Settlement of a railway embankment on PVD-improved Karakore soft alluvial soil

Muhammed, Jemal Jibril; Jayawickrama, Priyantha W.; Teferra, Alemayehu; Özer, Mustafa

doi:10.1016/j.jestch.2020.03.004

Cited by 16 publications

(18 citation statements)

References 32 publications

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“…The background information for the Karakore preloading embankment and Ballina test embankment including vertical soil profile, in-situ and laboratory test data, and results from field instrumentation and monitoring are found in [39] and [21], respectively. The soft layers of Karakore are mainly characterized by ancient alluvial Quaternary deposits, and the soil profile at deeper depths is formed from an older Tertiary Eocene deposits.…”

Section: Description Of the Soft Soil Profiles The Embankments And Fmentioning

confidence: 99%

“…Common soil characterization procedures grain-size analysis, Index tests, consolidation, and triaxial tests, as well as field tests, were conducted at both project sites. Details of the test results for Karakore and Ballina sites are reported in [21,39,49]. Here, for the purpose of comparison, only grain-size analysis, compression, and consolidation test parameters are presented as in Figure 1 and Table 1.…”

Section: Soil Properties Of Karakore and Ballinamentioning

confidence: 99%

“…The probability distribution of parameters is demonstrated for the most influential layers. The most sensitive and influential parameters were identified based on previous work documented in references to [39] and [51] for Karakore and Ballina clays, respectively.…”

Section: Uncertainty In Model Parametersmentioning

confidence: 99%

“…Karakore railway embankment was completed for soft soil improvement as a part of the Awash-Kombolcha-Haragebaya (AKH) railway project, Wollo Province, Ethiopia. The railway project covers 390 km length and traverses on several topographic conditions, including soft grounds found in Karakore and its vicinity [39]. Muhammed et al [39] presented the deterministic settlements using Class A and Class C predictions for the Karakore soft soil.…”

Section: Introductionmentioning

confidence: 99%

“…The railway project covers 390 km length and traverses on several topographic conditions, including soft grounds found in Karakore and its vicinity [39]. Muhammed et al [39] presented the deterministic settlements using Class A and Class C predictions for the Karakore soft soil. The Ballina test embankment is located in Ballina, New South Wales (NSW), Australia.…”

Section: Introductionmentioning

confidence: 99%

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Uncertainty Analysis in Prediction of Settlements for Spatial Prefabricated Vertical Drains Improved Soft Soil Sites

2020

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This paper presents the quantification of uncertainties in the prediction of settlements of embankments built on prefabricated vertical drains (PVDs) improved soft soil deposits based on data collected from two well-documented projects, located in Karakore, Ethiopia, and Ballina, Australia. For this purpose, settlement prediction biases and settlement distributions were statistically computed based on analyses conducted on two Class A and Class C numerical predictions made using PLAXIS 2D finite element modelling. From the results of prediction bias, Class C predictions agreed well with the field measured settlements at both sites. In Class C predictions, the computed settlements were biased to the measured values. For Class A predictions, the calculated settlement values were in the range of mean and mean minus 3SD (standard deviations) for Karakore clay, and they were within mean and mean minus 2SD limit for the Ballina soil. The contributing factors to the settlement uncertainties of the Karakore site may include variability within the soil profile of the alluvial deposit, particularly the presence of interbedded granular layer within the soft layers, and the high embankment fills, and the limited number of samples available for laboratory testing. At the Ballina test embankment site, the uncertainties may have been associated with the presence of transitional layers at the bottom of estuarine clay and sensitivity of soft soil to sample disturbances and limitations in representing all the site conditions.

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Section: Description Of the Soft Soil Profiles The Embankments And Fmentioning

confidence: 99%

Section: Soil Properties Of Karakore and Ballinamentioning

confidence: 99%

Section: Uncertainty In Model Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Uncertainty Analysis in Prediction of Settlements for Spatial Prefabricated Vertical Drains Improved Soft Soil Sites

2020

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Numerical Modeling of Mumbai Marine Clay Improved with Prefabricated Vertical Drain

Sadiq,

Alam

2024

Lecture Notes in Civil Engineering

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An experimental investigation of the influence of plasticity on creep degradation rate

Olek

2021

Acta Geotech.

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Intrinsic soil properties, such as the Atterberg limits, are essential factors influencing the mechanical behaviour of the fine-grained soils. In this study, a series of long-term multiple-stage loading oedometer tests were performed on alluvial organic soils to investigate the creep behaviour. The plasticity ratios ranged from 0.4 to 0.63. The smaller value of the plasticity ratio Rp indicated higher soil plasticity. The results showed that the coefficient of secondary compression Cαe of alluvial organic soils was stress- and strain-rate-dependent. The coefficient of secondary compression change index m was derived using a double-logarithmic approach for a creep degradation and was related to the plasticity and clay percentage to fines. Based on the results, it was found that high plasticity soils exhibit slow creep degradation rate during one-dimensional straining under normally consolidated state. The results show that the higher soil plasticity expressed by the plasticity index, plasticity ratio and clay percentage to fines, smaller the coefficient of secondary compression change index. Moreover, the correlations among a soil plasticity properties and creep parameters for the alluvial soils have also been proposed.

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Settlement of a railway embankment on PVD-improved Karakore soft alluvial soil

Cited by 16 publications

References 32 publications

Uncertainty Analysis in Prediction of Settlements for Spatial Prefabricated Vertical Drains Improved Soft Soil Sites

Uncertainty Analysis in Prediction of Settlements for Spatial Prefabricated Vertical Drains Improved Soft Soil Sites

Numerical Modeling of Mumbai Marine Clay Improved with Prefabricated Vertical Drain

An experimental investigation of the influence of plasticity on creep degradation rate

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