Application of polyurethane geocomposites to help maintain track geometry for high-speed ballasted railway tracks

Woodward, Peter Keith; Kacimi, A. El; Laghrouche, Omar; Medero, Gabriela M.; Banimahd, Meysam

doi:10.1631/jzus.a12isgt3

Cited by 55 publications

(17 citation statements)

References 30 publications

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“…Kennedy and Woodward et al [6,7] conducted the fatigue tests of railway ballast reinforced with high polymer, the results turn out that the subsidence of railway roadbed is reduced obviously. Erdemgil et al [8] found that the injected high polymer expanded drastically in the foundation, this reduces the voids of the soil and supports the loading with the soil, which increases the bearing capacity of the foundation.…”

Section: Applications Of High Polymer Groutingmentioning

confidence: 99%

Application of polymer grouting reinforcement technology in the treatment of slope collapse

Zhang¹,

Liu²,

Ye³

2016

Proceedings of the 2016 5th International Conference on Environment, Materials, Chemistry and Power Electronics

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Abstract. Taking into considering of the difficulties and urgency in the treatment of geological hazards such as slope collapse, in light of the deficiencies in previous treatment methods, and also in view that the high polymer material, which has been widely used in geotechnical engineering, possesses the merits of high strength, light weight, high expansibility, short setting time, good durability, easy construction and is water-proof and harmless to the existing structures, the polymer grouting for the treatment of slope collapse is put forward innovatively. It is found that the polymer grouting can handle all kinds of unfavorable conditions in the treatment of slope collapse well. The slope deformation and stability before and after reinforcement with polymer grouting were studied by finite element method. The results indicates that the polymer grouting can deepen the slip circle and increase the sliding path, as a result, it avoids the shallow sliding mode of slope, which leads to the increase of stability and the decrease of slope deformation. After reinforcement, the factor of safety is increased by 35% and the maximum total displacement is reduced by 34.5%. Hence, the effectiveness of polymer grouting reinforcement technology is preliminarily verified.

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Section: Applications Of High Polymer Groutingmentioning

confidence: 99%

Application of polymer grouting reinforcement technology in the treatment of slope collapse

Zhang¹,

Liu²,

Ye³

2016

Proceedings of the 2016 5th International Conference on Environment, Materials, Chemistry and Power Electronics

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“…In order to improve the quality of ballast structure, the addition of other materials to ballast layer can be considered as a solution. Woodward et al [8], through their studies, had applied a unique material named in-situ polyurethane polymer to increase the stability of ballast structure. However, its usage needs to be considered due to its availability in rail industry.…”

Section: Introductionmentioning

confidence: 99%

Utilization of 60/70 penetration grade asphalt on ballast structures with the variation of percentage and the number of pouring layers

Setiawan

2019

Journal of the Mechanical Behavior of Materials

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Railroad ballast structure layer may experience a decline in mechanical and geometrical performance due to heavy train and environmental loads. In order to improve the quality of ballast structure, the addition of asphalt to ballast layer can be considered as a solution. Therefore, this research utilizes 60/70 penetration grade asphalt for ballast layer binding and stabilization. The objective of this study was to evaluate and analyze the mechanical behavior of clean-ballast and fouled-ballast layers with 2% and 4% penetration grade 60/70 asphalt poured in one (ballast surface layer) and three ballast surface layers. Compressive strength test was performed to analyze the weight of specimen, vertical deformation, and ballast material abrasion. The most prominent finding to emerge from this research was that the use of 60/70 penetration grade asphalt on ballast surface layer is crucial in retaining the load applied by UTM, in order to produce preferable load distribution to the entire ballast structure. It is found that, the higher the 60/70 penetration grade asphalt proportion and the more layers poured with asphalt, the stronger asphalt in reducing ballast abrasion percentage.

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“…However, this type of track structure has some drawbacks such as instability in the lateral direction, easy dirt accumulation, high settlement, and maintenance frequency (Esveld, 2001; Lim, 2004). In order to address some of the drawbacks, Woodward et al (2007; 2012a, 2012b) proposed the Xi-TRACK technique to bond the ballast particles on the surface of the ballast bed, integrating the ballast particles into a whole body structure in order to reduce the deterioration and deformation of the ballast bed and to prolong the service life of the track system. In this technique, polyurethane foam is injected into the clean ballast bed using a pressure foaming machine (Keene et al, 2012, 2013).…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of a polyurethane foam solidified ballasted track in a heavy haul railway tunnel

Cai

Zhong

Hao

et al. 2018

Advances in Structural Engineering

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Dynamic behavior of a new type of track using the polyurethane foam solidified ballast in heavy haul railway tunnels is comprehensively investigated in this study. First, a dynamic model of the vehicle-track-tunnel interaction system was developed based on the multibody system dynamics theory and finite element method. Then, the dynamic effects of the polyurethane foam solidified ballast track on the train and the surrounding infrastructures were calculated and compared to those of the traditional ballasted track. Moreover, the effects of the elastic modulus and the solidified area size of polyurethane foam solidified ballast on the dynamic behavior were analyzed. Results show that, compared to the traditional ballast bed, polyurethane foam solidified ballast decreases the track stiffness and the vibration acceleration of the tunnel, while does not affect the vehicle safety (derailment coefficient and the rate of wheel load reduction). A larger elastic modulus of polyurethane foam solidified ballast has little effects on the wheel-rail interaction and the vibration acceleration of the tunnel, while a smaller modulus results in amplification of the displacements of rails and sleepers. Considering the vehicle-track interaction and tunnel vibration, the optimal elastic modulus of polyurethane foam solidified ballast is suggested to be 60-80 MPa. In addition, smaller solidified area of polyurethane foam solidified ballast presents lower effects on the vibration reduction and rate of wheel load reduction, while larger area leads to a higher derailment coefficient and cost. Therefore, an optimal solidified area size of polyurethane foam solidified ballast with the top width of 0.85 m is recommended.

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Application of polyurethane geocomposites to help maintain track geometry for high-speed ballasted railway tracks

Cited by 55 publications

References 30 publications

Application of polymer grouting reinforcement technology in the treatment of slope collapse

Application of polymer grouting reinforcement technology in the treatment of slope collapse

Utilization of 60/70 penetration grade asphalt on ballast structures with the variation of percentage and the number of pouring layers

Dynamic behavior of a polyurethane foam solidified ballasted track in a heavy haul railway tunnel

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