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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。29857
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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。
本文先介绍了苏州地铁1号线某站的工程概况，包括水文地质和周围环境，然后通过结合对现有基坑开挖支护工法和车站实际情况的比较选择出了适合本站的开挖支护方案。本文通过土压力的计算、结构内力的计算、基坑稳定性验算，配筋、验算、支撑设计、变形估算等对基坑的开挖支护作了理论上的数据分析，最后对基坑进行土体加固、降水及防水设计。
毕业论文关键词： 地铁车站；基坑；围护结构；支撑系统；地下连续墙
Design of Shanghai Metro Guoquan Road Station Foundation Pit Enclosure Structure
Abstract: With the rapid economic development, accelerate the pace of urbanization, and constantly improve the urban construction, renovation and development of large underground space has become an inevitable trend of modern urban construction. Since the 1990s, the design theory and construction technology of excavation has been more mature, which emerged a large number of excavation method hydrogeological conditions in line with our actual projects. It is in this context that this task is to design a station for Shanghai urban rail transit design and research foundation conducted envelope and related design calculations. The main topic around Shanghai metro Guoquan road station foundation pit design, based on engineering geological conditions and hydrogeological environmental conditions surrounding the pit, supporting scheme comparison and selection, and ultimately determine the envelope using underground continuous wall, support system of steel supports, and the overall stability of foundation, overturning stability, against basal heave stability and anti-seepage stability computations, with Venus software support structure for the calculation of internal forces, complete building envelope calculation of internal forces and reinforcement. Then support the design, pit deformation estimate, excavation soil reinforcement design, foundation pit precipitation design and waterproof design.
Keywords: metro; foundation pit engineering; underground continuous wall; steel support; underground continuous wall
目录
1 绪论 1
1.1 本课题的意义 1
1.2 本课题在国内外的发展概况 1
2 工程概况 4
2.1 工程概况 4
2.2 水文地质工程地质条件 6
2.2.1 水文地质条件 6
2.2.2 工程地质层分布与特征描述 6
2.3 安全等级 8
2.3.1 基坑工程安全等级 8
2.3.2 支护结构安全等级 8
3 支护方案的选择及比较 10
3.1 围护结构的选择及比较 10
3.1.1 基坑围护结构概述 10
3.1.2 基坑围护结构方案比较及选择 12
3.2 基坑支撑结构体系的选择及比较 13
3.3 13