Abstract: The geographical, geotechnical and hydrogeology conditions of the Huangshi Yegang 220kV transformation station are discussed in this paper. The mechanism of the karst cavity formation is also analyzed. The stability of transformation foundations over the karst cavities are evaluated quantitatively by using FLAC 3D numerical analysis. The results indicate that the site is unstable and the maximum settlement at the ground surface will be 0.85 meters with a local collapse of some cavities. The mitigation measures are also presented in this paper.

Key words: 220 kV Transformation Station Project, Foundations in Karst Terrain, Stability Analysis