Settlement Analysis And Evaluation Of Pile Foundation

Along with the high—speed developing of country economic,high speed and heavy load come to be the basic characteristics of highway and railway,and building become higher and higher,their foundation support bigger and bigger structural loads,so settlement evaluation come to be an important step in design of these kind of engineering. But settlement behavior of pile foundation under axial load is the results of pile-raft-soil interaction,settlement evaluation is always a problem in design of pile foundation because of the complexity of soil profile and the variety of unstallation methods,shape and arrangement of piles. At presents, many settlement evaluation methods of pile foundation have been put forward by engineers and researchers,but these methods have their own characteristics and applicability so it is necessary to do a deep research on the settlement evaluation of piles.The main research work of this paper includes: first attention is confined to the displacement behavior and computation methods of single piles.The limitation of these methods are analyzed. And then introduce the development of these methods;second, analytical techniques of group settlement evaluation and the estimate are described. In the fourth chapter of this paper the calculating method of the negative skin friction and the settlement evaluation of the piles in collapsible loess are introduced. At last,a software of the settlement evaluation is written. The reliability of the software is validated through practical engineering examples. At the same time,how the negative skin friction influence the settlement of piles is analyzed.