Effects of confining pressure and water content on performance of unsaturated compacted clay under repeated loading

Sivakumar, V.; Kodikara, Jayantha; O'Hagan, R; Hughes, David; Cairns, Paul; McKinley, J. D.

doi:10.1680/geot.10.p.103

Cited by 44 publications

(21 citation statements)

References 18 publications

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“…However, soil suction measurements from these methods are user dependent, sensitive to testing protocols, and neglect the influence of the applied stress on the (Ng and Pang 2000;Power et al 2008;Power and Vanapalli 2010;Ng et al 2012). In recent years, modified cyclic triaxial testing systems equipped with various techniques (e.g., thermal dissipation sensor, psychrometer, suction probe, axis-translation technique) are used to measure or control the soil suction during the RLTTs for obtaining reliable testing results (Gupta et al 2007;Yang et al 2008;Craciun and Lo 2010;Cary and Zapata 2011;Ng et al 2013;Sivakumar et al 2013). Trained professionals are required to conduct these tests.…”

Section: Experimental Determination Of M R -Relationshipsmentioning

confidence: 99%

“…Extensive experimental investigations were conducted by several researchers during the past decade using advanced testing techniques to measure the M R -relationships and propose models for predictions (Khoury and Zaman 2004;Yang et al 2005Yang et al , 2008Liang et al 2008;Sawangsuriya et al 2009;Craciun and Lo 2010;Cary and Zapata 2011;Nowamooz et al 2011;Azam et al 2013;Ng et al 2013;Sahin et al 2013;Sivakumar et al 2013;Salour et al 2014). These studies have provided valuable information for better understanding the influence of the on the M R .…”

Section: Introductionmentioning

confidence: 99%

“…(iv) Several investigators reported that the soil suction decreases during the application of the cyclic loading(Yang et al 2008;Craciun and Lo 2010;Sivakumar et al 2013). Such behavior can…”

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confidence: 99%

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Model for predicting resilient modulus of unsaturated subgrade soil using soil-water characteristic curve

Han

Vanapalli

2015

Can. Geotech. J.

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Soil suction () is one of the key factors that influence the resilient modulus (M R ) of pavement subgrade soils. There are several models available in the literature for predicting the M R -correlations. However, the various model parameters required in the existing models are generally determined by performing regression analysis on extensive experimental data of the M Rrelationships, which are cumbersome, expensive, and time-consuming to obtain. In this paper, a model is proposed to predict the variation of the M R with respect to the for compacted fine-grained subgrade soils. The information of (i) the M R values at optimum moisture content condition (M ROPT ) and saturation condition (M RSAT ), which are typically determined for use in pavement design practice; (ii) the values at optimum moisture content condition ( OPT ); and (iii) the soil-water characteristic curve (SWCC) is required for using this model. The proposed model is validated by providing comparisons between the measured and predicted M R -relationships for 11 different compacted fine-grained subgrade soils that were tested following various protocols (a total of 16 sets of data, including 210 testing results). The proposed model was found to be suitable for predicting the variation of the M R with respect to the for all the subgrade soils using a single-valued model parameter , which was found to be equal to 2.0. The proposed model is promising for use in practice, as it only requires conventional soil properties and alleviates the need for experimental determination of the M R -relationships.Résumé : La succion des sols () est l'un des facteurs clés qui influence le module réversible (M R ) du sol de fondation des chaussées. Il existe plusieurs modèles dans la littérature pour prédire la corrélation entre M R et . Cependant, les différents paramètres nécessaires pour les modèles existants sont généralement évalués par des analyses de régression sur des ensembles substantiels de données expérimentales reliant le M R à ce qui est encombrant, coûteux et fastidieux à obtenir. Dans cet article, un modèle est proposé pour prédire la variation du M R en fonction de la pour des sols de fondation à grain fin compactés. Les informations dérivant de (i) les valeurs de M R à la teneur en eau optimale (M ROPT ) et à l'état de saturation (M RSAT ) qui sont généralement déterminées dans la pratique de la conception des chaussées conventionnelles, (ii) les valeurs de à la teneur en eau à optimale ( OPT ), et (iii) la courbe de rétention d'eau (CRE) sont nécessaires pour utiliser ce modèle. Le modèle proposé est validé à l'aide de comparaisons entre les valeurs mesurées et prévues de la relation M R -pour 11 différents sols de fondation à grains fins compactés qui ont été testés suivant divers protocoles (un total de 16 ensembles de données incluant 210 résultats). Le modèle proposé s'est révélé être approprié pour prédire la variation du M R en fonction de pour tous les sols de fondation au moyen d'un seul paramètre , qui s'est avéré être égal a 2.0. Le modè...

