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摘要本文的主要内容是为一工程设计基坑支护结构、止降水方案及监测方案。 待设计工程为一单建地下停车场，基坑平面呈梯形，长约170m，宽约 90~126m。基坑大部分开挖深度为 12.95m，局部 14.5m，开挖范围内土层分布复杂。工程周边为主要市政道路，道路下管线众多，情况复杂。 本文借助手工计算和理正深基坑设计软件F-SPW7.0，遵照最新规范《建筑基坑支护技术规程》（JGJ120-2012）进行支护结构的设计计算。通过查询相关规范及工程实例，完成了止降水及监测方案。最后。利用岩土工程有限元软件PLAXIS 3D TUNNEL 对基坑开挖工况进行模拟，对支护结构的内力及变形等进行计算，并与F-SPW7.0 计算结果对比分析，发现F-SPW7.0 在联合支护系统的设计、整体稳定验算等有不足之处。 61115
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毕业论文关键词 基坑支护 设计 降水 监测 有限元分析
Title Design of underground parking in one city—design of excavation bracing system and finite element analysis
Abstract The main contents of this paper is to make a design including retaining and protection structures and a groundwater control scheme and a monitoring scheme for an underground parking excavation. The excavation is about 170m long and 90~126m wide, most areas excavated to the depth of 12.95m and 14.5m in few areas with complex distribution of soil. The environment condition is complicate for the municipal road around and numerous pipes under it. This paper makes use of the software Lizheng F-SPW7.0 and manual calculation to do the design following the latest specification-Technical Specification for Retaining and Protection of Building Foundation Excavations (JGJ120-2012). After the accomplishment of the groundwater control scheme and monitoring scheme, this paper establishes a three-dimensional excavation continuum finite element model to simulate the excavation by software PLAXIS 3D TUNNEL, and several disadvantages in designing combined bracing system and stability calculation of F-SPW7.0 appear compare to the calculate result of PLAXIS 3D TUNNEL.
Keywords excavation bracing design dewatering monitoring finite element analysis
目次
1引言.1
1.1基坑工程概述1
1.2本文主要内容、研究方法及研究意义..1
2工程概况..3
2.1工程简介..3
2.2场地工程地质及水文条件.3
2.2.1地形、地貌.3
2.2.2地层及岩性.3
2.2.3水文地质条件4
3基坑支护方案设计.5
3.1设计依据..5
3.2重难点分析.5
3.2.1环境条件..5
3.2.2理论条件..6
3.3基坑安全等级的确定7
3.4支护形式的确定..8
3.4.1基坑支护一般形式及其适用条件.8
3.4.2支护形式的选取..8
3.4.3“上部土钉-下部桩锚”联合支护结构..9
3.5支护方案的设计计算.10
3.5.1计算说明10
3.5.2上部土钉的设计计算.11
3.5.31-1剖面下部桩锚设计计算22
3.5.4其他各剖面下部桩锚设计计算44
3.6各剖面支护方案51
4基坑降排水设计54
4.1降水方法的选择确定.54
4.2降水方案的设计计算.55
4.2.1涌水量计算..55
4.2.2井数计算56
4.3井数确定及井点布置.57
4.4管井设计57
4.5外排系统57
4.6降水监测57
4.4.1水位观测井的设置..57
4.4.2地下水位观测频率..58
4.4.3降水速度控制.58
5基坑监测59
5.1监测项目的选择59
5.2监测方案59
5.2.1沉降观测59
5.2.2位移观测60
5.2.3护坡桩钢筋应力检测.60