Abstract: This paper presents the geotechnical characterization results of the palokarst at an extralarge bridge site in Ji′an, Jiangxi Province. The regional geological information and field geotechnical investigation data are evaluated. The geological origin, development as well as consequence aspects of the palokarst that deposits within Ji′an region are summarized in the paper. The stability of the karst within the project site and the karst development are also evaluated for the bridge design and construction purposes.

Key words: Ji′an County of Jiangxi Province； Karst Deposits；Palaeokarst；Karst Developments； Trend of Developments, Site Stability