某隧道工作井深基坑施工.doc
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某隧道工作井深基坑施工,摘要随着现代城市建设的快速发展，地下空间的进一步开发利用，深基坑工程施工对周围环境的影响已受到高度重视。如何有效控制基坑开挖过程中围护结构变形、坑周土体位移，保护周围建筑及公用设施安全是基坑工程必须考虑的问题。本文以上海市长江西路越江隧道工程浦东工作井深基坑工程为背景，对软土地区深基坑的开挖、支护施工全过程中围护结构及...
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摘 要
随着现代城市建设的快速发展，地下空间的进一步开发利用，深基坑工程施工对周围环境的影响已受到高度重视。如何有效控制基坑开挖过程中围护结构变形、坑周土体位移，保护周围建筑及公用设施安全是基坑工程必须考虑的问题。本文以上海市长江西路越江隧道工程浦东工作井深基坑工程为背景，对软土地区深基坑的开挖、支护施工全过程中围护结构及土体变形规律及控制措施展开研究，主要内容如下：
1、对上海长江西路越江隧道工程浦东工作井28m超深基坑开挖过程中的围护结构及周边土体位移进行实测研究，根据该基坑的支护结构设计及施工方案，制定了相应的监测方案；对不同工况下地下连续墙侧向位移、墙顶沉降、墙后土体沉降、支撑轴力、格构柱沉降以及基坑周围建筑物沉降进行全过程监测；对监测结果进行了深入分析，得到了多支撑基坑在不同工况下，围护墙体位移随深度的变化规律、格构柱沉降和连续墙墙顶沉降随时间变化规律、支撑轴力随时间变化规律、墙后土体沉降与水平距离之间的变化规律等，为同类基坑设计提供参考。
2、对工程围护方案，按照实际施工工况，进行施工全过程三维有限元模拟，模拟过程中考虑土体非线性、土与结构的共同作用等；借助ADINA有限元软件，求得不同工况下围护墙体位移、坑底回弹、支撑轴力、墙后土体的位移等。
3、对上海市长江西路越江隧道新建工程浦东工作井深基坑工程现场实测数据与数值模拟结果进行比较，分析存在差别的原因及数值模拟的不足，为超深基坑设计提出合理建议。
关键词 软土；超深基坑；监测分析；有限元；变形特性
Abstract
With the rapid development of modern urban construction, and further development and utilization of underground space, the deep foundation construction on the surrounding environment influence has been highly valued. How to control the retaining structure deformation and soil displacement around deep foundation, protect the surrounding buildings and public facilities is the question which must be considered in excavation process. Background in Pudong working well of Shanghai West Changjiang Road Tunnel, a series of studies for deformation law and control measures of retaining structure and soil in the whole process of excavation and supporting construction of deep foundation in soft soil area is carried out, the main contents are as follows:
1.At the excavation process of foundation with depth of 28m of Pudong working well of Shanghai West Changjiang Road Tunnel, retaining structure deformation and surrounding displacement of soil are actually measured and researched, and the appropriate monitoring scheme is formulated according to the design and construction project of supporting structure of this foundation. In different conditions, the lateral displacement and the vertical displacement of diaphragm wall, the settlement of lattice column and soil behind the wall, the axial force of struts, and the settlement of existing buildings are made on monitoring in the whole process. A profoundly analysis is made to monitoring results, then obtained the laws of the displacement of diaphragm wall varied with depth, the settlement of lattice column and the vertical displacement of diaphragm wall varied with time, the axial force of struts varied with time, and the settlement of soil behind the wall varied with horizontal distance, can provide a reference to design of same foundation.
2.The full construction process of the retaining scheme in this project was simulated by three-dimensional finite element software-ADINA according to the actual construction conditions, the nonlinear of soil and interaction between soil and structure are considered in simulation process. The displacement of diaphragm wall, soil resilience, the axial force of struts, the displacement of soil behind the wall, and so on are obtained in different conditions.
3.The actual measurement data and numerical simulation results are compared in the project of Pudong working well of Shanghai West Changjiang Road Tunnel, the reason of being differences and lack of numerical simulation is analyzed, can propose a reasonable advice for the design of deep foundation.
Key words soft soil; super-deep foundation; monitoring analysis; finite element; deformation characteristics
目 录
摘 要 I
Abstract III
第1章 绪论 1
1.1 引言 1
1.2国内外研究现状 1
1.2.1 坑底回弹研究 2
1.2.2 坑周土体变形研究 3
1.2.3 基坑工程变形特性时间效应研究 5
1.2.4 土与支护结构的相互作用研究 6
1.3 本文研究的主要内容 7
第2章 软土中大型深基坑工程实测研究 9
2.1 软土及软土地区基坑工程特点 9
2.2 工程概况 10
2.2.1 工程简介 10
2.2.2 工程地质及水文地质概况 10
2.3 基坑支护设计方案 12
2.4 施工工况 13
2.5 监测点的布设 14
2.5.1 监测控制网的布设 14
2.5.2 浦东工作井监测点的布设 14
2.6 监测作业方法 17
2.6.1 控制测量 17
2.6.2 地下连续墙测斜 18
2.6.3 沉降观测 19
2.6.4 支撑轴力监测 19
2.7 监测结果分析 20
2.7.1 连续墙侧向位移 20
2.7.2 连续墙墙顶沉降 26
2.7.3 格构柱沉降 27
2.7.4 支撑轴力 28
2.7.5 墙后地表沉降 31
2.7.6 建筑物沉降监测 33
2.8 本章小结 34
第3章 基坑开挖有限元分析 36
3.1本构模型 36
3.1.1 支护结构的本构模型 36
3.1.2 土体本构模型 36
3.2土与结构接触单元模型 38-br..
