Experimental Study on the Cyclic Resistance of a Natural Loess from Northern France

Karam, Jean-Paul; Cui, Yu‐Jun; Tang, Anh Minh; Terpereau, Jean-Marc; Marchadier, Gilles

doi:10.3208/sandf.49.421

Cited by 21 publications

(3 citation statements)

References 38 publications

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“…In this area, loess deposits were formed under periglacial conditions during the Quaternary period by the aeolian transport of silt particles eroded by a constant North West wind (Antoine 2002(Antoine , 2003, resulting in loess deposits characterized by a relative homogeneity, a low plasticity, a high porosity and a loose microstructure. These features explain the loess susceptibility to collapse when exposed to intense rainfall or accidental water leaking (Cui et al 2004, Delage et al, 2005, Yang et al, 2008, Munoz-Castelblanco et al 2011 as well as its liquefaction behaviour under cyclic loading (Karam et al 2009).…”

Section: Tested Loessmentioning

confidence: 99%

On-sample water content measurement for a complete local monitoring in triaxial testing of unsaturated soils

Muñoz-Castelblanco¹,

Delage²,

Pereira³

et al. 2012

Géotechnique

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International audienceTo provide a complete local monitoring of the state of an unsaturated soil sample during triaxial testing, a local water content measurement device was adapted to a triaxial device comprising the measurement of local displacements (Hall effect transducers) and suction (high-capacity transducer). Water content was locally monitored by means of a resistivity probe. The water content/resistivity calibration curves of an intact, natural, unsaturated loess from northern France extracted by block sampling at two depths (1 and 3.3 m) were carefully determined, showing good accuracy and repeatability. The validity of two models giving the resistivity of unsaturated soils with respect to their water content was examined. The first triaxial tests carried out with this device in the range of in situ stresses gave satisfactory results, but with some effects of the applied cell stress on the water content measurements. Some preliminary behaviour characteristics of the natural unsaturated loess, a material rarely tested up to now in the literature, were evidenced. Also, the yield stresses appeared significantly higher than the in situ stresses, confirming the combined effect of partial saturation and bonding

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Section: Tested Loessmentioning

confidence: 99%

On-sample water content measurement for a complete local monitoring in triaxial testing of unsaturated soils

Muñoz-Castelblanco¹,

Delage²,

Pereira³

et al. 2012

Géotechnique

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“…Indeed, in the case of northern line (Paris-Lille), a sub-grade of loess is involved. Under the effects of rainfall and dynamic loading, track instability problems were identified, leading to an extensive study to identify the main instability mechanisms (collapse upon wetting, cementation degradation upon cyclic loading and liquefaction in the saturated sate) and to find out an appropriate reinforcement technique such as grouting (Cui et al, 2007;Yang et al, 2008;Karam et al, 2009;Munoz-Castelblanco et al, 2011;2012a;2012b). In the case of Mediterranean Line (Paris-Marseille), a sub-grade of marl was encountered and its swelling due to the coupled effect of water infiltration and excavation-related unloading was revealed to be one of the main mechanisms for the significant track heave identified (Tang et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the hydro-mechanical behaviour of fouled ballast

Cui

Duong

Tang

et al. 2013

J. Zhejiang Univ. Sci. A

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“…Indeed, in the case of northern line (ParisLille), a subgrade of loess is involved. Under the effects of rainfall and dynamic loading, track instability problems were identified, leading to an extensive study to identify the main instability mechanisms (collapse upon wetting, fatigue under large number of loading cycles and liquefaction in the saturated sate) [1][2][3][4][5][6]. In the case of Mediterranean Line (Paris -Marseille), a subgrade of marl was encountered and its swelling due to the coupled effect of water infiltration and excavation-related unloading was revealed to be one of the main mechanisms for the significant track heave identified [7].…”

Section: Introductionmentioning

confidence: 99%

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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Experimental Study on the Cyclic Resistance of a Natural Loess from Northern France

Cited by 21 publications

References 38 publications

On-sample water content measurement for a complete local monitoring in triaxial testing of unsaturated soils

On-sample water content measurement for a complete local monitoring in triaxial testing of unsaturated soils

Investigation of the hydro-mechanical behaviour of fouled ballast

Unsaturated railway track-bed materials

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