Abstract: Construction induced hazards, such as, cracks on the highway pavements and retaining walls and structure misalignment have frequently occurred in the half cut and half fill highway subgrades. This paper presents some case histories in the construction of half cut and half fill highway subgrades in E’Xi mountain area. Throughout the evaluation and analysis of site investigation data in the design phase as well as construction surveying and monitoring data, the factors that attribute to the construction induced hazards are presented. The results indicate that these hazards are the results of the deep-seated slides underneath the highway embankment. This composite soil and rock sliding plane consists of original fill embankment, backfill soil at the toe of the slope and in the karst rock cavity, and the daylighting rock slope. The evaluation and the mitigation of the highway embankment construction induced hazards provide the useful case histories for the similar design and construction.

Key words: Half Cut and Half Fill Highway Subgrades, Hazard Diagnosis, Hazard Mitigations, Combined Sliding Planes