurring in the waste body in landfills -by enabling enhanced isolation from the natural ground is of importance. In light of this, in order to address those two most important design concerns (i.e. Consolidation and Hydraulic Properties of Clay) as well as to in an attempt to develop an enhanced clay layer system for landfill baseliners that has a greater bearing capacity (i.e. load resistance), and hence, more robust against settlements, and additionally, possessing improved hydraulic properties by being relatively more water-resistant and greatly impermeable, a series of consolidation tests were performed in the laboratory at different lime contents (lime/lime-clay mixture proportions by weight: 0%, 10%, and 20%) on clay specimens to investigate the stabilization and improvement of clayey landfill baseliners. Lime treatment on clay specimens has shown as a result of the experimental program that the strength of clay against loading improves, and further, exhibits less vertical deformation (settlement) under the load owing to an increase in lime content. Moreover, the clay becomes highly impermeable and displays substantially larger water-resistant properties because of increased lime mass proportion in clayey soil. The findings of the experimental program demonstrate that lime stabilization of the clayey soils in landfill baseliners will benefit the bearing capacity and the imperviousness (water tightness) engineering design properties as compared to standard composite multi-layered landfill baseliner systems.

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“…Researchers said that the pre-consolidation stress values and the consolidation curves are slightly influenced by the separation of strains method applied. D'Ignazio et al investigated pre-consolidation stress of clays from piezocone [18]. This purpose was used as a multivariate database consisting of numerous high-quality onshore and offshore clay data points in this paper.…”

Section: Introductionmentioning

confidence: 99%

Determination of Pre-Consolidation Pressure by Different Method

Ural¹,

Küçüker²

2021

J. Civ. Eng. Constr.

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One of the most important soil problems seen on fine-grained soils is the settlement problem. The primary consolidation settlement shows itself over time with the effect of water. Also, the settlement properties of soil change depending on the stress history. In this study, silt mixtures with three different sand percentages were prepared using the slurry sludge preparation method under 50kPa load, and pre-consolidation pressures were calculated by performing the oedometer experiment on the obtained samples. Using the collected oedometer data, the pre-consolidation pressures were calculated and compared by six different methods. As a result, the results equal to the vertical stress values applied for the three mixtures were obtained by Butterfield and Tavenas methods. Sand content was effective in Casagrande, Van Zelst, and Janbu methods, but not in Butterfield, Tavenas, and Shmertman.

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Estimation of preconsolidation stress of clays from piezocone by means of high-quality calibration data

Cited by 12 publications

References 11 publications

Lime Treatment of a Soft Sensitive Clay: A Sustainable Reuse Option

Lime Treatment of a Soft Sensitive Clay: A Sustainable Reuse Option

Lime stabilization of clayey landfill base liners: Consolidation behavior and hydraulic properties

Determination of Pre-Consolidation Pressure by Different Method

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