Undrained Cyclic and Monotonic Strength of Sand-Silt Mixtures

Dash, H. K.; Sitharam, T. G.

doi:10.1007/s10706-011-9403-3

Cited by 19 publications

(4 citation statements)

References 13 publications

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“…4, maximum dry density increased with increase in silt content thereafter decreased; on the other hand minimum dry density decreased with increase in silt content. This minimum dry density line (decreasing with increase in silt content) was different from other researcher [19,20,33], because the minimum density tests were conducted by Water method. …”

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confidence: 67%

“…Belkhatir et al [17,18] imply that the strength silty sand up to 50% fines content is less then that of the clean sand for constant dry density approach. Dash and Sitharam [19,20] proposed that the strength parameter initially increases till 5% silt content and thereafter decreases rapidly till around the limiting fines content (LFC) (explained in "Limiting fines content") and finally remain relatively constant for all the silt contents till even pure silt at constant relative density approach, though Karim and Alam [21] found this peak (for 5% silt content) when the specimens were prepared by air pluviation method not for moist temping method.…”

Section: Introductionmentioning

confidence: 99%

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Effect of nonplastic silt content on undrained shear strength of sand–silt mixtures

Karim

Alam

2017

Geo-Engineering

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IntroductionNonplastic silt is a common alluvial deposit in the flood plain of Bangladesh. It is finer than sand and behaves like sand but different from elastic silt and clay. Sand and nonplastic silt are liquefiable whereas clay and elastic silt are not liquefiable. On the other hand, nonplastic silt content in sand-silt mixtures controls the behavior of the soil under monotonic and cyclic loading. Many researches are found in literature on the effect of nonplastic silt content in sand-silt mixtures. But, their findings are sometimes contradicts each other. Therefore, it is necessary to study the topic more. Moreover, design engineers are not aware of the behavior of nonplastic silt-sand mixtures.As a result of build-up of excess pore water pressure, the effective confining pressure decreases σ ′ = σ − u triggering liquefaction. Due to the lack of drainage within very short time during earthquake, this phenomenon mainly occurs and thus the undrained testing is commonly employed by the researchers to study the liquefaction behavior of soil. AbstractTo assess the behavior of sand-silt mixtures, strain-controlled monotonic triaxial tests were conducted on sand-silt mixtures of specimen size 71 mm in diameter and 142 mm in height at various relative densities but same isotropic effective confining pressure of 100 kPa. Concept of limiting fines content (LFC) was verified by these undrained monotonic triaxial tests. LFC was found to be the very important parameter to understand the behavior of sand-silt mixtures. The behavior of sand-silt mixture changes approximately at LFC. At constant relative density, increase in silt content decreases the undrained peak shear strength till LFC. After LFC the strength becomes near about same till pure silt sample. The reason of behavior could not be explained. At constant global void ratio, the peak shear strength decreases with increase in silt content till LFC and for further increment of silt content the peak shear strength increases. Sand-silt mixtures containing certain amount of silt which is near to the LFC showed flow type as well as brittle behavior. Failure of structure on this type of soil will be catastrophic during earthquake. In the case of permeability decreased with increasing silt content up to LFC. After the LFC, dry density is decreasing with increasing silt content but permeability remains constant till pure silt.Keywords: Liquefaction, Nonplastic silt, Peak shear strength, Limiting fines content, Relative density Open Access© The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Karim and Alam Geo-Engineering (2017) Karim and Alam Geo-Engineering (2017) 8:14 Liquefaction behavior by cyclic loading wa...

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confidence: 67%

Section: Introductionmentioning

confidence: 99%

Effect of nonplastic silt content on undrained shear strength of sand–silt mixtures

Karim

Alam

2017

Geo-Engineering

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“…Moreover, it is shown that at a given density, CRR 15 decreases with increasing p 0 and that the effect of p 0 on CRR 15 diminishes with increasing f c . The existence of f c,th , has also been observed in previous studies on the effect of f c on the behaviour of sand with fines [38][39][40][41][42][43][44]. The f c,th is an important parameter determining the transition from the sand-dominated to the silt-dominated behaviour of mixtures and is related to their particle packing, mean diameter ratio, and separation distance as well as gradation, mineralogy, and particle shape characteristics [45].…”

Section: Liquefaction Resistancesupporting

confidence: 56%

Laboratory-Based Correlation between Liquefaction Resistance and Shear Wave Velocity of Sand with Fines

Papadopoulou¹,

Tika²

2021

Geotechnics

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This paper presents the results of a laboratory investigation into the effect of non-plastic fines on the correlation between liquefaction resistance and the shear wave velocity of sand. For this purpose, undrained stress-controlled cyclic triaxial and bender element tests were performed on clean sand and its mixtures with non-plastic silt. It is shown that the correlation between liquefaction resistance and shear wave velocity depends on fines content and confining effective stress. Based on the test results, correlation curves between field liquefaction resistance and overburden stress corrected shear wave velocity for sand containing various contents of fines are derived. These curves are compared to other previously proposed by field and laboratory studies.

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“…Consideration of this natural trend and questions regarding silt influence on engineering behavior of sandy soils has triggered the research on silty sands in recent years. Many investigators (Kuerbis et al ,1998;Pitmanet al,1994;Lade and Yamamuro,1997;Thevanayagam, 1998;Salgado et al,2000;Thevanayagam et al ,2002;Ni et al, 2004;Murthy et al, 2007;Monkul, et al, 2011;and Dash, et al, 2011) have conducted experiment on sand with amount of silt and studied their the stress-strain behavior.…”

Section: Introductionmentioning

confidence: 99%

A Simple One-Scale Constitutive Model for Static Liquefaction of Sand-Silt Mixtures

Liu

Chang

2016

Lat. Am. j. solids struct.

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Instability of liquefaction is one of the major reasons which results in the failure of earth structure such as dam. The present study focuses on the simulation of static liquefaction behavior for granular materials such as sand and sand-silt mixtures. Based on micromechanical analysis of inter-particle behavior, a simple one-scale model is proposed to simulate the stress-strain response of sand; then the proposed model is extended to simulate the sand-silt mixtures using the mixture theory combining the properties of sand and silt according to their proportions. Empirical expressions are introduced to fit the critical state strength and the location of the critical state line for each mixture. Parameters of the model can be divided into two categories: the first seven parameters have the same values either with pure sand or pure silt for silt-sand with any given fines content; the other three parameters are the function of fines content and three more parameters are required to estimate their values. The predicted results of triaxial test of sand and sand-silt mixtures with different fine content, which has a good agreement with the results of laboratory tests, suggest that the proposed model can simulate static liquefaction behavior of sand and sand-silt mixtures.

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Undrained Cyclic and Monotonic Strength of Sand-Silt Mixtures

Cited by 19 publications

References 13 publications

Effect of nonplastic silt content on undrained shear strength of sand–silt mixtures

Effect of nonplastic silt content on undrained shear strength of sand–silt mixtures

Laboratory-Based Correlation between Liquefaction Resistance and Shear Wave Velocity of Sand with Fines

A Simple One-Scale Constitutive Model for Static Liquefaction of Sand-Silt Mixtures

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