Abstract：Based on the results of static load tests and stress tests for two large diameter cast-in-place piles in karst area，the load transfer behavior of piles is analyzed and compared. The relationship between shaft resistance and relative displacement is fitted with a hyperbolic model. According to the analysis results，the karst cave under pile-end mainly effects the shaft resistance around the whole piles. In the upper part of pile，only the critical displacement is affected while the critical displacement and limited shaft resistance are all effected in the lower part of the pile.
