On analysis of engineering examples of collapsible loess high-filling pile foundation

According to the problems in the collapsible loess high-filling pile caused by the large deformation of the negative friction,and the lowering of loading capacity,the paper analyzes the factual engineering examples,sums up the influence of the negative friction on the loading capacity of the pile foundation,and explores the measures to reduce the negative friction's influence,so as to direct the practice and to ensure the construction quality of the pile foundation of the collapsible loess areas.