With the building of expressways

the problem of soft ground is becoming more and more protrusive and has been one of key factors influencing project quality

project cycle and project cost. So it has become a very important task to strengthen the research on the improvement of expressway soft ground

which affects the development of traffic project in China. In light of the randomness and uncertainty of these effective factors

a new decision model of the soft ground improvement of the highway using case-based reasoning is presented. Examples show that the model is effective

and the principle of the model is simple

visual and convenient to use.