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Section: Experimental Determination Of M R -Relationshipsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Model for predicting resilient modulus of unsaturated subgrade soil using soil-water characteristic curve

Han

Vanapalli

2015

Can. Geotech. J.

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“…Along with the publishing of Fredlund's book "Unsaturated Soil Mechanics" [1] and a large number of studies, the concept that the suction is a key element to influence the strength, deformation and seepage process of unsaturated soil has been established [2]. Many experts and scholars studied the characteristics of unsaturated soil based on the concept of suction, a lot of achievements were made [3][4][5][6][7][8][9][10][11]. As far as the remolded loess in the filling area of new urban district construction in Yan'an is concerned, the experimental study on the basis of theory of unsaturated soil is not common in the literature.…”

Section: Introductionmentioning

confidence: 99%

Test Study on Consolidation Character of Unsaturated Loess

Sheng-xia¹,

Dong²,

Wen-li³

2017

dteees

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Abstract. To calculate accurately settlement of loess foundation in filled area as the main goal, disturbed loess of filled project in Yan'an new district engineering construction in China as the research object, Q 3 disturbed loess samples were made indoor for consolidation test by the reference of geotechnical engineering design parameters of filled project loess in actual practical project. Four groups of unsaturated consolidation tests were carried out with matric suction ranging from 100kPa to 500kPa. Compressive curve of the unsaturated and undisturbed loess sample were obtained. The influence of matric suction to consolidation characteristics of disturbed loess was analyzed. Results show: (1) For same initial state disturbed loess soil samples, when matric suction increases from 100kPa to 500kPa, the compressibility coefficient reduces from 0.151MPa -1 to 0.095MPa -1 . Compressibility coefficient reduces with increasing the matric suction; (2) Compression index of unsaturated and disturbed loess sample was influenced not only by vertical pressure but also by matric suction. Compressibility index reduces when the matric suction increase; (3) The total vertical strain of disturbed loess sample which control parameters referred to the actual geotechnical engineering design plan was small under the 2MPa vertical stress. The biggest vertical strain was 0.7%.

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“…Khoury & Zaman, 2004;Sivakumar et al, 2013). The resilient modulus and accumulated axial plastic strain of each specimen were then measured during cyclic loading-unloading (e.g.…”

Section: Introductionmentioning

confidence: 99%

Cyclic behaviour of an unsaturated silt at various suctions and temperatures

Zhou

2014

Géotechnique

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Subgrade soils are constantly subjected to daily variations of temperature and suction in the field. Their deformation under cyclic traffic loads can greatly affect the performance of a pavement. Yet, the behaviour of unsaturated subgrade soils under cyclic loads at various temperatures and suctions is not fully understood. In this study, a new suction-and temperature-controlled cyclic triaxial apparatus was developed. Using temperature-compensated Hall effect transducers, the accumulated plastic axial and volumetric strains and resilient modulus of an unsaturated silt under cyclic loads were measured at suctions ranging from 0 to 60 kPa and temperatures ranging from 20 to 608C. Experimental results show that yield stress increases with increasing suction (suction-induced hardening), but decreases with increasing temperature (thermal-induced softening). Consequently, axial plastic strain accumulated during cyclic loading-unloading is larger at lower suctions and higher temperatures. At a given temperature, measured resilient modulus significantly increases when suction increases. On the other hand, the influence of temperature on resilient modulus depends on suction level. At zero suction, resilient modulus is slightly affected by temperature. At suction larger than zero, an increase in temperature induces an obvious decrease in resilient modulus. It is evident that thermal effects on resilient modulus are more significant at unsaturated than saturated states.

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Effects of confining pressure and water content on performance of unsaturated compacted clay under repeated loading

Cited by 44 publications

References 18 publications

Model for predicting resilient modulus of unsaturated subgrade soil using soil-water characteristic curve

Model for predicting resilient modulus of unsaturated subgrade soil using soil-water characteristic curve

Test Study on Consolidation Character of Unsaturated Loess

Cyclic behaviour of an unsaturated silt at various suctions and temperatures

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