论文总字数：47740字
摘 要
综合管廊在地下管线统一规划、管理和维护等方面的优秀表现，使其成为城市在进行地下空间资源开发方案决策时的首选。然而，鉴于初期投资巨大和管线集中管理困难等方面的阻碍，综合管廊在国内的发展步履维艰。因此，选择经济合理的综合管廊施工方案将对其发展具有战略性的意义，特别是在一些特殊地质条件的地区。本文针对软土地基上综合管廊的施工提出一种新的比选思路以供研究。
本文依托南京市浦口新城核心区综合管廊项目，利用有限元软件Midas/GTS分别对明挖现浇法、顶管法和盾构法这三种施工方法进行数值模拟分析。对不同工法造成的变形和沉降进行对比分析，得出结论：盾构法表现最好、顶管法其次、而明挖现浇法造成的变形和沉降最大。之后，结合AHP法和TOPSIS法进行数学模型构建，从施工难易程度、施工安全性、工程造价、工程进度、对交通的影响和对周围的影响这六个方面对三种施工工法进行综合比较，分析发现：顶管法在综合比选的最终得分最高，明挖现浇法得分最低。
经过本文研究，发现被大多数综合管廊施工采用的明挖现浇法并不一定是最合理的施工方案。故给出建议：决策者在选择软土地基上的综合管廊的施工方案时，应该从更全面的角度进行比选，结合多种比较手段，以得出合理、科学、经济和全面的结果。
关键词：综合管廊；软土地基；明挖现浇法；顶管法；盾构法；施工方案比选
Abstract
Utility tunnel have outstanding performance in unified planning, management and maintenance of the underground pipeline, so it become the first choice of a city in decision-making for underground space resource development program. However, resulting from the huge initial investment and the difficult of pipeline centralized management, utility tunnel have bad develope in domestic. So, chosing the economic and reasonable utility tunnel construction plan is strategic significance in development, especially in some special geological conditions of the region. This paper aim to utility tunnel construction on soft soil ground to put forward a new thought of comparison for research.
This paper, by using Midas/GTS relying on Nanjing Pukou new town centrel area utility tunnel project geological exploration data, respectively, to open cut method, pipe jacking method and shield tunneling method these three construction method for numerical simulation modeling. By simulation analysis the displacement and subsidence caused by different methods, concluded that the shield method is best, pipe jacking method is second best, and open cut method has caused the most deformation and settlement. After combining with AHP method and TOPSIS method in mathematical model building. By using mathematical model, from the ease of construction, the construction safety and engineering cost, construction schedule, influence on traffic, and the impact on the surrounding the six aspects of three construction methods are compared, and the comprehensive analysis found that: the pipe jacking method in comprehensive than the final score of the highest, lowest scoring open cut method.
This study found, most utility tunnel construction is not necessarily open cut method is the most reasonable construction scheme. Therefore, suggestions: decision makers in the utility tunnel construction on soft soil ground, should from the perspective of a more comprehensive comparison, compared with a variety of means, to conclude the result of the rational and scientific, economic and comprehensive.
Key words: Utilily tunnel; Soft soil foundation; Open cut method; Pipe jacking method; Shield
tunneling method; Scheme comparison
目 录
摘 要..............................................................................................................................................I Abstract.............................................................................................................................................II
- 绪 论.................................................................................................................................1
- 研究背景和意义...................................................................................................1
- 研究背景.......................................................................................................1
- 研究意义.......................................................................................................2
- 研究的主要任务、思路及难点...........................................................................2
- 研究的主要任务...........................................................................................2
- 研究的思路...................................................................................................3
- 研究的难点...................................................................................................4
- 研究综述.............................................................................................................................5
第一节 综合管廊及其国内外发展现状...........................................................................5
一、综合管廊的概念...........................................................................................5
二、综合管廊的分类...........................................................................................5
三、综合管廊的一般规定...................................................................................6
四、综合管廊的优缺点.......................................................................................6
五、综合管廊的国内外发展现状.......................................................................7
第二节 软土地基及其研究现状.......................................................................................9
一、软土地基的概念...........................................................................................9
二、软土地基问题处理办法的国内外研究现状.............................................10
三、各软土地基问题处理办法的原理及特点.................................................10
第三节 软土地基上工程施工方法的研究现状.............................................................11
一、软土地基上的明挖现浇施工工法研究现状.............................................11
二、软土地基上的顶管施工工法研究现状.....................................................11
三、软土地基上的盾构施工工法研究现状.....................................................12
第四节 本章小结.............................................................................................................12
- 工程概况...........................................................................................................................14
第一节 工程简介.............................................................................................................14
第二节 场地工程地质条件.............................................................................................14
一、地形、地貌.................................................................................................14
二、场地各岩土层分布及其性质....................................................................14
第三节 场地水文地质条件及场区地下水、土的腐蚀性分析评价.............................16
第四节 场地岩土性质指标.............................................................................................16
一、岩土参数的分析.........................................................................................16
二、岩土参数的选定.........................................................................................16
三、地基承载力特征值的确定.........................................................................16
- 场地稳定性及不良地质作用.............................................................................18
一、场地稳定性评价.........................................................................................18
二、不良地质作用评价.....................................................................................19
- 数值模拟...........................................................................................................................20
- Midas/GTS简介.................................................................................................20
一、Midas/GTS..................................................................................................20
二、MIdas/GTS特点.........................................................................................20
三、MIdas/GTS适用范围.................................................................................21
- 模型建立.............................................................................................................21
一、明挖现浇法模型.........................................................................................22
二、顶管法模型.................................................................................................23
三、盾构法模型.................................................................................................24
- 分析结果.............................................................................................................25
- 整体位移分析.............................................................................................25
二、周边道路沉降分析.....................................................................................29
- 小结.....................................................................................................................33
一、整体位移分析.............................................................................................33
二、周边道路沉降分析.....................................................................................33
- 基于AHP——TOPSIS评价模型的施工方案综合比选...............................................34
- 主要施工方法和施工工艺简介........................................................................34
一、明挖现浇法................................................................................................34
二、顶管法........................................................................................................34
三、盾构法........................................................................................................34
四、其他施工方法............................................................................................35
- 比选方法............................................................................................................35
一、比选方法概述...........................................................................................35
二、AHP和TOPSIS方法简介.......................................................................35
三、AHP一TOPSIS模型...............................................................................36
- 比选标准............................................................................................................38
一、施工难易程度...........................................................................................38
二、施工安全性...............................................................................................39
三、工程造价...................................................................................................39
四、工程进度...................................................................................................39
五、对交通的影响...........................................................................................39
六、对环境的影响...........................................................................................39
- 比选过程............................................................................................................40
一、构建关系表...............................................................................................40
二、构造准则层——方案层的判断矩阵.......................................................40
三、构造目标层——准则层的判断矩阵.......................................................44
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