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1、 摘要经过多年的发展，深基坑工程已发展成为一门综合性的学科。随着高层、超高层建筑项目日益增多，地下工程的大量施工，基坑开挖深度越来越深，开挖面积逐渐增大，相对的是场地越来越狭窄，使施工所遇到的难度也越来越大，因为在深基坑开挖支护过程中，不仅要保证基坑自身的稳定，还必须保证临近建筑设施的安全与稳定。如何优化选择一种既能保证深基坑开挖施工过程中的安全稳定性，又能取得较好经济效益的深基坑支护结构方案，一直以来都是基坑工程研究的首要问题。目前基坑支护结构种类很多，如何根据实际需要选择合适的支护结构并合理地确定支护结构的参数仍然是一个难题。由于排桩支护结构具有环境影响小、地层适应性强等优点，被广泛用于基
2、坑支护工程中。本文以排桩支护结构为研究对象，深入研究其结构问题。本文首先对深基坑支护结构的工程特点进行了论述，介绍了几种常用深基坑支护的结构类型；然后，论文介绍了排桩内支撑的概念，排桩支护类型及支撑类型，简述了其应用范围，对排桩支护结构的计算理论进行较为全面、系统的分析和研究；最后，对基坑开挖 9m的实际工程采用排桩钢支撑支护结构应用等值梁法进行了设计计算 ,使用同济大学启明星软件进行整体计算、校核、编制计算书，计算结果可供工程设计和施工参考。关键词：深基坑；深基坑支护；等值梁法；单排桩钢支撑 AbstractAfter years of development, deep foundatio
3、n pit engineering has developed intoa comprehensivediscipline. With high-level, high-rise building projects increasing,the underground engineering of construction, more and more deep foundation pitexcavation depth, excavation area increases gradually, relative field is more and morenarrow, make cons
4、truction encountered the difficulty also bigger and bigger, becausein the process of deep foundation pit excavation supporting, it should not onlyguaranteethe stability of foundation pit itself, also must guaranteethe safety ofadjacent building facilities and stability. How to optimally choose a dee
5、p foundationpit supporting structure scheme that can not only ensure the safety in the process ofexcavation of deep stability, also obtain good economic benefits has always been theprime problem of the foundation pit engineering research.The foundation pit supporting structure is a lot of more phyle
6、tic, how to chooseappropriate supporting structure according to actual needs and reasonably determinethe parameters of the supporting structure is still a problem. Due to pile supportingstructure has the advantages of small environmental impact, formation strongadaptability, is widely used in founda
7、tion pit supporting engineering. Based on thepile supporting structure as the researchobject, the further this article study of thestructure.This article first discusses the engineering characteristics of deep foundation pitsupporting structure, this paper introduces several common types of deep fou
8、ndationpit supporting structure; Then, the paper introduces the concept of pile brace, the pilesupporting type and support type, describes its application scope, Through thecalculation theory of pile supporting structure is more comprehensive and systematicanalysis and research;Finally, the excavati
9、on of the 9 m engineering using pile steelsupport application of equivalent beam method for the design and calculation ofretaining structure, using the Tongji university Qim star for integral calculation, check,formulation of calculation, the calculation results can be used for referencein theengine
10、ering design and construction. Keywords: deep foundation; deep foundation pit support; equivalent beam method;single pile steel support目录摘要 . IAbstract. II第一章绪论 .11.1本文研究意义 .11.2基坑排桩支护结构的发展状况 .41.3排桩内支撑支护结构形式 .61.3.1排桩支护类型 .71.3.2排桩支撑类型 .111.4本文主要研究内容 .13第二章基坑排桩支护结构设计基本理论 .152.1基坑支护设计基本原则 .152.2侧壁安全等级及重要性系数 .152.3土压力理论 .162.3.1经典土压力理论 .172.3.2水压力计算理论 .202.4单支点排桩支护设计和计算 .222.4.1自由端单支点支护桩的计算（平衡法） .232.4.2等值梁法 .232.4.3 M法 .
