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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...
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Classification of fill and subgrade materials
Conditions for using materials as backfill
Bibliography
References
Calculation software
ALIZÉ – LCPC: software overview http//www.lcpc.fr/fr/produits/alize/doc/alize.pdf
Standardization
- Earthworks – Classification of materials for use in the construction of road infrastructure embankments and subgrades Classification number : P11-300 - NF P11-300 - 09-92
- Earthworks – Terminology Classification number : P11-301 - NF P11-301 - 12-94
- Soils: reconnaissance and testing – Platform load-bearing capacity – Part 1: Modulus under static plate loading (EV2) - NF P94-117-1 - 04-00
- Soils: reconnaissance...
Platform bearing capacity tests
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Module under static loading EV2
The test is defined by standard NF P94-117-1 published in April 2000 (see § Standardization in this "To find out more" section).
It involves two static loadings on a rigid 60 mm diameter plate. The EV2 modulus is determined using Boussinesq's formula:
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