Stress distribution from railway track over geogrid reinforced ballast underlain by clay

Fattah, Mohammed Y.; Mahmood, Mahmood R.; Aswad, Mohammed F.

doi:10.1007/s11803-019-0491-z

Cited by 34 publications

(15 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Fattah et al ( 2019) [15] showed that the presence of one or more layers of geogrid at the bottom of the base allows for the shear interaction between the aggregate and the geogrid, as the base attempted to spread laterally. Shear load was transmitted from the base aggregate to the geogrid and placed the geogrid in tension.…”

Section: Stress Results For Reinforced Modelsmentioning

confidence: 99%

Function and Application of Geogrid in Flexible Pavement under Dynamic Load

Jebur¹,

Fattah²,

Abduljabbar³

2021

ETJ

View full text Add to dashboard Cite

Section: Stress Results For Reinforced Modelsmentioning

confidence: 99%

Function and Application of Geogrid in Flexible Pavement under Dynamic Load

Jebur¹,

Fattah²,

Abduljabbar³

2021

ETJ

View full text Add to dashboard Cite

“…Te average maximum vertical stress for the 200 MPa subgrade is 33 kPa for a 100 km/hr rail speed. However, increasing the load cycle with time may increase the stress because, with time, the particle interlocking of the ballast will increase, and it will transmit more load to the subgrade [63].…”

Section: Efect Of Subgrade Stifness On Vertical Stressmentioning

confidence: 99%

Response Analysis of a Ballasted Rail Track Constructed on Soft Soil by 3D Modeling

Hoque

Aziz

Mallick

et al. 2023

Advances in Civil Engineering

View full text Add to dashboard Cite

The displacement, stress, and strain distributions of railway embankments on the soft deltaic deposit of the Ganges–Brahmaputra floodplain are investigated. A numerical model developed in general-purpose finite element software is used to simulate the design train load on a deltaic deposit for a 100 km/hr rail speed. The numerical analysis analogy is grounded in the spring model, where a beam under the unit load is modeled based on the Winkler foundation model concept. In the moving load simulation on soil, the static point load relating to the axle load is assigned in the form of a dynamic multiplier, determined using auxiliary software. The calculated shear force in terms of the influence line is applied as a dynamic multiplier. The numerical results demonstrate that under a dynamic train load, the loose ballast undergoes larger and more erratic displacement than the subballast. Comparative analysis between varying subballast stiffnesses shows that stiffer subballast yields smaller displacements. Moreover, a high subballast stiffness can counterbalance the potential of forming permanent deformation by generating lower strains. However, a stiffer subballast does not play a prominent role in reducing the displacement of ballast or vertical stresses. The subgrade is found to carry the maximum load, withstanding the maximum vertical stress; thus, the importance of using an improved subgrade with higher stiffness is also observed. A greater subgrade stiffness improves its load-carrying capacity but fails to reduce the tension responsible for the lateral spreading of the soft subsoil. To reduce the high radial strain, the effects of improving the stiffness properties of two immediately adjacent soft soil layers are numerically investigated. The improvement of subsoil alone is effective in reducing the radial strain, whereas the improvement of both subgrade and subsoil produces further reductions. The critical train speed generating the maximum displacement is identified as 120 km/hr, and the dynamic velocity amplitude decreases with depth. Finally, an allowable limit of rail embankment settlement on a soft deltaic deposit is observed.

show abstract

“…ey showed that by an increase of the amplitude load and the load frequency, consequently, the settlement of the subgrade layer settlement is decreased. Other studies also indicated that geogrid reinforcement improves the railway track by reducing the dynamic frequency response and settlement [46,47]. Fattah et al [48] also focused on investigating the stress distribution from railway track over geogrid reinforced ballast underlain by clay.…”

Section: Literature Reviewmentioning

confidence: 99%

Modeling Dynamic Frequency Response on Slab Track of Shinkansen Railway Based on Finite Element Method

Gholizadeh

Aghayan

Hadadi

2022

Advances in Civil Engineering

View full text Add to dashboard Cite

The use of slab tracks in lieu of ballast tracks has introduced new dimensions in track dynamics in high-speed railways. To improve the performance of slab tracks under dynamic frequency responses caused by loads on the Shinkansen railway, the present study aimed to investigate the effect of mechanical properties of track components, including the elasticity modulus and thickness on the resonance frequency of the vertical dynamic responses using the finite element method. Such responses included receptance and decay rate in the asphalt bearing layer (ABL), hydraulically bonded layer (HBL), and concrete bearing layer (CBL). In addition, the study sought to select the optimal layer as an effective layer in the view of reducing the resonance frequency of dynamic responses in comparison with the general model. Based on the data regarding the effects of elasticity modulus and thickness of slab track layers on the resonance of the dynamic frequency responses under the amplitude loads, by changing the load from 20 to 25 tons over the slab track, the receptance under the modulus and thickness change increased up to 34 and 29%. Moreover, the decay rate under the modulus and thickness change increased up to 31 and 37%. Accordingly, by increasing the load amplitude, the CBL and HBL showed lower dynamic responses than other layers. Thus, CBL and HBL were selected as the optimum layers for improving the performance of the slab track of the Shinkansen railway.

show abstract

Stress distribution from railway track over geogrid reinforced ballast underlain by clay

Cited by 34 publications

References 8 publications

Function and Application of Geogrid in Flexible Pavement under Dynamic Load

Function and Application of Geogrid in Flexible Pavement under Dynamic Load

Response Analysis of a Ballasted Rail Track Constructed on Soft Soil by 3D Modeling

Modeling Dynamic Frequency Response on Slab Track of Shinkansen Railway Based on Finite Element Method

Contact Info

Product

Resources

About