Based on the engineering case and the numerical modeling

in the expressway widening engineering

the effect mechanism and factors of the soft soil properties improvement induced by the old embankment load on the settlement of the embankment are analyzed.The results show that the settlements of both the new and old embankments are influenced by the soft soil properties improvement

besides

the soft soil properties improvement changes the additional stress distribution in the old road foundation induced by the new embankment load

which also influences the settlement of old embankment.The traditional calculation method can′t consider the effect of the additional stress distribution′s change on the settlement.Comparing considering the effect of the old embankment load and not

the settlements of the new embankment are different

and the settlement difference increases with the increasing of embankment height

new embankment width and soft soil ground thickness

while the settlement difference of old embankment is influenced only by soft soil ground thickness.