Investigation of the hydro-mechanical behaviour of fouled ballast

Cui, Yu Jun; Duong, Trong Vinh; Tang, Anh Minh; Dupla, Jean Claude; Calon, Nicolas; Robinet, Alain

doi:10.1631/jzus.a1200337

Cited by 57 publications

(20 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The tap water kept flowing into the column from the bottom and discharging from the hole on the cap of the column. This procedure lasted for at least 24 h in order to achieve moisture homogenization (Cui et al, 2013). The porosity of the specimen is 0.39.…”

Section: Materials and Preparationmentioning

confidence: 99%

A column system for modeling bentonite slurry infiltration in sands

Yin

Chen

et al. 2016

J. Zhejiang Univ. Sci. A

View full text Add to dashboard Cite

Abstract:Pressurized bentonite slurry is applied on a tunnel face to form a filter cake to stabilize the tunnel face when the slurry shield excavates through the sandy soil. Failure of the tunnel face may be caused by a high permeable filter cake, which commonly has a long penetration distance of slurry in sands. A column system with a height of 680 mm and a diameter of 300 mm was developed to model pressurized slurry infiltration in sands. Pressure transducers were installed to estimate the hydraulic conductivity of the filter cake during slurry infiltration. The electrical conductivity of the leachate of collected samples was measured. Results show that the majority of fine particles in slurry are within the range 100-300 mm into the sand specimen. The time for forming an impermeable filter cake is about 300 s, which indicates the impermeable filter cake is hard to form during the excavation.

show abstract

Section: Materials and Preparationmentioning

confidence: 99%

A column system for modeling bentonite slurry infiltration in sands

Yin

Chen

et al. 2016

J. Zhejiang Univ. Sci. A

View full text Add to dashboard Cite

show abstract

“…Emphasis was put on the effects of water content and fines content on the resilient modulus and permanent deformation [30]. Based on the experimental results, a constitutive model was developed, taking into account both the effect of stress level and the effect of degree of saturation [9]. Figure 10 presents typical curves of deviator stress versus axial strain for the first cycles in a test on the interlayer soil with addition of 5% subgrade soil and at 6% water content -ITL5w6 [31].…”

Section: Mechanical Behaviourmentioning

confidence: 99%

“…The results obtained in this study on the interlayer soil are in agreement with these works. To extend the model of Gidel et al [37] to the effect of water content or degree of saturation, a function relating the permanent axial strain to the water content and the applied deviator stress, t(w, q max ), was defined, as follows [29,9]:…”

Section: Mechanical Behaviourmentioning

confidence: 99%

“…This is why it has been decided to keep this layer in the French program of conventional track renewal. Note that this track renewal program is important because it almost involves the whole French network: the conventional lines represent 94% of the whole network of about 30 000 km [9]. Figure 2 shows a picture of soil profile taken when during sampling at the site of Sénissiat, France, after removing the ballast layer.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unsaturated railway track-bed materials

Cui

2016

E3S Web Conf.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…In the French program of conventional railway lines renewal, this interlayer with a dry unit mass as high as 2.4 Mg/m 3 (Trinh 2011) was maintained due to its favorable mechanical behavior. Thus, a series of studies have been conducted, especially on the upper part of the interlayer, aiming to clarify the effect of fines and water contents on the mechanical behavior by both monotonic and cyclic triaxial tests (Trinh et al 2012;Cui et al 2013;Duong et al 2013;Duong et al 2016;Lamas-Lopez 2016). The results showed that the increase of water content decreased the shear strength and enlarged the permanent deformation.…”

Section: Introductionmentioning

confidence: 99%

Influence of grain size distribution of inclusions on the mechanical behaviours of track-bed materials

Cui

Chen

et al. 2020

Géotechnique

Self Cite

View full text Add to dashboard Cite

In French conventional railway track-bed, an interlayer was created, mainly from the interpenetration of ballast and subgrade. Field investigation showed that the ballast content decreases over depth. In addition, depending on the locations, the grain size distribution of ballast grains can be quite different, defining different values of coefficient of uniformity, Cu. In this study, triaxial tests were carried out on the interlayer soil with three Cu values and five volumetric inclusion contents, fv. X-ray micro computed tomography scans were also conducted on representative samples to visualise the corresponding inclusion distributions. Results show that: (a) at all three Cu values, two soil fabrics can be identified, namely grain–grain contact structure for large inclusion contents (fv = 35% and 45%) and fine–fine contact structure for small inclusion contents (fv = 5%, 10% and 20%), and the characteristic volumetric inclusion content fv-cha separating these two categories was larger for smaller Cu since in this case fewer inclusion contacts were expected to be developed at a given fv; (b) for the grain–grain contact structure, a smaller Cu caused larger maximum deviator stress qmax, larger friction angle, larger Poisson ratio and more dilatancy due to the involvement of more large grains at smaller Cu; (c) for the fine–fine contact structure, an opposite trend was observed: the smaller the Cu, the smaller the qmax, the friction angle, the Poisson ratio and the dilatancy owing to a smaller quantity of inclusion grains; (d) the change patterns of Young's modulus and cohesion with increasing Cu were the same for the two soil fabrics – Young's modulus and cohesion decreased with the increase of Cu.

show abstract

Investigation of the hydro-mechanical behaviour of fouled ballast

Abstract: International audienc

Cited by 57 publications

References 39 publications

A column system for modeling bentonite slurry infiltration in sands

A column system for modeling bentonite slurry infiltration in sands

Unsaturated railway track-bed materials

Influence of grain size distribution of inclusions on the mechanical behaviours of track-bed materials

Contact Info

Product

Resources

About