某大型沉井基础关键施工过程受力分析

Mechanical Analysis on Key Construction Stages of a Large Open Caisson Foundation

大型沉井在桥梁的深水基础和悬索桥锚碇基础有着广泛的应用,但目前对沉井的研究更多关注的是沉井的下沉和施工控制,计算偏保守的采用平面简化计算,造成设计的浪费。本文采用Midas Civil软件建立了沉井基础的平面和空间实体有限元计算模型,对某锚碇沉井基础施工关键技术进行平面和空间受力分析,得到沉井的隔墙与井壁在施工阶段的受力特征,对沉井基础的设计和施工均具有较大的指导和借鉴作用。

Large open caissons are widely used as deep-water foundations of major bridges and anchor foundations of suspension bridges, but the subsidence and construction control of caissons are paid more attention to calculate conservatively with simplified plane model, which often cause major waste in design. In the paper, the plane and spatial models of the caisson are set up based on Midas Civil, and the plane and spatial mechanical analysis of two key construction stages of the anchor open caisson foundation are carried through. The mechanical characteristics of walls and isolation walls of the caissons are gained, and it is of great guidance and reference for the design and construction of open caisson foundation