Closure to “Secondary Compression” by G. Mesri and B. Vardhanabhuti

Mesri, G.; Vardhanabhuti, Barames

doi:10.1061/(asce)1090-0241(2006)132:6(817)

Cited by 15 publications

(3 citation statements)

References 2 publications

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“…This question remains controversial among researchers. Mesri and Godlewski , Choi , Feng , Mesri and Vardhanabhuti , and Mesri , supporting Hypothesis A, believed that soil is compressed for two interrelated reasons: ( i ) the change of effective stress, ( ii ) the change of time. Meanwhile, Bjerrum , Stolle et al , Vermeer and Neher , Nash and Ryde , Yin et al , Leroueil , Leoni et al , Karim et al , Nash and Brown used Hypothesis B to consider that the creep occurs during the consolidation stage.…”

Section: Introductionmentioning

confidence: 73%

A new simplified Hypothesis B method for calculating consolidation settlements of double soil layers exhibiting creep

Feng

Yin

2016

Num Anal Meth Geomechanics

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Summary This paper presents a new simplified method, based on Hypothesis B, for calculating the consolidation settlements of double soil layers exhibiting creep. In the new simplified Hypothesis B method, different stress–strain states including over‐consolidation and normal consolidation states can be considered with the help of the ‘equivalent time’ concept. Zhu and Yin method and US Navy method are adopted to calculate the average degree of consolidation for a double soil layer profile. This new simplified Hypothesis B method is then used to calculate the consolidation settlements of double soil layers, which have two different total thicknesses of soil layer (4 m and 8 m) and three different OCR values (Over‐Consolidation Ratio, OCR = 1, 1.5 and 2). The accuracy and verification of this new simplified method are examined by comparing the calculated results with simulation results from a fully coupled finite element (FE) program using a soft soil creep model. Four cases of double layer soil profiles are analyzed. Hypothesis A method with US Navy method for the average degree of consolidation has also been used to for calculating consolidation settlements of the same cases. For Case I(4m) and Case III(8m), it is found that curves of the new simplified Hypothesis B method using both Zhu and Yin method and US Navy method are very close to the results from FE simulations with the relative errors within 8.5%. For Case II(4m) and Case IV(8m), it is found that curves of the new simplified Hypothesis B method using Zhu and Yin method agree better with results from FE simulations with the relative errors within 11.7% than curves of the new simplified Hypothesis B method adopting US Navy method with the relative error up to 36.1%. Curves of Hypothesis A method adopting US Navy method have the relative error up to 55.0% among all four cases. In overall, the new simplified Hypothesis B method is suitable for calculation of consolidation settlements of double soil layers exhibiting creep, in which, Zhu and Yin method is recommended to obtain the average degree of consolidation. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 73%

A new simplified Hypothesis B method for calculating consolidation settlements of double soil layers exhibiting creep

Feng

Yin

2016

Num Anal Meth Geomechanics

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“…However, there are two different hypotheses about whether there is creep in the main consolidation. Leonards [1], Ladd et al [2], and Mesri [3,4] adhere to hypothesis A through experimental studies. And they believe that the creep deformation only occurs the duration of primary consolidation.…”

Section: Introductionmentioning

confidence: 99%

A Practical Design Method to Determine the Replacement Time of Light Embankment

Zhou

Tang-dai

et al. 2022

Geofluids

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If the settlement of bridgehead transition section of expressway is too large, it often causes frequent vehicle jumping at bridgehead and endangers passenger safety. The engineering practice has proved that the lightweight embankment replacement technology can reduce the postconstruction settlement effectively, thus reducing the occurrence of bridgehead jump. The key of filling technology of lightweight embankment is the design of filling thickness and the selection of filling time. This paper deduced how to determine the replacement time of lightweight embankment in practical engineering. In order to apply to engineering practice more conveniently, this paper made the following assumptions: (1) For normally consolidated soil, the elastoplastic deformation at any point of soil under external load can be equivalent to the sum of instantaneous elastic deformation and creep based on equivalent time. The corresponding pore ratio change also has corresponding equivalent relation. (2) The increase of equivalent time is ignored during unloading, filling, and paving process. Based on the above two assumptions, according to 1D EVP model and the conception of equivalent time, the unloading time and filling time of light embankment for layered soil foundation are deduced. It is applied to the design and calculation of the supporting project.

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“…Recently, Yin and Feng (2017) proposed a new simplified method to calculate the long-term consolidation settlement of clayey soils with creep subjected to an instant loading. In history, there is a controversy on the relation of consolidation and creep: Hypothesis A regards that the creep only occurs after the consolidation of soils (Mesri and Vardhanabhuti 2005;Mesri 2009). Comparatively, Hypothesis B supports that the creep happens both during and after the consolidation stage (Bjerrum, 1967;Stolle et al, 1999;Nash and Ryde, 2001;Yin andGraham, 1989, 1994;Yin, et al, 2002;Nash and Brown, 2013;Degago, et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Case study on long-term ground settlement of reclamation project on clay deposits in Nansha of China

Feng

Xian-chang

Yin

et al. 2019

Marine Georesources & Geotechnology

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In the design of reclamation, long-term settlement is seriously concerned. This paper presents a case study on the ground settlement of a reclamation project in Nansha, China. Fourteen undisturbed soil samples were taken at different depths from this site. Both oedometer tests on fourteen specimens and triaxial hydraulic conductivity tests on nine specimens were conducted. Finite element (FE) modellings using soft soil creep (SSC) model or soft soil (SS) model for modelling clayey soils with or without creep and the calculation using a new simplified method were performed to analyze the consolidation settlement of clay deposits subjected to filled loadings. The FE simulated results and calculated results from the new simplified method were compared with the monitored data in the field. Results show that the curves of the FE modelling using SSC model and the calculation from new simplified method have the same trends as those of the measured settlements. The creep contributes to excess pore pressure dissipation during the consolidation. Furthermore, ground settlements of the reclamation are predicted with the aid of the FE and new simplified method analysis. These predictions can provide the essential information for engineers to control or reduce the settlement in future.

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Closure to “Secondary Compression” by G. Mesri and B. Vardhanabhuti

Cited by 15 publications

References 2 publications

A new simplified Hypothesis B method for calculating consolidation settlements of double soil layers exhibiting creep

A new simplified Hypothesis B method for calculating consolidation settlements of double soil layers exhibiting creep

A Practical Design Method to Determine the Replacement Time of Light Embankment

Case study on long-term ground settlement of reclamation project on clay deposits in Nansha of China

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