Design of Granular Pavement Layers Considering Climatic Conditions

Werkmeister, S; Numrich, Ralf; Dawson, Andrew; Wellner, Frohmut

doi:10.3141/1837-07

Cited by 27 publications

(16 citation statements)

References 3 publications

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“…The influence of water content on the mechanical behaviour of granular materials under cyclic loading has been observed experimentally in several studies [39][40][41][42]. The results obtained in this study on the interlayer soil are in agreement with these works.…”

Section: Mechanical Behavioursupporting

confidence: 82%

Unsaturated railway track-bed materials

Cui

2016

E3S Web Conf.

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Abstract. Railway track-bed materials are mostly in unsaturated state, and their hydro-mechanical properties depend strongly on their water contents or suctions. In France, problematic soils such as collapsible loess and swelling marl can be origin of instability problems for new lines for high speed trains, while the hydro-mechanical behaviour of interlayer soil formed mainly by interpenetration of ballast and subgrade soil is of concern for conventional lines. In the latter case, the main challenge relies in the large variability of the interlayer soils owing to the variability of natural subgrade soils involved in the railway network. In this paper, a study on interlayer soils is presented, that covers a large spectrum of aspects: geotechnical/geophysical site characterisation, laboratory investigation into the hydraulic behaviour and mechanical behaviour as well as the mud pumping/interlayer creation phenomena, and field monitoring. The combined effect of water content and fines content were emphasized in the laboratory investigation, whilst interaction between atmosphere and track was focused on in the field monitoring. The results show clearly that it is of paramount importance to consider the unsaturated aspect of track-bed materials when analysing the overall behaviour of tracks, in particular when clay is involved in fine fraction.

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Section: Mechanical Behavioursupporting

confidence: 82%

Unsaturated railway track-bed materials

Cui

2016

E3S Web Conf.

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“…Among the environmental factors affecting the permanent deformation of unbound layers of flexible pavements, many researchers found that the effect of water content is of great importance (Arnold and al. 2002;Werkmeister and al. 2003;Cracium 2009;Carrera and al.…”

Section: Introductionmentioning

confidence: 94%

Permanent Deformation of Various Unbound Aggregates Submitted to Seasonal Frost Conditions

Bilodeau¹,

Doré²,

Poupart³

2012

Cold Regions Engineering 2012

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Pavement performance in northern climate as encountered in Canada is significantly influenced by frost action. When it comes to granular materials used in flexible pavement foundations, few study focused on the effect of seasonal frost conditions on the mechanical properties of such materials, mostly because such materials are usually considered as non-sensitive to such environmental solicitation. As it is well known that seasonal frost conditions may cause an increase of water content as well as a loosening of granular assemblies, the effect of frost action on the long term performance, expressed as resistance to permanent deformation, of base granular materials was measured for various aggregate sources and two gradings through a comprehensive laboratory study based on cyclic triaxial testing. Five saturated samples were used as reference and 5 samples were tested following a freeze-thaw cycle. It was found that the freeze-thaw cycle has a more important effect than grading and that it mainly influences the samples post-compaction magnitude. Moreover, following a freeze-thaw cycle, the percentage of the final permanent deformation that is related to post-compaction usually increases, as the post-compaction model parameter was found to increase and as the permanent deformation rate model parameter was found to slightly decrease.

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“…The mechanical behaviour of ballast is very important to provide (predict) safety and economy of the rail track maintenance. Large-scale triaxial tests are usually curried out to study the mechanical behaviour of ballast under monotonic and repetitive loading [1][2][3][4][5]. These large-scale triaxial tests are very expensive.…”

Section: Introductionmentioning

confidence: 99%

Stress–dilatancy relationship for railway ballast

Dołżyk-Szypcio

2018

Studia Geotechnica Et Mechanica

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In the concept of the aesthetic formation of knowledge and its as soon as possible and success-oriented application, insights and profits without the reference to the arguments developed around 1900. The main investigation also includes the period between the entry into force and the presentation in its current version. Their function as part of the literary portrayal and narrative technique. Studies and InvestigationsThe main investigation also includes the period between the entry into force and the presentation in its current version. Their function as part of the literary portrayal and narrative technique.Abstract: Knowledge of the mechanical behaviour of ballast is very important for designing a railway track, especially for high-speed lines. The monotonic drained triaxial tests of scaled and fouled ballast presented in literature were analysed using the Frictional State Theory. The stress-plastic dilatancy relationship shows that four characteristic stages of shearing may be specified. The influence of stress level and water content may be quantified by the use of the Frictional State Theory. Abstract:In the concept of the aesthetic formation of knowledge and its as soon as possible and success-oriented application, insights and profits without the reference to the arguments developed around 1900. The main investigation also includes the period between the entry into force and the presentation in its current version. Their function as part of the literary portrayal and narrative technique. Studies and InvestigationsThe main investigation also includes the period between the entry into force and the presentation in its current version. Their function as part of the literary portrayal and narrative technique.

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Design of Granular Pavement Layers Considering Climatic Conditions

Cited by 27 publications

References 3 publications

Unsaturated railway track-bed materials

Unsaturated railway track-bed materials

Permanent Deformation of Various Unbound Aggregates Submitted to Seasonal Frost Conditions

Stress–dilatancy relationship for railway ballast

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