基于水—热—力耦合理论的膨胀土场地变形分析
发布时间：2024-02-18 18:32
岩土工程中非饱和土膨胀土隆起变形分析方法主要包括经验法、固结试验法、吸力法和数值法。多物理场耦合分析数值法因具有考虑因素多、处理复杂问题能力强等诸多优势,广泛用于土体多物理场耦合复杂分析的问题中。为了准确分析并预测非饱和膨胀土隆起变形的问题,本文基于水-热-力耦合理论方法,研究并建立求解非饱和膨胀土隆起变形的偏微分方程组与相应的数值模型。据此,开展了如下主要研究工作。(1)采用非饱和土力学理论,考虑基质吸力、土体变形和热对流的耦合作用,建立了非饱和膨胀土水-热-力耦合分析的数学偏微分方程(即:土的变形方程、孔隙水流动方程和温度方程),能够用于分析含水量和温度等不同环境条件变化下非饱和膨胀土膨胀和干燥过程中应力和变形的问题。(2)在多物理场仿真软件COMSOL Multiphysics将非饱和膨胀土水-热-力耦合分析的数学偏微分方程,进行了有限元法数值实现,并通过抽水引起膨胀土场地变形、膨胀土逐渐润湿引起土体变形的实测数据验证了数值模型的正确性,并与水-力耦合理论分析结果进行了对比,得到水-热-力耦合理论分析结果更准确。(3)系统分析了不同边界条件膨胀土的泊松比和温度对膨胀土变形的影响,...
【文章页数】：96 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
List of Acronyms
Chapter 1 Introduction
1.1 Description of the Topic
1.2 Statement of the Problem
1.3 Objectives of the Study
1.4 Outline of the Thesis
1.5 Background of Expansive Clay Soil
1.5.1 Identification of Expansive Soil
1.5.2 Structure of Expansive Clay Soil
1.6 Mechanical Behavior of Expansive Soil
1.6.1 Stress State Variables
1.6.2 Constitutive Relationships
1.7 Literature Review on Heave Prediction Methods
1.7.1 Empirical Methods
1.7.2 Methods Based on Oedometer Tests
1.7.3 Methods Based on Suction Method
1.8 Coupled and Uncoupled Approaches
1.8.1 Coupled Approach
1.8.2 Uncoupled Approach
1.9 Significance of the Research
1.10 Summary
Chapter 2 Theory Framework of the Heave of Expansive Soil Considering CoupledThermo-Hydro-Mechanical Analysis
2.1 Introduction
2.2 Flow Laws for Expansive Soils
2.2.1 Air Flow Law for Expansive Soils
2.2.2 Water Flow Law for Expansive Soils
2.3 Theory of Numerical Modelling
2.3.1 Soil Equilibrium Equation
2.3.2 Water Flow Law
2.3.3 Thermal Flow Law
2.4 Governing Partial Differential Equations
2.4.1 Partial Differential Equation for Soil Deformation
2.4.2 Partial Differential Equation for Water Flow
2.4.3 Partial Differential Equation for Heat Flow
2.5. Finite Element Modeling for Coupled Thermo-Hydro-Mechanical analysis
2.5.1 Strain-Displacement Relationship
2.5.2 Soil Equilibrium Equation Finite Element Formulation
2.5.3 Water and Heat Flow Equation Finite Element Formulation
2.6 Summary
Chapter 3 Verification and Analysis of Numerical Modeling
3.1 Introduction
3.2 Numerical modeling using coupled Hydro-Mechanical Analyses and Coupled Thermo-Hydro-Mechanical Analyses
3.2.1 Computer Program COMSOL Multiphysics 5.3
3.2.2 Cases Presentation
3.3 Verification and Discussion of the Modeling
3.3.1 Results and Discussion for Case 1
3.3.2 Results and Discussion for Case 2
3.4 Summary
Chapter 4 Parametric Study
4.1 Introduction
4.2 Parametric Study Related to the Change of the Poisson’s Ratio in Case1
4.3 Parametric Study Related to the Change of the Boundaries Conditions and thePoisson’s Ratio in Case 2
4.4 Summary
Chapter 5 Conclusions and Future Works
5.1 Conclusions (English)
5.2 Conclusions (Chinese)
5.3 Future Works
References
Acknowledgement
本文编号：3902341
【文章页数】：96 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
List of Acronyms
Chapter 1 Introduction
1.1 Description of the Topic
1.2 Statement of the Problem
1.3 Objectives of the Study
1.4 Outline of the Thesis
1.5 Background of Expansive Clay Soil
1.5.1 Identification of Expansive Soil
1.5.2 Structure of Expansive Clay Soil
1.6 Mechanical Behavior of Expansive Soil
1.6.1 Stress State Variables
1.6.2 Constitutive Relationships
1.7 Literature Review on Heave Prediction Methods
1.7.1 Empirical Methods
1.7.2 Methods Based on Oedometer Tests
1.7.3 Methods Based on Suction Method
1.8 Coupled and Uncoupled Approaches
1.8.1 Coupled Approach
1.8.2 Uncoupled Approach
1.9 Significance of the Research
1.10 Summary
Chapter 2 Theory Framework of the Heave of Expansive Soil Considering CoupledThermo-Hydro-Mechanical Analysis
2.1 Introduction
2.2 Flow Laws for Expansive Soils
2.2.1 Air Flow Law for Expansive Soils
2.2.2 Water Flow Law for Expansive Soils
2.3 Theory of Numerical Modelling
2.3.1 Soil Equilibrium Equation
2.3.2 Water Flow Law
2.3.3 Thermal Flow Law
2.4 Governing Partial Differential Equations
2.4.1 Partial Differential Equation for Soil Deformation
2.4.2 Partial Differential Equation for Water Flow
2.4.3 Partial Differential Equation for Heat Flow
2.5. Finite Element Modeling for Coupled Thermo-Hydro-Mechanical analysis
2.5.1 Strain-Displacement Relationship
2.5.2 Soil Equilibrium Equation Finite Element Formulation
2.5.3 Water and Heat Flow Equation Finite Element Formulation
2.6 Summary
Chapter 3 Verification and Analysis of Numerical Modeling
3.1 Introduction
3.2 Numerical modeling using coupled Hydro-Mechanical Analyses and Coupled Thermo-Hydro-Mechanical Analyses
3.2.1 Computer Program COMSOL Multiphysics 5.3
3.2.2 Cases Presentation
3.3 Verification and Discussion of the Modeling
3.3.1 Results and Discussion for Case 1
3.3.2 Results and Discussion for Case 2
3.4 Summary
Chapter 4 Parametric Study
4.1 Introduction
4.2 Parametric Study Related to the Change of the Poisson’s Ratio in Case1
4.3 Parametric Study Related to the Change of the Boundaries Conditions and thePoisson’s Ratio in Case 2
4.4 Summary
Chapter 5 Conclusions and Future Works
5.1 Conclusions (English)
5.2 Conclusions (Chinese)
5.3 Future Works
References
Acknowledgement
本文编号：3902341
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