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The present paper results from the study of the influence of post-compaction moisture variation and suction on shear strength of four distinct soils used in road construction in the state of Rio Grande do Sul, Brazil. The methodology consisted in obtaining the soil-water characteristic curves and failure envelopes of the soils, followed by mechanistic analysis performed with the AEMC/SisPav tool. It was verified that suction directly influences the maximum shear stresses and that the shear stresses acting on subgrades of flexible and thin pavements are quite lower than the limits imposed by the envelopes. This eliminates the possibility of shear failure, although excessive plastic deformation might still take place.
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