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6. Classification and sizing of platforms
The design of subgrades is based, on the one hand, on the assessment of numerous parameters (intrinsic and/or mechanical characteristics of materials, frost susceptibility, etc.) and, on the other hand, calls on complementary disciplines, in particular those concerning traffic studies and pavement design proper, which are not developed here.
This paragraph only outlines the different classes of platform in natural and treated materials.
6.1 PST and earthworks
PST is differentiated into 7 cases, in cut or fill, listed in table 8 taken from fascicule 1 of the GTR. PST cases are defined in qualitative terms and related to groups of material classes and...
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Classification and sizing of platforms
Backfill and subgrade compaction
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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