Characterization of permanent deformation of subgrade soils using cyclic loading test

Abstract EN

Permanent deformation of subgrade soils is the accumulation of plastic deformation in soils due to continuous repeated loads from traffic loading.

The main objective of this study is to investigate some of the factors that affect the permanent deformation of subgrade soils such as soil types, compaction moisture content, applied stress and dry density.

Also, to formulate regression models which have been obtained to predict the permanent strain in subgrade soils as related to moisture content , time of loading, dry density and applied stress by using STATISTICA software.

This research also established a test procedure to use cyclic load test to measure the permanent strain of subgrade soils.

The permanent strains were monitored during 60 load cycles, and the accumulated permanent deformations were determined.

The test procedure and test results conducted on two types of soils that cover an important geographical area of Iraq, A4 and A6 soils are presented.