Keywords: fouling index, compaction, dynamic cone resistance, ballasted layer.

This work presents the results of tests carried out as part of the study of the influence of ballast fouling materials and compaction states on the dynamic cone resistance. It is a complement for a previous study on the statistical analysis of the influence of ballast fouling on penetrometer and geoendoscope data [1]. As a result of this previous work, a particular behaviour of the average cone resistance was highlighted. The cone resistance (qd) initially increases with Fouling Index, highlighting the mechanical resistance to penetration improvement of the ballasted layer. Then, when the ballast is fouled, this mechanical resistance decreases. However, the tests cases This behaviour was highlighted for specimens without compaction differences. The present study exposes results obtained from similar test specimens compacted in two new distinct sates. For the same range of Fouling Index (FI), this study confirms the previously highlighted behavior for more compacted test cases with only sandy fouling material.

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