随着现代城市建设的快速发展，地下空间的进一步开发利用，深基坑工程施工对周围环境的影响已受到高度重视。如何有效控制基坑开挖过程中围护结构变形、坑周土体位移，保护周围建筑及公用设施安全是基坑工程必须考虑的问题。本文以上海市长江西路越江隧道工程浦东工作井深基坑工程为背景，对软土地区深基坑的开挖、支护施工全过程中围护结构及土体变形规律及控制措施展开研究，主要内容如下：
1、对上海长江西路越江隧道工程浦东工作井28m超深基坑开挖过程中的围护结构及周边土体位移进行实测研究，根据该基坑的支护结构设计及施工方案，制定了相应的监测方案；对不同工况下地下连续墙侧向位移、墙顶沉降、墙后土体沉降、支撑轴力、格构柱沉降以及基坑周围建筑物沉降进行全过程监测；对监测结果进行了深入分析，得到了多支撑基坑在不同工况下，围护墙体位移随深度的变化规律、格构柱沉降和连续墙墙顶沉降随时间变化规律、支撑轴力随时间变化规律、墙后土体沉降与水平距离之间的变化规律等，为同类基坑设计提供参考。
2、对工程围护方案，按照实际施工工况，进行施工全过程三维有限元模拟，模拟过程中考虑土体非线性、土与结构的共同作用等；借助ADINA有限元软件，求得不同工况下围护墙体位移、坑底回弹、支撑轴力、墙后土体的位移等。
3、对上海市长江西路越江隧道新建工程浦东工作井深基坑工程现场实测数据与数值模拟结果进行比较，分析存在差别的原因及数值模拟的不足，为超深基坑设计提出合理建议。
关键词 软土；超深基坑；监测分析；有限元；变形特性
Abstract
With the rapid development of modern urban construction, and further development and utilization of underground space, the deep foundation construction on the surrounding environment influence has been highly valued. How to control the retaining structure deformation and soil displacement around deep foundation, protect the surrounding buildings and public facilities is the question which must be considered in excavation process. Background in Pudong working well of Shanghai West Changjiang Road Tunnel, a series of studies for deformation law and control measures of retaining structure and soil in the whole process of excavation and supporting construction of deep foundation in soft soil area is carried out, the main contents are as follows:
1.At the excavation process of foundation with depth of 28m of Pudong working well of Shanghai West Changjiang Road Tunnel, retaining structure deformation and surrounding displacement of soil are actually measured and researched, and the appropriate monitoring scheme is formulated according to the design and construction project of supporting structure of this foundation. In different conditions, the lateral displacement and the vertical displacement of diaphragm wall, the settlement of lattice column and soil behind the wall, the axial force of struts, and the settlement of existing buildings are made on monitoring in the whole process. A profoundly analysis is made to monitoring results, then obtained the laws of the displacement of diaphragm wall varied with depth, the settlement of lattice column and the vertical displacement of diaphragm wall varied with time, the axial force of struts varied with time, and the settlement of soil behind the wall varied with horizontal distance, can provide a reference to design of same foundation.
2.The full construction process of the retaining scheme in this project was simulated by three-dimensional finite element software-ADINA according to the actual construction conditions, the nonlinear of soil and interaction between soil and structure are considered in simulation process. The displacement of diaphragm wall, soil resilience, the axial force of struts, the displacement of soil behind the wall, and so on are obtained in different conditions.
3.The actual measurement data and numerical simulation results are compared in the project of Pudong working well of Shanghai West Changjiang Road Tunnel, the reason of being differences and lack of numerical simulation is analyzed, can propose a reasonable advice for the design of deep foundation.
Key words soft soil; super-deep foundation; monitoring analysis; finite element; deformation characteristics
目 录
摘 要 I
Abstract III
第1章 绪论 1
1.1 引言 1
1.2国内外研究现状 1
1.2.1 坑底回弹研究 2
1.2.2 坑周土体变形研究 3
1.2.3 基坑工程变形特性时间效应研究 5
1.2.4 土与支护结构的相互作用研究 6
1.3 本文研究的主要内容 7
第2章 软土中大型深基坑工程实测研究 9
2.1 软土及软土地区基坑工程特点 9
2.2 工程概况 10
2.2.1 工程简介 10
2.2.2 工程地质及水文地质概况 10
2.3 基坑支护设计方案 12
2.4 施工工况 13
2.5 监测点的布设 14
2.5.1 监测控制网的布设 14
2.5.2 浦东工作井监测点的布设 14
2.6 监测作业方法 17
2.6.1 控制测量 17
2.6.2 地下连续墙测斜 18
2.6.3 沉降观测 19
2.6.4 支撑轴力监测 19
2.7 监测结果分析 20
2.7.1 连续墙侧向位移 20
2.7.2 连续墙墙顶沉降 26
2.7.3 格构柱沉降 27
2.7.4 支撑轴力 28
2.7.5 墙后地表沉降 31
2.7.6 建筑物沉降监测 33
2.8 本章小结 34
第3章 基坑开挖有限元分析 36
3.1本构模型 36
3.1.1 支护结构的本构模型 36
3.1.2 土体本构模型 36
3.2土与结构接触单元模型 38-br..
