[提要]  通过对某工程实例的反分析计算，提出了建立在可靠度分析基础之上的深基坑桩撑支护结构优化设计方法。为了进行支护结构的可靠性设计，探讨了随机变量对支护结构设计的影响，并给出了进行支护结构计算的实例。
[关键词]  深基坑 桩撑支护结构  可靠性设计

Through the back-analysis of a computing example, the design optimhation of pile-strut bracing struc-
ture of deep foundation pit is presented based on reliability analysis. In order to proceeding the reliability design of bracing structure, the author suggests that random variables have an influence on the design of bracing.structure and gives a computing example.
Keywords: deep foundation pit; pile-strut bracing structrue;reliability analysis