苏州吴中苏地2017-WG-24号地块基坑支护设计

论文总字数：42841字

摘 要

近年来我国经济建设发展迅速，在此发展过程当中，交通设施的建设与城市建设的规模呈逐渐扩大的趋势，尤其是城市的现代建筑大多以高层或者超高层的建筑为主。而在基坑工程的开挖工作当中，我们经常会遇到类似于地基土工程地质性质较差、场地紧凑、距离建筑物过近、基坑开挖尺度和深度过大以及周边环境、管线复杂等问题，从而使基坑工程的开挖与施工受到一定约束。本文以苏州市苏地2017-WG-24号地块项目工程作为背景，根据基坑设计的相关规范要求，并结合类似工程的成功经验，采用SMW工法桩即φ850@1200三轴搅拌桩内插700^*300H型钢（隔一插一）支护形式，靠近已建建筑侧采用灌注桩支护形式，水平设置一道支撑，为预应力组合型钢支撑。本文做的主要工作内容如下：

1、充分了解苏地2017-WG-24号地块的地质概况，研究阅读提供的详勘资料、勘察报告，明确基坑施工过程可能出现的地质问题，进而确定基坑支护系统的选型，为接下来的设计与计算做好前期准备。

2、通过理正深基坑计算软件，依托该实际工程项目，计算出支护桩的受力情况以及截面尺寸，为之后的设计计算提供依据；通过手算得出水平支撑、立柱及降水井的相关尺寸，根据计算结果完成基坑支护的设计。

3、运用CAD软件对整个基坑的围护系统平面图及剖面图进行设计绘制，并根据计算结果绘制出基坑围护结构、基坑支撑及降水井的大样图。

关键词：基坑支护，支撑形式，降水。

ABSTRACT

In recent years, China's economic construction has developed rapidly. In this process, the scale of transportation installation and urban construction is expanding gradually. Especially, most of the modern buildings in cities are high-rise or super-high-rise buildings. In the excavation of foundation pit engineering, we often encounter such problems as poor geological properties of foundation soil engineering, compact site, too close to buildings, too large scale and depth of foundation pit excavation, complex surrounding environment and pipelines, which restrict the excavation and construction of foundation pit engineering. Based on the engineering background of Sudi 2017-WG-24 block project in Suzhou, according to the relevant specifications of foundation pit design and combined with the successful experience of similar projects, this paper adopts SMW method pile, i.e. 850@1200 triaxial deep mixing pile, to insert 700*300H steel (every other insert) support form, and adopts cast-in-situ pile support form near the side of the existing building, with a support set horizontally for the pre-stressed group. Section steel support. The main work of this paper is as follows:

1. Fully understand the geological situation of Sudi 2017-WG-24 block, study and read the detailed survey data and survey report, clarify the geological problems that may occur in the process of foundation pit design, and then determine the selection of foundation pit, in order to prepare for the next design and calculation.

2. Based on the calculation software of the rational deep foundation pit, relying on the actual project, the force condition and section size of the support pile are calculated to provide basis for the subsequent design calculation; the relevant dimensions of the horizontal support, column and precipitation well are obtained by hand calculation. According to the calculation results, the design of foundation pit support is completed.

3. The CAD software is used to design and draw the plan and section of the enclosing system of the foundation pit. According to the calculation results, the foundation pit supporting structure, the foundation pit support and the large sample of the precipitation well are drawn.

KEY WORDS: Foundation pit support, Supporting form，precipitation

目 录

摘要……………………………………………………………………………………………Ⅰ

Abstract ……………………………………………………………………………………… Ⅱ

目录……………………………………………………………………………………………Ⅲ

第一章 绪论1

1.1设计背景1

1.2设计难点1

1.3设计方案及相关建议2

第二章 工程概况3

2.1工程概况3

2.2工程地质概况4

2.2.1地形、地貌4

2.2.2场地岩土工程性质4

2.3水文地质条件7

2.3.1区域水文地质7

2.3.2地下水7

2.4支护方案选择7

2.4.1基坑特点7

2.4.2基坑开挖注意的问题7

2.4.3基坑工程可能造成的工程风险8

2.4.4基坑围护型式比选8

2.5支护设计依据10

第三章 支护桩设计计算11

3.1临近建筑物受破坏分析11

3.1.1早期评估工作11

3.1.2建立新的评估模型11

3.1.3模型总结15

3.2支护桩结构计算16

3.2.1三轴搅拌桩支护（AB段）16

3.2.2钻孔灌注桩支护（DA段）30

第四章 水平支撑计算44

4.1圈梁计算44

4.2钢支撑设计计算44

4.2.1角撑钢支撑设计计算44

4.2.2对撑钢支撑设计计算46

第五章 竖向支撑计算49

5.1立柱桩上荷载计算49

5.2立柱桩上部钢立柱强度验算49

5.3立柱桩下部桩承载力验算49

第六章 降水设计计算50

6.1降水方案对比和选择50

6.2降水计算50

6.2.1抗渗流50

6.2.2抗突涌51

第七章 基坑监测52

7.1监测目的52

7.2监测内容52

7.3监测要求52

7.4监测频率53

7.5监测预警值53

第八章 结论与展望54

8.1结论54

8.2展望54

参考文献55

致谢56

附录57

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