Trackbed settlement and associated ballast degradation due to repeated train moving loads
نویسندگان
چکیده
With increasing train speed and wheel axle load, severe vibrations can occur in a ballasted trackbed, thereby accelerating the degradation of ballast particles ultimately causing excessive settlement. To gain insights into long-term trackbed behavior evolution, full-scale track experiment with eight sleepers was designed tested on validated physical model test platform (ZJU-iHSRT). Sieving analysis together computer-aided morphology were adopted to quantify terms both particle size morphological after every 100,000 carriages. Various sensors installed at key locations record dynamic stress responses, vibration velocities deformations under moving loads for up 500,000 carriages total. The movements individual inside layer also captured using “SmartRock” wireless sensors. soil stresses all peaked underneath rail seat decayed distance away from seat. Severe occurred sizes properties, middle zone sleeper suffering greater breakage due stronger confinement. densified layer, through rearrangement filling voids bed, resulting reduction vibrations. amplitudes vertical around reduced by over 25% 38% respectively loading shape became more compact test, larger diameter Platy, Bladed Elongate shapes found be likely degrade. Over 50% permanent settlement resulted deformation, increase intensified lateral longitudinal directions accelerated development accumulated settlement, while load caused index (BBI) rise dramatically contributed significantly
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ژورنال
عنوان ژورنال: Soil Dynamics and Earthquake Engineering
سال: 2022
ISSN: ['1879-341X', '0267-7261']
DOI: https://doi.org/10.1016/j.soildyn.2021.107109