Resilient Properties of Subgrade Soils

Thompson, Marshall R; Robnett, Quentin Laverne

doi:10.1061/tpejan.0000772

Cited by 137 publications

(18 citation statements)

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“…Tuan & Chieu: The Effect of Moisture and Fine Grain Content on the Resilient Modulus of Sandy … pressure, lateral pressure, and lateral compression strength [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: B Factors Affecting Resilient Modulusmentioning

confidence: 99%

The Effect of Moisture and Fine Grain Content on the Resilient Modulus of Sandy Clay Embankment Roadbed

Tuan

Chieu

2021

Eng. Technol. Appl. Sci. Res.

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This paper studies the effect of moisture and fine grain content on the resilient modulus of sandy clay embankment roadbed in the Mekong Delta, Vietnam. The study analyzed the grain content of 30 soil samples on the annually flooded routes of the Mekong Delta according to the AASHTO T88-97 standard. The triaxial compression test at room temperature was used to estimate the resilient modulus of the samples belonging to 6 moisture levels. The experiments were conducted using 3 levels of lateral pressure, 0, 21, and 41kPa. Five deflection stress tests of 14, 28, 41, 55, and 69kPa, were conducted for each lateral pressure. The results showed that as the percentage of grains finer than 0.075mm increased, the variation ratio of the resilient modulus also increased. The content of grains finer than 0.075mm was between 54.1%-93%, while the variation ratio of the resilient modulus ranged between 53.7% and 89.1%. Moreover, as the percentage of grains finer than 0.075mm increased, water absorption capacity increased and resilient modulus decreased. As moisture and fine grain content influence the resilient modulus of the roadbed, this study’s results will help to limit and prevent the erosion of sandy clay embanked roadbeds, especially on frequently flooded areas such as the Mekong Delta.

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Section: B Factors Affecting Resilient Modulusmentioning

confidence: 99%

The Effect of Moisture and Fine Grain Content on the Resilient Modulus of Sandy Clay Embankment Roadbed

Tuan

Chieu

2021

Eng. Technol. Appl. Sci. Res.

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“…It is interesting to note that the stress-dependent model by Uzan [63] applies to both coarse-grained and fine-grained soils [53]. The model includes both the increment of resilient modulus with bulk stress and the reduction with an increase in the deviator stress for the coarse-grained and fine-grained soils, respectively [56,64]. The resilient modulus is a measure of the elastic stiffness of the geomaterials used for the construction of the track substructure [52].…”

Section: Empirical Models For Resilient Modulusmentioning

confidence: 99%

Performance Improvement of Ballasted Railway Tracks Using Geocells: Present State of the Art

Nimbalkar

Punetha

Kaewunruen

2020

Springer Transactions in Civil and Environmental Engineering

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The dramatic increase in the axle load and speed of the rolling stock over the recent years has posed several challenges in terms of maintaining the stability and performance of the railway tracks. Consequently, the rail track engineers are exploring suitable measures to improve the performance of the tracks. The geocells can offer a cost-effective and technically viable alternative for enhancing the track performance. Although the performance of geocells in numerous geotechnical applications such as reinforced retaining walls, slopes, embankments, pavements, etc. is well proven, their application to the railway tracks is still in the nascent stage. The present chapter examines the potential benefits of using geocells in the railway tracks. The results of the numerous experimental, numerical and field studies are critically reviewed. The influence of geocell reinforcement on the parameters (or material properties) essential for the track stability have been discussed. The past studies indicate that the geocells can be effectively used to improve the performance of the railway tracks. The geocells provide confinement which increases the strength and stiffness of the infill materials. Moreover, the geocell reinforcement significantly reduces the irrecoverable deformations of the track granular media, both vertically and laterally. However, the effectiveness of their use is influenced by several parameters such as the properties of the geocell, infill, subgrade and the location of the geocell reinforced layer. This chapter elucidate the role of these influencing parameters in the track stability. Furthermore, the satisfactory performance of geocells in the field substantiates their enormous applications in the railway tracks.

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“…The arithmetic or bilinear model was used in the analysis to define the load-response behavior of the CH subgrade. A standard model for a soft soil based upon the work of Thompson and Robnett ( 6 ) for a similar soil and presented in Huang ( 7 ) was used in the analysis. The coefficients of earth pressure at rest (K 0 ) for the granular materials were estimated from Jaky’s equation, while the coefficient for the CH subgrade was estimated from Brooker and Ireland’s ( 8 ) equation.…”

Section: Analysis Of Reinforced Unpaved Roadsmentioning

confidence: 99%

“…Similar to the ILLIPAVE 2005 analyses, the arithmetic or bilinear model was used in the analyses to define the load-response behavior of the CH subgrade. As previously noted, a standard model for a similar soft soil based upon the work of Thompson and Robnett ( 6 ) was used in the analyses because of inconsistencies in the resilient modulus data for the CH resulting from deformation during testing. Figures 7 and 8 show screen captures of the GT_PAVE input screens.…”

Section: Analysis Of Reinforced Unpaved Roadsmentioning

confidence: 99%

Mechanistic Analyses of Geosynthetic Reinforced Aggregate Road Test Sections

Tingle

2019

Transportation Research Record

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Large-scale laboratory box tests and a full-scale traffic test were performed by the U.S. Army Engineer Research and Development Center to evaluate the performance of geosynthetic reinforced aggregate road sections constructed with marginal base materials over a typical subgrade. The large-scale laboratory testing and full-scale test section included eight different instrumented aggregate road sections including three different aggregate base materials and two different geosynthetics. Mechanistic analyses of each pavement section were conducted using linear elastic, nonlinear elastic, and nonlinear anisotropic models to predict the critical pavement response parameters. The analyses show that mechanistic tools can be effectively used to estimate the critical pavement response parameters for unpaved roads.

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Resilient Properties of Subgrade Soils

Cited by 137 publications

References 0 publications

The Effect of Moisture and Fine Grain Content on the Resilient Modulus of Sandy Clay Embankment Roadbed

The Effect of Moisture and Fine Grain Content on the Resilient Modulus of Sandy Clay Embankment Roadbed

Performance Improvement of Ballasted Railway Tracks Using Geocells: Present State of the Art

Mechanistic Analyses of Geosynthetic Reinforced Aggregate Road Test Sections

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