Through concrete example of engineering accidents, this paper analyzes the reasons of fragment splitting and break of pilework of common reinforced concrete pre-pile from aspects of selection of pile hammer, shock stress, design of pile top and detail structure of the pile, and discusses the concrete method of filling pile.

According to the interaction of superstructure,foundation and pilet,he pile rigidity in tower area(the core area) should be enhanced but that in outer podium area should be weaken to carry out optimal pile designT.

In the paper the design of pile foundation for Sun Palace plaza in Nanjing is introduced.

Application of calculation formula in pile foundation design;

The author analyzes the corresponding basis of multistory building pile foundation design in soft soil area,based on the research of pile foundation design methods and pile foundation calculation,discusses the foundation model of soft soil and pile foundation settlement deformation model of soft soil foundation,so as to perfect pile foundation design and accumulate experience.

In this paper,by case study of tenth building in Heaven Sent Home residential area,the author introduces several situations met during the design process of basement & the main structure,including pile foundation design,sixth degree civil air defence basement roof design and the seismic reflection of the main building.

By finite element numerical analysis and calculation,the distribution of the lateral soil pressure of supporting piles is studied to judge the rationality of design length of supporting piles,offers reference for designing of familiar project.