1. Code for Design of Building Foundation (GBJ 7–89) [S]. 1989 . Beijing : Chinese Building & Architecture Press .
2. Technical Code for Building Pile Foundation (JGJ 94–94) [S]. 1995 . Beijing : Chinese Building & Architecture Press .
3. Wu , Y. 1998 . Pile testing report of project III of Zhangze Power Plant [R] . Taiyuan : Shanxi Power Institute of Design and Survey .
4. Wubin He . 1999 . The experimental study of cap-pile group-soil interaction [D] . Taiyuan : Master Degree Thesis of Taiyaun University of Technology .