| Description |
1 online resource (199 pages) |
| Contents |
Intro -- Preface -- Contents -- About the Author -- List of Figures -- List of Tables -- 1 Introduction -- 1.1 Background -- 1.2 Mechanical Properties of Soft Clay Under Cyclic Loading -- 1.3 Physical and Mechanical Properties of Soft Clay Under Freeze-Thaw Cycle -- 1.4 Macroscopic and Microstructural Characteristics of Soft Clay -- References -- 2 Artificial Freezing for by-Pass of Subway Tunnel -- 2.1 Artificial Freezing Method -- 2.2 Design of Freezing Parameters of by-Pass -- 2.2.1 Project Overview -- 2.2.2 Design of Thickness of the Freezing Wall -- 2.2.3 Design of Freezing Holes |
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2.2.4 Design of Average Temperature of Freezing Wall -- 2.2.5 Design of Brine Temperature and Flow Rate -- 2.3 Construction Technology of the Artificial Freezing Method -- 2.3.1 Procedures of the Freezing Construction -- 2.3.2 Technical Parameters of the Freezing Construction -- 2.3.3 Design and Construction of the Emergency Door -- 2.3.4 Attentions for Freezing Construction -- 2.4 Monitoring of the Freezing Engineering -- 2.4.1 Construction Monitoring of Freezing Holes and Freezing Pipes -- 2.4.2 Monitoring of the Frost Heave Pressure -- 2.4.3 Monitoring of the Temperature Field |
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2.4.4 Monitoring of the Deformation -- 2.4.5 Monitoring of the Freezing Equipment -- 2.5 In-Site Monitoring of the Temperature Field -- 2.5.1 Analysis of the Brine Temperature -- 2.5.2 Analysis of the Frozen Soil Temperature -- 2.5.3 Calculation of Thickness and Average Temperature of Freezing Wall -- 2.5.4 Vertical Displacement of Ground Surface During Active Freezing Period -- 2.5.5 Vertical Displacement of Ground Surface Perpendicular to Axial Direction of by-Pass -- 2.5.6 Maximum Deformation and Change Rate of Various Monitoring Projects -- 2.6 Conclusion -- References |
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3 Axial Strain of Silty Clay Before and After Freezing and Thawing -- 3.1 Introduction -- 3.2 Backbone Curve Model -- 3.3 Cyclic Triaxial Tests -- 3.3.1 Sample Preparation and Soil Properties -- 3.3.2 Test Procedures -- 3.4 Analysis of Test Results -- 3.4.1 The Stress-Strain Relationship of Soft Clay in Cyclic Tests -- 3.4.2 Comparison of the Axial Strain Before and After Freezing and Thawing -- 3.4.3 The Development of Excess Pore Pressure -- 3.5 Conclusions -- References -- 4 Freezing-Thawing on Dynamic Characteristics of Silty Clay -- 4.1 Introduction |
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4.2 Definition of Dynamic Modulus and Damping Ratio -- 4.2.1 Definition of Dynamic Modulus -- 4.2.2 Definition of Damping Ratio -- 4.3 Cyclic Triaxial Tests -- 4.3.1 The Schedule of Triaxial Tests -- 4.3.2 The Process of Triaxial Tests -- 4.4 Results Analysis -- 4.4.1 Dynamic Modulus -- 4.4.2 Damping Ratio -- 4.4.3 Excess Pore Water Pressure and Axial Strain -- 4.5 Conclusions -- References -- 5 Microscopic Pore Structures of Silty Clay Before and After Freezing-Thawing by SEM -- 5.1 Introduction -- 5.2 The SEM Test -- 5.3 Test Results -- 5.3.1 Quantitative Analysis of Test Results |
| Summary |
This book addresses development laws for axial strain and excess pore water pressure in silty clay around subway shield tunnels before and after freezing-thawing when subjected to subway loading, as well as the effect of freezing-thawing on the dynamic parameters of silty clay, including the dynamic modulus and damping ratio, introducing readers to the design and construction of bypasses in subway tunnels with the artificial freezing method. On this basis, it then studies the microstructures of silty clay before and after freezing-thawing cyclic loading by means of scanning electron microscope tests and mercury intrusion porosimetry tests. Lastly, the book presents a numerical simulation of the dynamics of silty clay around subway tunnels before and after thawing. Given its scope, it offers a valuable reference guide for construction researchers and designers alike, as well as senior undergraduate and graduate students at colleges and universities |
| Bibliography |
Includes bibliographical references |
| Notes |
Print version record |
| Subject |
Soil freezing.
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Earth sciences.
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Civil engineering, surveying & building.
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Science -- Earth Sciences -- General.
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Technology & Engineering -- Civil -- General.
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Soil freezing
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| Form |
Electronic book
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| Author |
Zhang, Zhong-Liang
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Zhan, Zhi-Xiang
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He, Peng-Peng
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Hou, Chen-Yu
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Zhang, Yan-Kun
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| ISBN |
9789811543425 |
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9811543429 |
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