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

Olek, Bartłomiej Szczepan

doi:10.1007/s11440-020-01042-3

Cited by 15 publications

(3 citation statements)

References 64 publications

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“…In order to identify the sigmoid model parameters (a 1 , a 2 , x 0 and n) for each consolidation curve, we used a procedure developed by Olek [51] based on the first-order iterative algorithm to determine the minimum of a function necessary to solve the inverse problem. During the inverse analysis, a given model is calibrated by iteratively changing input values until the simulated output values match the observed data.…”

Section: Discussionmentioning

confidence: 99%

A Consolidation Curve Reproduction Based on Sigmoid Model: Evaluation and Statistical Assessment

Olek

2022

Materials

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In the present study, various shapes of laboratory consolidation curves were numerically reproduced using a four-parametric sigmoid function. Sixteen consolidation curves were selected based on one-dimensional oedometer tests to statistically evaluate the sigmoid model and to determine the appropriate deviation statistics. Comparisons between observed and predicted data were performed using the following statistical metrics: mean error (E), root mean square error (RMSE), mean absolute error (MAE), weighted error (WE), revised Nash–Sutcliffe efficiency index (CE1) and refined index of model performance (dr). The weighted error (WE) was chosen as the optimization target in a first-order iterative optimization algorithm to determine a local minimum of a differentiable function. Comparing the simulated and observed settlements showed close correspondence in the values of CE1 and dr in terms of model performance. Based on statistical assessment, the maximum values of RMSE and MAE for the average degree of consolidation were 0.029 (-) and 0.021 (-), respectively. In turn the settlement data RMSE and MAE were 0.039 mm and 0.025 mm, respectively. These results indicated that the sigmoid expression effectively reproduced the shape of the consolidation curve.

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Section: Discussionmentioning

confidence: 99%

A Consolidation Curve Reproduction Based on Sigmoid Model: Evaluation and Statistical Assessment

Olek

2022

Materials

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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%

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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“…Vinod and Sridharan [16] extended the conventional Asaoka method [17] to evaluate 𝑐 𝑣 and the end-of-primary (EOP) consolidation from the pore water pressure data. In turn, full-matching approaches for laboratory measured pore water pressure were developed by Dobak and Gaszyński [18], Olek [19] and Chow et al [20].…”

Section: Introductionmentioning

confidence: 99%

Archives of Civil Engineering

Olek

2022

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The pattern of pore water pressure dissipation from the one-dimensional consolidation test significantly affects the calculated value of the coefficient of consolidation. This paper discusses the interpretation methodology for laboratory dissipation data from the oedometer test with the pore water pressure measurements or Rowe cell test. In the analysis, the gradient-based algorithm for finding the optimal value of the coefficient of consolidation is used against experimental results, obtained for various fine-grained soils. The appropriate value of coefficient of consolidation is considered as one with the lowest associated error function, which evaluates fitness between the experimental and theoretical dissipation curves. Based on the experimental results, two different patterns of the pore water pressure dissipation are identified, and the saturation of the specimen was found to be the key factor in describing the change in the patterns. For the monotonically decreasing dissipation curve, an inflection point is identified. The values of degree of dissipation at the inflection point are close to the theoretical value of 53.4%.

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

Cited by 15 publications

References 64 publications

A Consolidation Curve Reproduction Based on Sigmoid Model: Evaluation and Statistical Assessment

A Consolidation Curve Reproduction Based on Sigmoid Model: Evaluation and Statistical Assessment

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

Archives of Civil Engineering

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