Effect of swelling of subgrade soil on the flexible pavement

摘要

To investigate the effect of swelling pressure on road pavement, two different apparatusrn(Oedometer cell and CBR mold) were adopted to predict directly swelling percent and swelling pressure ofrnsub grade soil under pavement at different moisture contents. CBR tests were carried out to investigate thernstrength of soaked subgrade soil. The effect of subgrade moisture contents on soil strength, and swelling pressurernwere investigated for soaked samples. Flexible pavement was design to resist swelling pressure predictedrnfrom the subgrade soil. The results show that a significant increase in pavement thickness to resist swellingrnpressure for lower moisture content than that design based on CBR curves only.