Suction-Controlled Laboratory Test on Resilient Modulus of Unsaturated Compacted Subgrade Soils

Yang, Shu Rong; Lin, Han-Chang; Kung, Johnson H. S.; Huang, Wei

doi:10.1061/(asce)1090-0241(2008)134:9(1375)

Cited by 96 publications

(35 citation statements)

References 7 publications

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“…The pore-air pressure was controlled using the top loading platen which was built in with a porous stone that allowed for application of air pressure to the specimen. The independent control or measurement of pore-air pressure and pore-water pressures by the axis translation technique allows control or measurement of matric suction throughout the tests (Fredlund et al 2012;Yang et al 2008). …”

Section: Axis-translation Technique and Matric Suction Controlmentioning

confidence: 99%

Modelling resilient modulus seasonal variation of silty sand subgrade soils with matric suction control

2014

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Resilient modulus of unbound materials is an important parameter in the mechanistic design of pavements. Although unbound layers are frequently in a partially saturated state, a total stress approach is conventionally used in modelling the material behaviour and therefore pore pressure effects are not considered. In fine-grained unbound materials, the saturation state can affect their mechanical behaviour due to pore pressure effects. In this study a modified test procedure and a predictive resilient modulus model that takes into account the subgrade soil matric suction as a stress state variable is presented. Two different silty sand subgrade materials were tested in unsaturated conditions using series of repeated load triaxial tests under controlled pore suction conditions to study its influence on the resilient modulus. The test data were further used to obtain the resilient modulus model regression parameters that accounts for moisture content variations through the matric suction parameter. Generally, the prediction model could effectively capture the resilient modulus behaviour of the subgrades with respect to changes in the normal stress state and the matric suction. Given the completeness of this method, this prediction model is recommended as an improved approach in capturing the moisture content effects on the material stiffness properties.

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Section: Axis-translation Technique and Matric Suction Controlmentioning

confidence: 99%

Modelling resilient modulus seasonal variation of silty sand subgrade soils with matric suction control

2014

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“…Numerous researchers confirmed that the mechanical and hydraulic behaviors of compacted soils are influenced by soil suction (Chen and Yu [2]; Cui and Delage [3]; Alonso et al [4]; Wheeler and Sivakumar [5]; Ng and Chiu [6]; Rao and Revanasiddappa [7]; Cokca et al [8]; Yang et al [9]; Yang and Lin [10]). In engineering practice, the soil suction has been considered to be an important factor in the design and construction of ascompacted soils (Yang et al [11]; Kung et al [12]).…”

Section: Introductionmentioning

confidence: 99%

Variation of Initial Soil Suction with Compaction Conditions for Clayey Soils

2012

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In this study, the initial soil suction of as-compacted clayey soils was evaluated for various compaction conditions, covering a wide range of compaction energy and molding water content. The soil specimens were prepared by impact compaction under three levels of compaction energy. The filter paper method was used to measure the initial soil suction of as-compacted specimens. Test results indicate that the relationship between the soil suction and the molding water content is bilinear under three different compaction energies. However, the effect of compaction energy on soil suction is different for the soils with different amounts of clay fraction and is elucidated by the macro soil properties. The change of soil suction due to different compaction energies can be predicted by the void ratio and the degree of saturation.

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“…The effect of unsaturated soil behavior on the mechanical properties of compacted pavement materials has been interested increasingly by many researchers. The soil suction, which is the negative pore water pressure, occurring due to presence of water in soil particles has significant effect on the pavement foundation stiffness and strength properties (MnDOT 2007;Yang et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The results indicated that the resilient modulus increased with the increasing of soil suction. Yang et al (2008) developed a suctioncontrolled testing system integrating the resilient modulus test and axis-transition technique to examine the effects of matric suction on the resilient modulus of compacted subgrade soils. The testing system was also created to validate the suitability of the axis-translation technique on the resilient modulus test.…”

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confidence: 99%

Resilient Behaviors of Compacted and Unsaturated Subgrade Materials

Ruttanaporamakul

Rout

Puppala

et al. 2014

Geo-Congress 2014 Technical Papers

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Resilient modulus (M R ) of pavement materials has been used as the important parameter in the design of pavement structure in accordance with the new Mechanistic Empirical Pavement Design Guide (MEPDG) and 1993 AASHTO flexible pavement design guide. This paper studies the M R properties of compacted, unsaturated subgrade materials collected from Minnesota and Louisiana and the effect of compaction moisture content on the M R properties of these soils is also investigated. Initially, the soil samples were tested to determine the soil-water characteristic curves (SWCCs) with Tempe cell method and filter paper technique. Then, M R tests were performed in accordance with the AASHTO T-307-99 standard at five different moisture content-dry density conditions and the soil suctions at the compaction stages were estimated based on the SWCCs information. The testing results indicated that compaction moisture content affects the values of resilient modulus of the subgrade soils. The specimens compacted at dry side of optimum moisture content (OMC) showed higher values of resilient modulus compared with those compacted at OMC and wet side of OMC. In addition, the use of the modified universal model and the model proposed by Cary and Zapata to predict M R value were also studied and analyzed in detail.

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Suction-Controlled Laboratory Test on Resilient Modulus of Unsaturated Compacted Subgrade Soils

Cited by 96 publications

References 7 publications

Modelling resilient modulus seasonal variation of silty sand subgrade soils with matric suction control

Modelling resilient modulus seasonal variation of silty sand subgrade soils with matric suction control

Variation of Initial Soil Suction with Compaction Conditions for Clayey Soils

Resilient Behaviors of Compacted and Unsaturated Subgrade Materials

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