Determination of quasi-filtration phase of consolidation based on experimental and theoretical course of the uniaxial deformation and distribution of pore pressure

Olek, Bartłomiej Szczepan; Woźniak, Henryk

doi:10.7494/geol.2016.42.3.353

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…The choice of the method for determining the filtration coefficient depends, to a large extent, on the size of the grains, particles, and the associated properties of the soil under investigation. Permeability coefficient determination methods can be divided into the following:  analytical and empirical formulas based on the grain size distribution (Hazena, and Kozeny-Carman formulas [51,52]; Hazen, Slichter, Terzaghi, Beyer, Sauber, Krueger, Kozeny, Zunker, Zamarin, USBR, Alyamani, and Sen, Shepherd, and Loudon [53]; Terzaghi, Kozeny, Carman, Zunker, and Chapuis [54][55][56]; Hazen [57]; Kruger [58]),  laboratory and field tests (in situ permeameter test [59]; Filtration Column [58]; ZWKII apparatus [60]; Oedometer [61], Rowe Cell [39,62])  modelling (mathematical, physical, numerical: using DEM [51; Using FEM [20]; Using LEM, FEM [61]).…”

Section: Methods For the Determination Of The Filtration Coefficientmentioning

confidence: 99%

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Coal Sludge Permeability Assessment Based on Rowe Cell Consolidation, and Filtration Investigations

Adamczyk

Pomykała

2022

Minerals

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In this paper, an attempt has been made to investigate the possibility of using coal sludge to seal a landfill site by presenting the results of their compressibility and permeability tests. Coal sludge is a fine-grained waste from the coal enrichment process, and its permeability is also highly dependent on its degree of consolidation. The tests were carried out in a Rowe Cell, making it possible to determine the water permeability coefficient more precisely by determining the degree of the material consolidation during testing. The test was carried out using backpressure conditions. The test procedure in the Rowe Cell consisted of the following three steps: saturation, consolidation, and filtration. The coal sludge was taken directly from the filter presses as a by-product of the fines’ coal enrichment process. The paper presents the results of the individual stages performed in a Rowe Cell. The consolidation coefficient was determined using three different methods (Casagrande, Taylor, and Robbinson methods). The permeability coefficient was measured by the indirect and the direct method, the results of both were compared. The results (k < 10−9 m/s) indicated that the value of the permeability coefficient responds to the value for isolating barrier materials.

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Section: Methods For the Determination Of The Filtration Coefficientmentioning

confidence: 99%

“…The theory of Terzaghi (1925) is the first solution to consider the rate of uniaxial consolidation of saturated soils [37]. Its assumptions and detailed analysis and solutions of the basic equation are presented by [38,39], among others.…”

Section: Soil Consolidationmentioning

confidence: 99%

Coal Sludge Permeability Assessment Based on Rowe Cell Consolidation, and Filtration Investigations

Adamczyk

Pomykała

2022

Minerals

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“…The determination of c v by an existing methods is attributed to the use of specific points on consolidation curve, while in the GR method, a representative average consolidation rate is considered. Other advantages of the optimisation approach have been pointed out by Olek [48]. After using the compression and pore water pressure data to determine the values of c v , a qualitative assessment regarding which governing factor of consolidation is dominant can be done with the use of the g parameter.…”

Section: Optimisation Msl Consolidation Testsmentioning

confidence: 99%

“…18, there is a clear decreasing trend in the value of EOP time with the increase in vertical effective stress. To identify EOP parameters from a single compression curve, the GR method combined with quasiconstant criterion for c v [44,48] and the CA method were used. The lowest values of EOP times come from the GR method and the highest from the observed completion of dissipation.…”

Section: Experiments In Large-scale Rowe Cellmentioning

confidence: 99%

“…In other respects, research on laboratory measured pore water pressure highlighted that the derived vertical coefficient of consolidation, c v , differs significantly compared to that determined from compression data [14,44,48,49,53,66]. Robinson [51] proposed a linear relationship between pore water pressure and compression for determining c v .…”

Section: Introductionmentioning

confidence: 99%

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Experimental insights into consolidation rates during one-dimensional loading with special reference to excess pore water pressure

Olek

2020

Acta Geotech.

