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摘要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对周边环环境不构成威胁，运用的支挡，固定与保护的方法对基坑侧壁以及附近。周围环境对于基坑工程影响，同样基坑也影响着周边的环境。环境条件不同产生基坑支护开挖的设计、施工方案的结果也是的具有一点的变化。基坑开挖不仅是一个单一的工程而是一个一系列的项目。要对基坑本身的安全稳定保证、要有效的控制基坑周边安全。52532
拟建平江区行政中心设大范围地下室一层，南北向长约143m，东西向宽约154m，形状不规则，结构底板埋深为室外整平地坪标高（相当于1985国家高程基准3.40m）以下5.40m左右，相应结构底板标高为-2.00m，基坑侧壁安全等级为三级。由于基坑深度在3.5-5.2m，开挖深度较浅，地下水的测定较低，考虑到经济、施工方便等因素，采用1:0.5放坡+打土钉的基坑开挖支护方案。
本设计严格遵照相关规范的要求进行各段基坑支护设计。第一，根据所在的工程地质勘察报告初步选出支护方案。第二，进行计算每个设计参数并初步检验。第三，进行分析验算设计结构内部稳定性。第四，对设计结构作外部稳定性验算。最后，根据安全、经济、施工方便优化等许些因素考虑并确定设计最终的施工方案。
毕业论文关键词：基坑支护结构;放坡；打土钉；强度筋材度；稳定性；基坑降水。
Abstract 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.With the change point is the environmental conditions of different design, excavation of foundation pit construction scheme results. The excavation of foundation pit is not only a single project, but a series of projects. to the peripheral security control of foundation pit effectively.
The administrative center of Pingjiang District, the large range of basement, north-south length of about 143m, east-west width 154m, irregular in shape, structure of bottom depth for outdoor leveling floor elevation (equivalent to 1985 National Height Datum 3.40M) below about 5.40m, elevation corresponding to the structure bottom is -2.00m, the lateral wall of the foundation pit safety grade level three.Because of the depth of foundation pit excavation depth in 3.5-5.2m, the shallow groundwater, the determination of low, considering factors such as economic, convenient construction, foundation pit with soil nailing + 1:0.5 slope excavation and support scheme.
We must strictly comply with the relevant requirements for the design of foundation pit support. First, according to the engineering geological investigation report from the preliminary support scheme. Second, were calculated for each design parameters and preliminary test. Third, analysis of interior design structure stability checking. Fourth, to check the design structure for external stability. Finally, optimize and determine the design. Keywords the Foundation Pit Pile-anchor Injection-anchor Soil Nailing
Key words: foundation pit Bracing structure；Put the slope ；Soil nailing ；Strength of reinforcement ；Stability; Dewatering of foundation pit.
目录
第一章 绪论 1
1.1 选题的背景与目的意义 ` 1
1.3.基坑工程的主要研究内容 ` 3
1.4.基坑工程毕业设计研究方法、步骤和措施 ` 4
第二章 工程概况 5
2.1场地地形地貌现状及历史 5
2.2岩土层分布及工程特性 ` 5