A new simplified method for calculating consolidation settlement of multi-layer soft soils with creep under multi-stage ramp loading

Feng, Wang; Yin, Jianhua; Chen, Wen Bo; Tan, Dao Yuan; Wu, Pei Chen

doi:10.1016/j.enggeo.2019.105322

Cited by 31 publications

(12 citation statements)

References 33 publications

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“…Contrary to what one expected, the soil settlement is almost not uniform; this can only be explained by the strong soil-structure interaction. Compare to the related works from the literature [44], the total settlement at the surface after 46 years, in the FE analysis, is equal to 1.151 m, and the measured settlement in the field is 1.102 m. In the current study, the values of consolidation settlements are in good agreement with those calculated by Feng et al [44] at 4.5 m depth. However, the slight differences are mainly explained by the applied loading, applied duration and some parameters as those chosen in the soil layer studied.…”

Section: Influence Of the Compressibility Parameters Of The Soilsupporting

confidence: 87%

“…Of these methods, FEM is a very powerful numerical tool for solving complicated 1D consolidation settlement problems. It can handle arbitrary boundary conditions, different loading schemes and it considers the coupling effects of loading and soil consolidation [35,43,44]. For modeling long-term settlements in this case study, FEM method has been used in MATLAB environment.…”

Section: Configuration Testmentioning

confidence: 99%

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Effect of Long-Term Soil Deformations on RC Structures Including Soil-Structure Interaction

Bezih¹,

Chateauneuf²,

Demagh³

2020

Civ Eng J

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Lifetime service of Reinforced Concrete (RC) structures is of major interest. It depends on the action of the superstructure and the response of soil contact at the same time. Therefore, it is necessary to consider the soil-structure interaction in the safety analysis of the RC structures to ensure reliable and economical design. In this paper, a finite element model of soil-structure interaction is developed. This model addresses the effect of long-term soil deformations on the structural safety of RC structures. It is also applied to real RC structures where soil-structure interaction is considered in the function of time. The modeling of the mechanical analysis of the soil-structure system is implemented as a one-dimensional model of a spring element to simulate a real case of RC continuous beams. The finite element method is used in this model to address the nonlinear time behavior of the soil and to calculate the consolidation settlement at the support-sections and the bending moment of RC structures girders. Numerical simulation tests with different loading services were performed on three types of soft soils with several compressibility parameters. This is done for homogeneous and heterogeneous soils. The finite element model of soil-structure interaction provides a practical approach to show and to quantify; (1) the importance of the variability of the compressibility parameters, and (2) the heterogeneity soil behavior in the safety RC structures assessment. It also shows a significant impact of soil-structure interaction, especially with nonlinear soil behavior versus the time on the design rules of redundant RC structures. Doi: 10.28991/cej-2020-03091618 Full Text: PDF

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Section: Influence Of the Compressibility Parameters Of The Soilsupporting

confidence: 87%

Section: Configuration Testmentioning

confidence: 99%

Effect of Long-Term Soil Deformations on RC Structures Including Soil-Structure Interaction

Bezih¹,

Chateauneuf²,

Demagh³

2020

Civ Eng J

View full text Add to dashboard Cite

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“…A different conclusion from Terzaghi's one-dimensional consolidation theory was obtained; that is, the degree of consolidation is also related to the applied time-dependent load. In the same year, a new simplified method was developed to calculate the settlement of multilayer soft soils exhibiting creep subjected to the multistage loading under a onedimensional straining condition [30]. The advantage of this new simplified method is that the soft soils at both the normally consolidated state and overconsolidated state are considered in this approach by the "equivalent time" concept.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Investigation on 1-D Consolidation Permeability of Saturated Clay considering Consolidation Stress Ratio and Stress History

Dang

Gao

et al. 2021

Geofluids

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To study the influence of consolidation stress ratio and stress history on 1-D consolidation permeability of saturated clay, one-dimensional consolidation permeability tests were carried out with GDS triaxial device. The results indicated that the permeability coefficient and void ratio of normally and overconsolidated saturated clay decreased with the increase of consolidation stress ratio under different consolidation stress ratios but the same stress history. And the amount of final sample’s compression increased with the increase of the consolidation stress ratio. Under the condition of the same consolidation stress ratio but different stress history, the amount of final compression of the overconsolidated saturated clay was smaller than that of the normally consolidated saturated clay. Besides, the stress difference σdv between consolidation pressure σ and gravity stress σ c z was fitted to the amount of the final sample’s compression, and a good linear relationship between the stress difference σ d v and the amount of the final sample’s compression under each consolidation pressure was obtained. The results showed that it is necessary to consider the influence of consolidation stress ratio and stress history simultaneously on 1-D consolidation permeability of saturated clay. Meanwhile, it can accurately predict the amount of the final sample’s compression after knowing the gravity stress. Moreover, a model prediction analysis was conducted on the saturated clay and recommended to use the modified Kozeny-Carman’s equation to predict the permeability coefficient of Luochuan saturated clay during one-dimensional consolidation.

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“…In the aspect of soil creep tests, the researches have been conducted on a variety of soils, including coarse-grained soil [2], loess [3][4][5], calcareous sand [6,7], marine soil [8], frozen soil [9][10][11][12]. Abundant literatures about creep characteristics of soft soil [13][14][15][16][17] have been reported due to its obvious creep characteristics with high moisture content and high compressibility. Whereas, as a kind of cohesive soil, little attention has been paid on the creep characteristics of expansive soils, and the studies concerned mainly based on consolidation creep tests [18] and direct shear creep tests [19], rarely on triaxial creep tests.…”

Section: Introductionmentioning

confidence: 99%

Creep Properties of Expansive Soils under Triaxial Drained Conditions and its Nonlinear Constitutive Model

Kong

2021

Period. Polytech. Civil Eng.

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The creep behaviors of expansive soils play an important role in landslide prediction and long-term stability analysis. In this paper, triaxial drained compression creep tests of expansive soils were conducted on the improved stress-controlled triaxial apparatus. The test results show that only transient deformation and attenuation creep occur with low deviator stress, and the increment of axial strain increases exponentially with deviator stress increasing; while deviator stress reaches a certain value, attenuation creep, steady creep and accelerated creep all occur in a creep curve. Meanwhile, the volumetric strain presents the shear shrinkage characteristic at the initial stage of loading, and the shear shrinkage is small. With the extension of loading time, the volumetric strain gradually varies from shear contraction to dilatancy. When entering the accelerated creep stage, the development rate of volumetric strain increases sharply. Besides, isochronous stress-strain curves of expansive soils indicate that their creep process possesses nonlinear characteristics, and the nonlinear degree is related to creep time and stress level. Imitating the empirical formula of cyclic cumulative deformation of clay, a new nonlinear creep model is presented, which may well describe the creep property of expansive soils. Furthermore, critical failure stress could be obtained based on the proposed creep model. The ratio of the critical failure stress to conventional shear failure stress ranges from 70% to 80%, with average of 75.56%, therefore, critical failure stress may be estimated by conventional triaxial tests with the margin of error 5.5% within.

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A new simplified method for calculating consolidation settlement of multi-layer soft soils with creep under multi-stage ramp loading

Cited by 31 publications

References 33 publications

Effect of Long-Term Soil Deformations on RC Structures Including Soil-Structure Interaction

Effect of Long-Term Soil Deformations on RC Structures Including Soil-Structure Interaction

Measurement and Investigation on 1-D Consolidation Permeability of Saturated Clay considering Consolidation Stress Ratio and Stress History

Creep Properties of Expansive Soils under Triaxial Drained Conditions and its Nonlinear Constitutive Model

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