现代高层建筑施工技术论文提纲

论文题目：Analytical and Field Evaluation of Deep Basements and Their Corresponding Heights in High-Rise Buildings for Top-Down Co

摘要：现代社会的发展,尤其是大城市的发展,使得地下室的建设变得重要且必要。地下室结构为城市提供着停车空间和各种公共设施等,然而随着城市对地下空间需求的不断提高,单层地下室已经无法满足人们的需求。由于城市复杂的施工环境和对变形的严格要求,传统的施工方法的适用性较差,自上而下的逆作法施工受到广泛的应用。特别是在有地下室的高层建筑中,地下室结构和上部结构工程可以同时进行,既节省了时间,又提高了安全性。本文依托于南京金茂广场二期工程研究了高层建筑逆作法施工技术。本文旨在为逆作法深基坑支护体系的发展提供完善的设计思路和分析方法,研究的主要内容如下:1.简要概述了逆作法的研究背景和意义、国际上的工程实例、分类原则和基本特点、现行的逆作法施工设计、现场勘察、场地试验和工程应用等。2.逆作法施工的有限元理论研究,包括不同分析阶段的有限元基本原理、土体本构模型、开挖过程的有限元网格划分方法。3.采用PLAXIS 3D进行三维有限元数值模拟,分析了高层建筑土石方开挖和地下室结构及其相应高度的逆作法施工。在基础开挖过程中,研究了上部结构增加额外施工楼层导致支撑、地下连续墙沉降变化的影响;同时,根据不同的施工阶段,对柱桩的受力情况进行了分析。综上,本文对逆作法施工的指导思想进行了分析和总结,以确保施工安全及设计优化,为该项有前途的施工技术提供参考。

关键词：逆作法;高层建筑;深基坑开挖;变形;沉降

学科专业：岩土工程

Acknowledgements

摘要

Abstract

Chapter 1: Background and literature review

1.1 Research background and significance

1.1.1 Research background

1.1.2 Features of Deep Foundation Pit Engineering Project

1.1.3 Definition of Top-Down Construction Method

1.2 Research and Application Status of Top-Down Techniques

1.2.1 International Research and Application

1.2.2 Local Search and Application (China)

1.2.3 Classification of Top-Down Methods

1.2.4 Overview of Top-Down Method

1.3 Research Status of Top-Down Method

1.4 Research Objectives

Chapter 2: Field Investigation Techniques

2.1 The investigation, Drilling, And Sampling

2.1.1 General

2.1.2 Number and depth of borings and in situ tests

2.1.3 Drilling

2.1.4 Sampling

2.1.5 Groundwater Level

2.2 In Situ Tests

2.2.1 Standard Penetration Test(SPT)

2.2.2 Cone Penetration Test(CPT)

2.2.3 Pressuremeter Test (PMT)

2.2.4 Dilatometer Test (DMT)

2.2.5 Vane Shear Test (VST)

2.2.6 Borehole Shear Test (BST)

2.2.7 Plate Load Test

2.2.8 Pocket Penetrometer and Torvane Tests (PPT)

2.2.9 Pocket Erodometer Test (PET)

2.2.10 Compaction Control Tests

2.3 Bi-Directional Static Loading Test to Deep Foundations

2.3.1 Test Method

2.3.2 Test system

2.3.3 Analysis of measured results

Chapter 3: Construction Technology of Top-Down Construction

3.1 Influence of Column Inclination on The Stress of Top-Down Construction Structure

3.1.1 Analysis of Column Bearing Capacity Under Normal Conditions

3.1.2 Calculation Formula of Column's Inclined Bearing Capacity

3.1.3 Mechanism Analysis of Soil Deformation

3.1.4 Calculation theory of earth pressure on supporting structure

3.2 Top-down Construction Technology of Nanjing Jinmao Plaza II project (Case study)

3.3 Project Overview

3.3.1 General Situation of Architecture and Structure

3.4 Engineering geology, hydrological conditions and surrounding environment

3.4.1 Meteorological conditions

3.4.2 Topography and geomorphology

3.4.3 Site Stability and Seismic Effect

3.4.4 Surroundings Environment

3.4.5 Properties of Soil

3.5 Construction Sequence and Construction Process

Chapter 4:Numerical Analysis of Top-Down Construction Method

4.1 Finite Element Formulation

4.1.1 Finite Elements and Nodes

4.2 Project Background

4.2.1 Soil layer

4.2.2 Model Parameters

4.2.3 Details of the structural elements

4.2.4 Mesh generation

4.3 Simulated Stage of Construction

4.4 Analysis of calculation results

4.4.1 Total displacement (Ux,Uy,Uz) in (x,y,z) direction

4.4.2 Horizontal Displacement of Underground Wall

4.4.3 Vertical Displacement of Intermediate Supporting Column

Chapter 5: Conclusions and Future Research

5.1 Conclusions

5.2 Recommendations

References