Summary

Abstract

The purpose of this session is to present research results whose primary concern is with the behaviour of subgrade soils under repeated loading in the context of the role they play in pavement design. The six papers assigned to this session contained three papers from the Science project and three from outside the Science project. The objective of the Science papers deal with: - Harmonization of a test procedure for triaxial testing of subgrade soils. - Prediction of subgrade moisture conditions for purposes of pavement design. - Resilient behaviour of soils. The three other papers, outside the Science programme, presented: - A study on the influence of the behaviour of a clay subgrade on the performance of a flexible pavement. (First paper - Nottingham University). - A study on the cyclic behaviour of l’ Ennerie sand, a material used as subgrade soil at the full-scale, pavement test facility of the Laboratoire Central des Ponts et Chaussées, in Nantes. (Second paper - LCPC, LRCP SaintBrieuc). - A study on the cyclic behaviour of in situ samples of various fine-grained subgrade soils. (Third paper - Swedish Road and Transport Research Institute).