The adoption of mechanistic concepts in pavement design offers the opportunity of analysing unbound granular base (UGB) materials in the framework of soil mechanics by incorporating the recent advances in technology. In the past, the influence of fines content on the deformation behaviour of UGB is generally carried out by uni-axial cyclic loading. However, cyclic loading from moving traffic will also induce cyclic lateral stress. Recent advances in triaxial testing facility made it possible to impose cyclic loading in both axial and radial direction. This study mainly focuses on the influence of fines content on deformation behaviour of UGB behaviour under cyclic axial and radial stress. The framework of unsaturated soil mechanics is applied to analyse the test result. The test results showed that matric suction can capture the influence of fines at early stage of cyclic loading.
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