东华理工大学毕业设计(论文) 封面
毕 业 设 计（论文）
题 目:苏州高新技术创业楼基坑支护结构设计 英文题目:The Design of Deep Foundation Pit Bracing
for The Start-up Building Located in Suzhou Hi-tech Industrial Zones
学生姓名: 朱小云 学 号: 04114322 指导教师: 侯龙清 专 业: 土木工程
二 零 零 八 年 六 月
东华理工大学毕业设计(论文) 摘要
摘 要
拟建中的苏州高新技术创业楼位于苏州新区，西邻珠江路，北邻竹园路，场地以北为已建一期工程。由苏州高新技术创业中心投资建设，由4幢高层及裙房，附带下沉式广场及餐饮娱乐设施组成，场地下均设有两层地下室相连通，为框剪和框架结构。建筑场地地表绝对标高在+2.48m和+3.85m之间，以1985国家高程基准为准。基坑实际开挖深度分布：北侧约7.5m，西侧及南侧、东侧均为10m。基坑开挖深度在7.00m-9.00m之间。
结合本工程地质、环境、挖深等诸多因素确定安全可靠的支护方案；为基坑土方
开挖和地下室施工创造一个安全干燥的施工环境；考虑到邻近坑边有建筑和道路（下设有水、电、气等管线），为确保安全，以“变形”控制设计。
本着“安全可靠、经济合理、技术可行、施工方便”原则，整个基坑采用一排钻孔灌注桩作挡土结构, 锚杆支撑(局部地段采用钢管竖向斜撑)作为支撑结构体系。基坑四周采用深层搅拌桩作止水帷幕。基坑内采用轻型井点降水+集水坑排水。
关键词：深基坑; 支护结构; 挡土结构; 锚杆支撑; 钢管支撑; 钻孔灌注桩
东华理工大学毕业设计(论文) Abstract
Abstract
The Hightechnical building in New district is located in SuZhou city,in the western of ZhuJiang Road and north behind ZhuYuan Road,closed with Previous Project One.The contractor,Hightechnical Development Center of Suzhou,do the construction ,consisted by 4 tall buildings and annexs,sinked plaza and catering entertainment facilities,including 2 basements,classified as frame and shearing wall construction. The average level of the construction for ?0.00, absolute level is +2.48m–+3.85 meters,according to the National 1985 regulations. The depth of excavation is between 7-9 meters.
Considering of the geologic environment, excavation depth of the foundation pit, to create an safe and dry surroundings for the earth work and basement, we carry out the design in control of displacement deformation, in order to keep main traffic roads and buildings safe and to protect pipelines of water, electricity and coal gas below the surface well.
According with fundamental technical standard, approaching safe reliability, the economical-reasonable and convenient construction and guaranteeing project time limit，we use nondisplacement piles as retaining structure, anchor rod bracing and inclined steel pipe bracing concrete bracing as bracing structures.Around the foundation pit, we use deep churning piles as detaining water pile construct enclosed cut off trench. With the purpose of dewatering, we use sump and well point .
Key words: Foundation pit; Bracing structure; Retaining structure; Anchor Rod bracing ; Steel Pipe bracing; Nondisplacement pile
东华理工大学毕业设计(论文) 目录
目 录
绪 论 .................................................................... 1 1 基坑基本概况 ........................................................... 2 1.1 基坑工程概况 ......................................................... 2 1.1.1 工程概况 ........................................................... 2 1.1.2 周边环境 ........................................................... 2 1.2 地质条件 ............................................................. 2 1.2.1 工程地质条件 ....................................................... 2 1.2.2 水文地质条件 ....................................................... 4 2 基坑支护方案选择 ....................................................... 5 2.1 基坑支护设计基本要求 ................................................. 5 2.2 基坑支护方案选择 ..................................................... 5 2.2 计算方案 ............................................................. 6 3 基坑降止水设计 ........................................................ 13 3.1 基坑止水计算 ........................................................ 13 3.1.1 西侧挖深7.5米抗管涌计算 .......................................... 13 3.1.2 北侧挖深7.0米抗管涌计算 .......................................... 14 3.1.3 南侧挖深9.0米抗管涌计算 .......................................... 14 3.2 基坑降水计算 ........................................................ 14 3.2.1 降水井型 .......................................................... 14 3.2.2 井点埋深 .......................................................... 14 3.2.3 环形井点引用半径 .................................................. 15 3.2.4 井点抽水影响半径 .................................................. 15 3.2.6 基坑单井出水量计算 ................................................ 17 3.2.7 基坑单井数量和井间距确定 .......................................... 17 3.2.8 基坑单井数量复核验算 .............................................. 17 3.2.9 基坑井降水深度验算 ................................................ 18 4 基坑支护设计 ......................................................... 19 4.1 基坑支护方案设计参数说明 ............................................ 19 4.1.1 地质力学指标参数 .................................................. 19
东华理工大学毕业设计(论文) 目录
4.1.2 基坑实际挖深 ...................................................... 19 4.1.3 地面堆载Q取值 .................................................... 20 4.1.4 计算方法 .......................................................... 20 4.1.5 土压力 ............................................................ 20 4.1.6 计算模式 .......................................................... 20 4.1.7 标高规定 .......................................................... 20 4.1.8 有关设计参数确定 .................................................. 20 4.1.9 设计水位确定 ...................................................... 20 4.2 西侧AB段和东侧DE段基坑支护结构计算 ................................ 20 4.2.1 土层厚度 .......................................................... 20 4.2.2 土压力强度 ........................................................ 21 4.2.3 桩锚支撑布置 ...................................................... 23 4.2.4 支撑反力计算和桩的配筋计算： ...................................... 24 4.2.5 锚杆计算 .......................................................... 28 4.2.6 桩顶圈梁和锚座腰梁设计 ............................................ 30 4.2.7 变形控制验算 ...................................................... 30 4.3 南侧BCD段支护结构计算 .............................................. 40 4.3.1设计参数说明 ....................................................... 40 4.3.2 土压力强度计算 .................................................... 40 4.3.3 桩锚支撑布置 ...................................................... 42 4.3.4 支撑反力计算和桩的配筋计算 ........................................ 43 4.3.5 锚杆计算 .......................................................... 49 4.3.6构件变形计算 ....................................................... 52 4.3.7 圈梁和锚座腰梁的构造计算 .......................................... 52 4.4 北侧EF段和FGA段基坑支护结构计算 ................................... 53 4.4.1 设计参数说明 ...................................................... 53 4.4.2.土压力强度计算 .................................................... 54 4.4.3 EF段，FGA段桩圈梁和竖向斜支撑的布置 .............................. 58 4.4.4 EF段支撑反力计算和桩的内力计算 .................................... 58 4.4.5 FGA段支撑反力计算和桩的内力计算 ................................... 60 4.4.6 各区段圈梁和竖向斜撑的计算 ........................................ 61 5 基坑稳定性验算 ........................................................ 66