Train Moving Load‐Induced Vertical Superimposed Stress at Ballasted Railway Tracks

Abstract

Ballasted railway track is an important factor that forms railway transportation over the world, which may face severe damage during operation due to the deterioration of the track ballast geometry. A practical method of evaluating train moving load-induced vertical superimposed stress in substructure by incorporating the effects of ballast characteristics and multilayered substructure is presented. The proposed method is validated by comparing with the field measurements compiled from the literature with the calculated value. It is found that the prediction accuracy of the proposed method is within ±10%, in comparison with field measurements. Meanwhile, it should be emphasized that the predicted value by traditional methods was 1.4–5.0 times field measurements. Also, key factors affecting the predicted accuracy are identified through parameter analysis by using the proposed and the traditional methods.

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

“…However, one important observation is that the stresses in the subgrade are much higher than those in the ballast and subballast layers. Te thickness of diferent layers of the railway track is an important factor that afects the vertical stress distribution [60]. Tus, a subgrade with a thickness greater than those of the ballast and subballast has a variation in stress that is diferent than those of the other two layers.…”

Assessment technologies of rail systems’ structural adequacy — A review from mechanical engineering perspectives

“…[35][36][37][38][39] The bearing potential of tracks and track subsystems has been calculated in numerous studies. [40][41][42][43][44] Typical rail defects are rail corrugation of short and long wavelengths, dipped welds and joints, pitting, and shelling, which can be identified based on the shape of dynamic load signals from the monitoring data. Based on force evaluation, essential to monitor realtime rail defects because the high impact loading caused by these anomalies will reduce the safety levels of a railway track; therefore, capacity is unexpectedly reduced by thermal effects and the occurrence of severe events.…”

Observed Performance of Highway Embankment over Soft Marine Clay: A Case Study in Wenzhou, China

“…When highway embankments are constructed on alluvial deposits, the soft soils often bear intolerably large settlements or fail due to insufficient bearing capacity. erefore, a variety of methods have been used to solve these problems [14][15][16][17][18]. Such reinforcement methods include jet grouting [2,[18][19][20], deep mixing [21][22][23], and stiffening method [24,25].…”