声明
摘要
Acknowledgment
Contents
List of Figures
List of Tables
Chapter 1 Introduction
1．1 Research Background
1．2 Present Research Situation
1．2．1 Fundamental Equation and Numerical Simulation of Seepage
1．2．2 Numerical calculation theory of fluid-solid coupling
1．2．3 Testing Research of Hydrofracturing
1．2．4 Current Status of Numerical Analysis of Hydraulic Fracturing
1．3 Research Content，Innovation and Research Route
1．3．1 Research Contents
1．3．2 Innovation
1．3．3 Research Route
Chapter 2 Hydraulic-Mechanical Coupled Properties of Rock Specimens with Penetrating Fractures
2．1 Preparation of Crack Propagation Test
2．1．1 The Process of Specimen Fabrication
2．1．2 Design of Sealing Device
2．1．3 Injection Equipment
2．1．4 Test Preparation Process
2．1．5 Loading Equipment
2．2 Procedure of Test
2．3 Fracture Condition of Single Fracture Specimens under Different Axial Pressures with Water Pressure Inside
2．3．1 Cracking and Failure Modes
2．3．2 Analysis of Stress-Strain Relationship of Rock Specimens with Penetrating Cracks and Water Pressure Inside
2．3．3 States Comparison Between Specimens with or without Hydraulic Pressure
2．4 Cracking of Single-Crack Specimens under Hydraulic Pressure
2．4．1 Hydrofracturing of Specimen without Confining Pressure
2．4．2 Effect of Confining Stress Difference on Hydrofracturing Initiation
2．4．3 Effect of Water Pressure Loading Rate on Hydrofracturing Initiation
2．5 Conclusions
Chapter 3 Non-Darcy Flow Characteristics of the Beadpack Medium
3．1 Introduction of OpenFOAM
3．2 Establishment of Model
3．3 Calculation Conditions and Parameters
3．4 Analysis of Calculation Results
3．4．1 Permeability in Darcy Flow
3．4．2 Status of Non-Darcy Flow
3．4．3 Flow Mode
3．5 Discussion on the β Factor
3．6 Conclusions
Chapter 4 Characteristics of Non-Darcy Flow in Sandstone and Carbonate
4．1 Establishment of Models
4．2 Discussion of the Calculation Resuits
4．2．1 State of Darcy Flow and Non-Darcy Flow
4．2．2 Critical Reynolds Number
4．2．3 Flow Characteristics
4．2．4 Calculation of β Factor
4．2．5 Sensitivity Analysis of Grids Size
4．3 Conclusions
Chapter 5 Coupled Calculation Method of Seepage Stress Based on DDARF
5．1 Basic Principles of DDA Method
5．1．1 Deformation and Displacement of Blocks
5．1．2 Equilibrium Equation of Blocks
5．1．3 Solution and Iteration of Equation
5．2 Introduction of DDARF
5．2．1 Automatic Generation of Random Joint Networks
5．2．2 Automatic Generation of Triangular Block Elements
5．2．3 Simulation of Non-Uniformitv of Materials
5．2．4 Analysis Method of Block Boundary Cracking
5．3 Establishment of DDARF Multiscale Grid
5．3．1 Introduction of HyperMesh
5．3．2 Transformation of Multiscale Grid
5．3．3 Uniaxial Fracturing Numerical Test
5．3．4 Shearing Numerical Test
5．4 A Method of Coupled Hydraulic-Mechanical Model under Non-Darcy Flow Conditions
5．4．1 Determination of Crack Aperture
5．4．2 Fluid Pressure Calculation
5．4．3 Calculation of Head Pressure Loading Applying on Cracks
5．5 Conclusions
Chapter 6 DDARF Simulation of Specimens under Hydraulic Pressure
6．1 Conditions of Calculation
6．2 Model and Mechanical Parameters
6．3 Uniaxial Fracturing Process of Specimens under Different Hydraulic Pressures
6．3．1 Establishment of Numerical Model
6．3．2 Setting of Computational Working Conditions
6．3．3 Numerical Tbst
6．4 Numerical Simulation of Hydraulic Fracturing Based on DDAFR
6．4．1 Effect of Non-Darcy Flow on Crack Propagation
6．4．2 Simulation of Specimens under Different Confining Stresses
6．4．3 Simulation of Specimens under Different Hydraulic Loading Rates
6．4．4 Effect of Water Pressure Loading Rate on Hydraulic Fracturing
6．5 Application of Calculation
6．5．1 Models and Parameters of Calculation
6．5．2 Analysis of Calculation Results
6．6 Conclusions
Chapter 7 Conclusions and Recommendations
7．1 Conclusions
7．2 Recommendations
Appendix Chinese Edition
第一章绪论
1．1选题背景和研究意义
1．2国内外研究现状
1．3本文研究内容、创新点及技术路线
第二章含贯穿裂隙类岩石试件水力耦合力学性能研究
2．1二维裂纹扩展试验准备过程
2．2试验步骤
2．3水压作用下单裂隙试件在不同轴压情况下的开裂情况
2．4水压作用下单裂隙试件的开裂情况
2．5本章小结
第三章珠粒多孔介质非均质性的非达西流动特性
3．1 OpenFOAM简介
3．2模型的建立
3．3计算条件及参数设定
3．4计算结果分析
3．5 β因子的讨论
3．6本章小结
第四章砂岩与碳酸盐岩介质非达西流特征
4．1模型的建立
4．2计算结果讨论
4．3本章小结
第五章基于非连续变形的渗流应力耦合计算方法
5．1 DDA方法的基本原理
5．2 DDARF程序的介绍
5．3 DDARF多尺度网格的建立
5．4达西-非达西流条件下耦合水力-械模型的方法
5．5本章小结
第六章水压作用下内置单裂隙试件的DDARF模拟
6．1计算条件设定
6．2模型和力学参数
6．3不同水压下的试件单轴压裂过程
6．4基于DDARF水压致裂数值模拟
6．5计算实例
6．6本章小结
7．1结论
7．2展望
Reference
Resarch Experiment
Publications
Honors＆Awards
