3. Classification of fill and subgrade materials
In the previous dossier, we described "Properties of natural materials", the various parameters that characterize materials. The GTR classification is based on three types of parameters: nature, condition and mechanical behavior. It focuses on conditions for reuse as fill or subgrade. It should be noted, however, that it does not take into account all aspects of the earthworks execution phase, in particular any extraction difficulties.
3.1 Classification of materials by type
The classification of materials by type is summarized below (figure 1). It is divided into three categories: soils, rocky materials and special materials.
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Classification of fill and subgrade materials
Conditions for using materials as backfill
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