Deep Excavation Retaining Structure Calculation And Optimization,

In order to make a safe and economical design of a deep excavation support system, it is require to make a comprehensive and scientific analysis on the working state of the excavation support system, expecially its deformations, in this paper, a new finite element method based on the team-column theory, which takes into account the effect of release of lateral resistance force and transformation of structure model, is put forward in the light of the characteristics of a soft soil foundation . A calculation program for a counter analysis is also worked out in order to determine the internal force and displacement of support structure. Based on finite element method, this paper analyzed and discussed the effects of the insertion depth and stiffness of the support structure, the braced position ,the reinforced soil mass in a excavation engineering as well as brace prestress on the internal forces and deformations of the support structure and some suggestions for design of support structure are presented. Finally, the principle of design-optimization of deep excavation engineering is expounded in the paper. The main methods and ways of design-optimization are proposed.