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J. Pistrol, T. Hofbauer, F. Kopf, B. Antony, F. Auer, D. Adam:
"Subballast compaction in track rehabilitation by means of plate compactors";
Vortrag: 20th International Conference on Soil Mechanics and Geotechnical Engineering, Sydney; 02.05.2022 - 05.05.2022; in: "Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering", (2022), Paper-Nr. 2915, 6 S.

In the course of track maintenance, formation rehabilitation machines like Plasser & Theurer´s AHM 800-R are widely
used for the renewal of the formation protective layer (FPL). Two excavating chains remove the existing ballast and FPL. Using
integrated ballast washing plants, crushing plants and mixers, large quantities of the old ballast can be reconditioned and used for the
FPL, which is automatically filled and compacted by a set of six plate compactors. The final FPL usually has a thickness of 40 cm,
which results in a challenge for the plate compactors since the compactors are limited in size and weight to be able to operate below
the raised track grid. The ability of the plate compactors to sufficiently compact the FPL is investigated by means of a mechanical
model describing the interaction of the compactor with the soil. Three operating phases - loading, unloading and loss of contact -
characterize the interaction and are simulated for numerous parameter combinations of compactor and soil characteristics. The
motion quantities obtained from the model are evaluated and discussed. The results of modeling show that an increase of the FPL
stiffness is accompanied by a significant change of the motion behavior.

Soil dynamics, track rehabilitation, railway engineering