This paper presents the results of laboratory investigations into the deformation of coal fouled ballast stabilized with geogrid at various degrees of fouling. A novel track process simulation apparatus was used to simulate realistic rail track conditions subjected to cyclic loading, and the void contamination index (VCI) was used to evaluate the level of ballast fouling. The experimental results show that coal fines act as a lubricant, causing grains of ballast to displace and rotate, and as a result, accelerate its deformation. However, coal fines also reduce ballast breakage because of a cushioning effect, that is, by reducing interparticle attrition. The inclusion of geogrid at the interface between the layer of ballast and subballast provides additional internal confinement and particle interlocking via geogrid apertures, which reduces deformation. A threshold value of VCI=40% is proposed to assist practitioners for conducting track maintenance. If the level of fouling exceeds this threshold,...

Deformation of coal fouled ballast stabilized with geogrid under cyclic load

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Frozen Ground Engineering

Effects of asphalt emulsion on properties of fresh cement emulsified asphalt mortar

Comparative study of two PCE superplasticizers with varied charge density in Portland cement and sulfoaluminate cement systems

Arching mechanism of the slab joints in CRTSII slab track under high temperature conditions

China railways track structure II (CRTS II) slab ballastless track on bridge is one kind of track structures unique to China. Its main bearing component of longitudinal force is the continuous base plate rather than rail. And the track-bridge interaction is weakened by the sliding layer installed between base plate and bridge deck. In order to study the dynamic response of CRTS II slab ballastless track on bridge under seismic action, a 3D nonlinear dynamic model for simply-supported bridges and CRTS II track was established, which considered structures such as steel rail, fasteners, track plate, mortar layer, base plate, sliding layer, bridge, consolidation, anchors, stoppers, etc. Then its force and deformation features under different intensities of seismic excitation were studied. As revealed, the seismic response of the system increases with the increase of seismic intensity. The peak stresses of rail, track plate and base plate all occur at the abutment or anchors. Both track plate and base plate are about to crack. Besides, the rapid relative displacement between base plate and bridge deck due to the small friction coefficient of sliding layer is beneficial to improve the seismic performance of the system. During the earthquake, a large vertical displacement appears in base plate which leads to frequent collisions between stoppers and base plate, as a result, stoppers may be damaged.

Xiaopei Cai

Papers

Arching mechanism of the slab joints in CRTSII slab track under high temperature conditions

Elastic-plastic seismic response of CRTS II slab ballastless track system on high-speed railway bridges

Study on the interlayer debonding and its effects on the mechanical properties of CRTS II slab track based on viscoelastic theory

Effects of comb-shaped superplasticizers with different charge characteristics on the microstructure and properties of fresh cement pastes

Influences of triethanolamine on the performance of cement pastes used in slab track