资料简介： 摘 要
基坑工程是指在地表以下开挖的一个地下空间及其配套的支护体系。而基坑支护就是为保证基坑开挖，基础施工的顺利进行及基坑周边环境的安全，对基坑侧壁以及周边环境采用的支挡，加固与保护措施。
基坑支护体系是临时结构，安全储备较小，具有较大风险，基坑工程具有很强的区域性。不同水文，工程地质环境条件下基坑工程的差异很大。基坑工程环境效应复杂，基坑开挖不仅要保证基坑本身的安全稳定，而且要有效的控制基坑周边地层移动以及保护周围环境。
本文在第1章中介绍了深基坑的发展状况、人们对其设计理论的研究状况及重点研究方向；第2章主要介绍了基坑支护的一些常用方法及各自的特点；在第3章中，从排桩的计算、止水、降水以及钢支撑稳定性分析方面对深基坑计算理论进行了阐述，最后还介绍了施工监测方面的内容；第4章通过对深圳地铁工点的具体分析，运用前面讲到的理论方法，对基坑支护进行了设计；第5章对施工组织设计做了一个简单的设计，着重介绍了土方的开挖顺序、挖孔桩和钢支撑的施工工艺。
关键词：基坑支护结构 人工挖孔桩 钢支撑 施工组织设计Abstract
Foundation Pit is the excavation of an underground space below the surface and a coordinated support system. Bracing of foundation pit is to ensure that excavation and foundation construction for the smooth and safe environment Foundation Pit and used the pit retaining wall reinforcement and protection.
Bracing of Foundation Pit structure is the structural safety of temporary reserves are smaller, more risk. Foundation pit structure has a strong regional. Excavation works under different hydrological environmental and geological conditions are vastly. Effects complex excavation, excavation pit is not only necessary to ensure their own safety，but also to effectively control the pit surrounding strata.
In chapter 1, it introduces the development of deep foundation pit, and the study of the design theory, and the major research direction; In chapter 2, it primarily introduces some methods of the foundation bracing and respective characteristic; In chapter 3, it gives readers a presentation to the theory of computation of deep foundation pit, through calculation of piling, water-stop, dewatering and the stability analysis of steel bracing. In the end, it introduces some content about supervisory survey of construction; In chapter 4, through detailed analysis of construction site and the application of the theory method mentioned above, it finishes the design of the deep foundation bracing; In chapter 5, it designs the construction management plan simply, among which earth excavation sequence and the construction techniques of dug pile and steel timbering are recommend highlighted.
key words: Bracing of Foundation Pit Structure, Artificial digged-hole pile, Steel Timbering, Construction Management Plan
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