Abstract: This paper presents the case history of an expressway high embankment settlement mitigation by the steel perforated pipe grouting method. The grouting results are numerically simulated by MIDAS GTS commercial software under three different conditions: namely, only considering the effect of steel pipe, only considering the effect of grouting, and considering the combinations steel pipe and grouting. The results show that: the reinforcement effect of grouting steel perforated pipe on the embankment is composed of steel pipe and grouting soil, and the effect of the two components on the controlling embankment settlement are similar. In addition, the steel perforated pipe mainly plays the role of the soil nail, and its effect decreases with the improvement of grouting effect.

Key words: Subgrade Engineering, High Embankment, Steel Perforated Pipe, Grouting Reinforcement, Rehabilitation Design