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Consolidation rate has significant influence on the settlement of structures founded on soft fine-grained soil. This paper presents the results of a series of small-scale and large-scale Rowe cell consolidation tests with pore water pressure measurements to investigate the factors affecting the consolidation process. Permeability and creep/resistance structure factors were considered as the governing factors. Intact and reconstituted marine clay from the Polish Carpathian Foredeep basin as well as clay-sand mixtures was examined in the present study. The fundamental relationship correlating consolidation degrees based on compression and pore water pressure was assessed to indicate the nonlinear soil behaviour. It was observed that the instantaneous consolidation parameters vary as the process progresses. The instantaneous coefficient of consolidation first drastically increases or decreases with increase in the degree of consolidation and stabilises in the middle stage of the consolidation; it then decreases significantly due to viscoplastic effects occurring in the soil structure. Based on the characteristics of the relationship between coefficient of consolidation and degree of dissipation at the base, the consolidation range that complies with theoretical assumptions was established. Furthermore, the influence of coarser fraction in clay-sand mixtures in controlling the consolidation rates is discussed. Keywords Clays Á Consolidation Á Data optimisation Á Excess pore water dissipation Á Gradient-based algorithm Á Permeability List of symbols CA Casagrande method c v Coefficient of consolidation c v e Instantaneous coefficient of consolidation based on compression c v u & Bartłomiej Szczepan Olek

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State-of-the-Art Review on Determining One-Dimensional Consolidation Parameters Based on Compression and Distribution of Pore Water Pressure: Coefficient of Consolidation (cv), End of Primary (EOP) Consolidation

Olek

2024

Arch Computat Methods Eng

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Predicting the time rate of consolidation is one of the major aspects of structure design, founded on compressible fine-grained soil. The time to achieve the required advancement of the consolidation process is proportional to the coefficient of consolidation (cv). In practical applications, the settlement rate is directly related to the excess pore water pressure dissipation rate. A plethora of interpretation methods have been proposed for determining consolidation parameters from laboratory one-dimensional consolidation test in the past decades. This state-of-the-art review presents a comprehensive literature study of available approaches for establishing both coefficient of consolidation and end of primary (EOP) consolidation using compression and pore water pressure laboratory data. The classification of the methods has been made to set in order interpretation approaches for future selection and comparisons. The first part of the paper describes approaches based on graphical curve-fitting. This part includes five approaches: square root of time fitting approach, Semi-logarithmic fitting approach, Differential methods, Hyperbolic approach, and approach based on excess pore water pressure dissipation. In addition, a method comparison study has been performed to evaluate the degree of agreement between selected methods statistically. For this purpose, simple regression and Bland & Altman differences analysis have been used. The second part refers to the computational-based approach, covering a wide range of methods centred on full-matching treated by least-squares, correlational equations linking cv with index properties and soft computing approaches. A thorough insight into recently published literature on machine learning and physics-informed deep learning incorporated to derive the representative value of cv has also been compiled.

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Determination of quasi-filtration phase of consolidation based on experimental and theoretical course of the uniaxial deformation and distribution of pore pressure

Cited by 5 publications

References 12 publications

Coal Sludge Permeability Assessment Based on Rowe Cell Consolidation, and Filtration Investigations

Coal Sludge Permeability Assessment Based on Rowe Cell Consolidation, and Filtration Investigations

Experimental insights into consolidation rates during one-dimensional loading with special reference to excess pore water pressure

State-of-the-Art Review on Determining One-Dimensional Consolidation Parameters Based on Compression and Distribution of Pore Water Pressure: Coefficient of Consolidation (cv), End of Primary (EOP) Consolidation

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