地下结构设计中易混淆问题辨析

Interpretation of Confusing Problems in Underground Structure Design

针对地下结构设计和施工中各种不确定因素影响结构设计安全的问题,对设计过程中常用但易混淆的概念予以分析,给出了地下结构荷载取值、结构计算、抗浮计算方法,浅埋暗挖法通道的截面形式、初期支护形式,以及相应的结论性建议;结合现场施工过程中的各种工况,给出了盾构始发、过站、调头等的边界条件和使用范围。

In the design and construction of underground structures, various uncertain factors often influence the structural design safety. In this paper,some commonly used but confusing concepts during the design process are ana- lyzed and the corresponding calculation methods are recom- mended. In the complex design of underground structure, the calculation method of load values, structure and anti- float design are given, the cross section of channels by the shallow mining method and the initial support material are proposed. Based on various operating conditions in construction process, such as the boundary conditions and ap- plying scopes of the originating, station crossing and turn around of the shield machine, the corresponding preliminary safety criteria for the structure and concluding recommendations is put forward.