Estimation of coefficients of consolidation and permeability via piezocone dissipation tests

Jang, Woo Young; Chung, S. G.; Kweon, H. J.

doi:10.1007/s12205-013-1418-2

Cited by 6 publications

(2 citation statements)

References 26 publications

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“…From the set of possible solutions, a target solution is chosen as the one associated with the smallest error (i.e., higher fitness). The principle of the method used is analogous to the piezocone dissipation test methods (e.g., [30][31][32]). As indicated earlier, the main issue in consolidation studies is the theoretical assumption of immediate load transfer to soil skeleton from the pore water after the load's application.…”

Section: Optimization Of the Dissipation Datamentioning

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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Section: Optimization Of the Dissipation Datamentioning

confidence: 99%

Archives of Civil Engineering

Olek

2022

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“…Thus, a novel method is proposed in this study in which a gradient-based algorithm for finding optimal value of c v is incorporated. The principle of the presented method is similar to the piezocone dissipation test method [2,7,10,22,31,55,58] and relates c v to the permeability of the soil rather than to its compressibility. Furthermore, the concept of instantaneous c v was used to illustrate the nonlinear consolidation behaviour and to study the difference in consolidation time at the end of primary consolidation determined by using two types of laboratory data.…”

Section: Introductionmentioning

confidence: 99%

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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Estimation of coefficients of consolidation and permeability via piezocone dissipation tests

Cited by 6 publications

References 26 publications

Archives of Civil Engineering

Archives of Civil Engineering

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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