Abstract: During the operation of an expressway in East China, several sections of highway slides are observed at embankments after the typhoon induced rainfall. Through comprehensive evaluation on the engineering geological characteristics of the embankment area, the deformation characteristics of the embankment slide, and the development of cracks, the causes of the embankment sliding hazards in this section are analyzed. By using the Geo-Slope commercial software to evaluate the stability of the embankment in this section and combining with the basic data of geological exploration and design, the shear strength parameters of the bedrock and soil are obtained. Based on the emergency mitigation requirement of rescue and hazard relief, after the stability evaluation to meet the relevant code requirements, a comprehensive mitigation plan of “two-level flat platform back pressure at the foot of the slope + optimization of embankment drainage + strengthening of pavement structure” was finally adopted. After the continuous follow-up and on-site investigation, it was found that the road has been operating safely for nearly four (4) years after the hazard treatment, and the overall stability of the embankment is satisfactory. Similar engineering projects can refer to the treatment for embankment hazards.

Key words: Highway Embankment, Rainfall Infiltration, Landslide Mitigation, Mechanism Analysis, Stability Analysis