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内容大纲
本书主要研究了缺级配土渗透破坏的机理。利用新开发的渗透破坏实验仪，在室内进行了一系统模型试验，重现了向上渗流过程中的渗透破坏过程，探索了颗粒组成、孔隙性、应力状态等对渗透破坏规律（包括破坏临界条件、侵蚀过程等）的影响规律。并基于得到的渗透破坏机理，建立了融合质量守恒与侵蚀规律的管涌过程精细模拟模模型。本书共分为六章。第一章概述了研究现状与研究内容；第二章介绍了研究方法与实验设备；第三、四章系统总结了间隙级配土的渗流破坏规律与破坏机理；最后两章着重阐述了数值模型的构建及其在非均质含水层渗流研究中的应用。 -
作者介绍
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目录
Chapter 1 Introduction
1.1 Background
1.2 Recent developments
1.2.1 Critical condition
1.2.2 Model test
1.2.3 Numerical model
1.3 Key problems
1.4 Key contents
Chapter 2 Test system and method
2.1 Introduction
2.2 Erosion-seepage-stress coupling test system
2.2.1 Test apparatus
2.2.2 Soil specimen preparation
2.2.3 Test procedure
2.3 Inclined seepage test system
2.3.1 Test apparatus
2.3.2 Soil specimen preparation
2.3.3 Test procedure
2.4 Particle migration test system
2.4.1 Test apparatus
2.4.2 Soil specimen preparation
2.4.3 Test procedure
2.5 Velocity-direction detection system
2.5.1 Test apparatus
2.5.2 Test procedure
2.6 Meso-test system of hydraulic erosion based on dual light source PIV/PTV
2.6.1 Test apparatus
2.6.2 Soil specimen preparation
2.6.3 Test procedure
2.7 Summary
Chapter 3 Seepage failure characteristics of gap-graded soil
3.1 Introduction
3.2 Experimental design scheme
3.3 Influencing factors of erosion in gap-graded soil
3.3.1 Critical hydraulic gradient
3.3.2 PSDs
3.3.3 Dry density
3.3.4 Summary and analysis
3.4 Erosion characteristics of gap-graded soil under complex stress
3.4.1 Suffusion processes of gap-graded soil
3.4.2 Erosion characteristics of gap-graded soil
3.4.3 Volume change law of gap-graded soil
3.4.4 Summary and analysis
3.5 Seepage characteristics of gap-graded soil under complex stress
3.5.1 Seepage velocity
3.5.2 Critical hydraulic gradient
3.5.3 Stress states
3.5.4 Summary and analysis
3.6 Influence of seepage direction on piping development of gap-graded soil
3.7 Summary
Chapter 4 Characteristics of erosion-seepage-stress coupling in piping of gap-graded soil
4.1 Introduction
4.2 Intensity variation in piping process of gap-graded soil
4.2.1 Effect of stress state on erosion-strength
4.2.2 Effect of particle size on erosion-strength
4.2.3 Effect of compactness on erosion-strength
4.3 Coupling law of erosion intensity and stress state of gap-graded soil
4.4 Summary
Chapter 5 Mathematical model
5.1 Introduction
5.2 Establishment of piping two-fluid model
5.2.1 Parameter definition
5.2.2 Continuity equation
5.2.3 Equation of motion
5.2.4 Fluid-structure coupling function
5.3 Solution of piping two-fluid model
5.3.1 Fundamentals of Finite Volume Method
5.3.2 Solution of liquid phase motion
5.3.3 Solving solid phase motion
5.3.4 Boundary processing and solution
5.4 An auto-adaptive moving mesh method
5.4.1 Resume
5.4.2 FM generating
5.4.3 Discretization of governing PDE
5.4.4 Erosion law and parameters updating
5.4.5 Stepwise solving of the coupled equations
5.5 Summary
Chapter 6 Backward erosion piping in heterogeneous fields
6.1 Introduction
6.2 Synthetic heterogeneous field
6.2.1 Study domain
6.2.2 Random fields
6.2.3 Generating random fields
6.2.4 Realization of random fields
6.3 Solution of the BEP simulation
6.4 Effects of spatial variability
6.4.1 Monte-Carlo simulation
6.4.2 Results of Monte-Carlo simulations
6.5 Mechanism of heterogeneity effects on seepage instability
6.6 Application of seepage instability evaluation
6.7 Summary
References
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