能源桩热-力耦合特性的数值模拟研究

摘要

为高能源价格和气候变化危机是主要考虑的因素，这使得地热能源基础越来越受欢迎。高能源主要和气候变化相关。地热能源桩基础被认为是可再生环境友好的能源供应系统和节约的有利替代技术。
　　能量桩可以作为支撑建筑的基础，也可以作为地面能源资源满足建筑的需求。桩身和周围土体的温度变化会影响影响自身的热力学，无论是结构上的还是岩土工程上的。
　　本文通过对比数值分析与全尺度的试验结果，分析了夏季能量桩基础的热响应。对不同管道结构、不同管径以及管内不同流体速度的能量桩进行了数值模拟，研究了能量桩基础的热力学行为。
　　与全尺寸现场试验结果的对比验证了模型的可行性。分析可知，较单U形和W形管道系统而言，双U形管道系统能够提供最佳的热性能，W型管道系统的热性能优于具有相同流体速度的单U形管道系统。

目录

声明

ACKNOWLEDGEMENTS

ABSTRACT

摘要

NOMENCLATURE

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

1．INTRODUCTION

1．1．General remark

1．2．The objeetive of the thesis

2．LITERATURE REⅥEW

2．1．Thermomeehanieal behavior of soils and energy piles

2．2．Experiment of thermomechanical behavior of energy piles

2．3．Numerical investigation of behavior of energy piles

3．MATHEMATICAL FORMULATION

3．1．Heat transfer in porous media

3．2．Heat transfer in pipes

3．3．Governing equations of stress

3．3．1．Equilibrium equation of stress tension

3．3．2．Incremental stress and strain equation

4．MODEL RESPONSE AND VALIDATION

4．1．Finite element of thermal-hydro-mechanical modeling

4．1．1．Material properties

4．1．2．Initial value eonditions

4．1．3．Boundary conditions

4．1．4．Mesh

4．2．Validation results

4．2．1．Fluid temperature

4．2．2．Axial distribution temperature

4．2．3．Thermal axial vertical stress

4．2．4．Thermal axial displacement

5． NUMERICAL INVESTIGATION OF A FULL-SCALE IN-SITU TEST

5．1．Experimental site

5．2．Finite element of thermal-mechanical modeling

5．2．1．Material properties

5．2．2．Initial value conditions

5．2．3．Boundary conditions

5．2．4．Meshing

5．3．RESULTS AND DISCUSSION

5．3．1．Comparison the numerical analysis results with the full-scaletest results

5．3．2．Influence of the tube configurations

5．3．3．Influence of diameter of the pipes

5．3．4．Influence of velocity of the fluid

6．CONCLUSION

6．1．Conclusion remarks

6．2．Suggestion for future research

REFERENCES

Declaration

THESIS DATA FORM

AUTHoR CURRICULUM VITAE