Abstract: The progressive deformation at the crest of highway cut slopes can provide firsthand information on the entire stability and deformation of the cut slopes; therefore, it has a practical meaning to study the deformation at the crest. Based on the numerical analysis results and the monitored data, this paper presents a case history of the progressive deformation at the crest of a cut slope in Bid Package A3 (ZK14+165) of Zhaoyin Highway Project in Zhangzhou. The results have the following conclusions: 1) Except for the unloading deformation on the newly excavated benches, the deformation zone at the crest has the predominant displacements; 2) The deformation increase with the depth of the cut and the largest deformation is close to the slope; 3) For a cut depth of 38.8 meters slope, the deformation occurs within a 10meter horizontal zone to the edge and a spiral deformation curve can be found from the crest to the toe of the slope.

Key words: Cut Slopes, Deformations, Slope Crests