Stress-deformation behavior of ground under excavation and development of new design methods

点击翻译按钮获取中文摘要

Two-dimensional model tests and elastoplastic finite element analysis for excavation problems with braced wall are performed to investigate the influence of construction history , the wall friction, the wall stiffness and the struts on the ground movements and the earth pressure on the wall. Test results show that the surface settlements of the backfill and earth pressure on the wall depend on the deflection process of the wall, even if the final wall deflection are the same. The wall friction, the wall stiffness and the position and stiffness of strut affect significantly the earth pressure on the wall and the ground movement including the surface settlements. The computed results, in which mechanical behavior of soil and structure, behavior of interface between soil and wall and the process of excavation were property taken into consideration, describe well the results obtained in the model tests. Such influence on the deflection of the wall, the earth pressure on the wall and the ground movements including surface settlements under excavation has not been evaluated property in the present design practice.