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2. Innovative contributions of the GTR guide
The guide incorporates experience gained on site and advances in construction techniques.
2.1 Material classification
For reference purposes, we list below the main improvements made by the GTR compared with the former RTR recommendation of 1976:
the clear distinction between loose soil and rocky terrain;
extension and clarification of the classification of category F materials: organic soils and industrial by-products;
taking into account the nature of the matrix (the fine clay or sand fraction) of coarse soils;
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the use of new, more significant parameters (see definitions in ) to assess the suitability...
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Innovative contributions of the GTR guide
Classification of fill and subgrade materials
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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