The theory of Biot consolidation and modified model of Cambridge Clay are adopted in this paper,and the plane FEM is applied to the study on the force and deformation of pitbracing system in Shanghai Clay.

• 采用比奥固结理论和修正剑桥模型，将平面有限元法应用于上海地区软土基坑围护体系的受力及变形分析。