Ballast degradation under different cycles and rotational speeds in micro-Deval equipment
Ballast degradation under different cycles and rotational speeds in micro-Deval equipment
The ballast layer plays a crucial part in transmitting and distributing the wheel load from sleepers to the underlying sub-ballast and subgrade at a reduced and acceptable level. Upon repeated train loading, ballast becomes degraded. The amount of degraded ballast is directly connected with the load and velocity of the train, and the type of rock. This paper shows the results of 14 Ballast Degradation in micro-Deval equipment (BDMD) tests carried out at different rotation velocities (13, 25, 50, 63, 75, 100 y 120 rpm) and at different number of cycles (0, 1000, 3000, 6000, 9000, 15000, 21000, 69000 y 105000) with samples of two types of railway ballast. The first is gneiss ballast, one of the most common in the High-speed Spanish railways, and the second one is a limestone ballast, forbidden in Spain. For each one of the mentioned cycles, a grain size distribution test is performed. The main objective of this paper is to analyse the influence of the rotational speed and the number of applied cycles on the degradation of the ballast.
N. S. Montero-Cubillo; J. Estaire; E. Marull
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
E - Environment, water and energy
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