【摘要】 在围护结构的分析和设计中,常规采用弹性支点m法进行围护结构变形分析,但m法只能进行围护结构的变形分析,不能进行稳定分析。笔者曾推导了基于土体极限抗力分布(由Np,αp和n三参数描述)的竖向Winkler地基梁弹塑性解答;该解答能够将围护结构的变形和稳定分析有机地统一。本文在m法和基于土体极限抗力的弹塑性方法简述基础上,结合一个单支撑围护结构事例,对两种方法进行了分析比较。结果表明:①极限抗力弹塑性方法能够同时考虑围护结构的弹塑性变形和稳定分析,给出围护结构的最小嵌入深度Lmin,而m法仅能进行变形分析;②两种方法均存在最优嵌入深度Lopt;当嵌入深度L≥Lopt,两种方法均可用于围护结构的分析和设计。更多还原

【Abstract】 For the design of retaining structures,elastic methods,such as m-method of a beam on Winkler foundation,are commonly used in practice.As a result,however,evaluations of deflection and stability of the retaining structures are irrelevant.To avoid this pitfall,an elastoplastic method was presented based on a generalized ultimate soil resistance with three parameters of Np,αp,n.The two methods were summarized and compared in combination with an assumed case study of a single propped retaining structure.It demonstrates that: ①The elasto-plastic method can predict the elasto-plastic deflection and the stability of retaining structures as well as the minimum embedment length Lmin;②An optimum embedment length Lopt exists for both m-method and the elasto-plastic method;While embedment length L≥Lopt,both of them can be soundly used to analyze and design retaining structures.更多还原