Title Dynamic response and deformation characteristic of saturated soft clay under subway vehicle loading / Yiqun Tang, Jie Zhou, Xingwei Ren, Qi Yang

Published Beijing : Science Press ; Heidelberg : Springer, [2014] ©2014

Table of Contents
1.	Introduction					1
1.1.	Research Status					3
1.1.1.	The Study on Soil Structure					3
1.1.2.	The Study on Vehicle Vibration Loading					3
1.1.3.	Dynamic Response of Vehicle Vibration Load					6
1.1.4.	Dynamic Properties of Soft Clay Soil Under Dynamic Loading					10
1.1.5.	Microstructure of Soft Clay Soil					13
1.1.6.	The Long-Term Settlement of Soft Clay Foundation Under Vehicle Vibration Loading					16
1.2.	Research Content and Methodology					18
1.2.1.	Dynamic Response of Soft Clay Surrounding Subway Tunnel to Subway Traffic Loads					19
1.2.2.	Dynamic Characteristics of Soft Clay Under Subway Vibration Loads					19
1.2.3.	Microstructure Study of Soft Clay Under Subway Vibration Loads					19
1.2.4.	Numerical Simulation					20
1.2.5.	Settlement Prediction of Soil Surrounding Subway Tunnel Under Subway Vibration Loads					20
	References					20
2.	Field-Tests					25
2.1.	Introduction					25
2.2.	Engineering Geology of Soft Soil in Shanghai					26
2.3.	Program Design					28
2.3.1.	Selection of Testing Site					28
2.3.2.	Selection of Testing Instruments					28
2.3.3.	Stratigraphic Section and Instrument Installation					29
2.4.	Results and Analysis					29
2.4.1.	Soil Response Frequency					30
2.4.2.	The Attenuation of Dynamic Response in Perpendicular Direction to Subway Tunnel Axis					32
2.4.3.	The Dynamic Response Development Along the Depth					34
2.4.4.	Development of Pore Pressure					35
2.4.5.	Mechanism Analysis of Pore Pressure Development Under Subway Traffic Loading					36
2.5.	Chapter Summary					38
	References					38
3.	Laboratory Tests					41
3.1.	Introduction					41
3.2.	Pore Pressure Development					42
3.2.1.	Experimental Summary					43
3.2.2.	The Pore Water in Soft Clay					49
3.2.3.	The Pore Water Development Properties					53
3.2.4.	The Pore Water Pressure Attenuation Properties					58
3.2.5.	The Mechanism Analysis of Influence of Subway Vibration Loads on Pore Water Pressure					59
3.3.	Deformation Characteristics of Saturated Soft Soils					60
3.3.1.	Experimental Introduction					61
3.3.2.	The Factors on Deformation Under Cyclic Loads					65
3.3.3.	Summary					70
3.4.	Strength Characteristics of Saturated Soft Soils					71
3.5.	Creep Behavior of Soil Under Cyclic Loading (Tang et al. 2010)					72
3.5.1.	Test Apparatus and Samples					74
3.5.2.	Test Control Parameter and Procedures					74
3.5.3.	Test Procedures					75
3.5.4.	Composition of Clayey Creep Under Cyclic Loading					76
3.5.5.	The Change of Reversible Elastic Strain of Saturated Clay					81
3.5.6.	Variation of Accumulated Plastic Strain of Saturated Clay					83
3.5.7.	Variation of the Residual Pore Water Pressure					85
3.5.8.	Summaries					86
3.6.	Dynamic Stress-Strain Relationships					87
3.7.	Effective Principal Stress Variation					90
3.7.1.	Experimental Introduction					90
3.7.2.	The Variation of Effective Primary Stress with Loading Time					92
3.7.3.	The Variation of Shear Wave Velocity					95
3.8.	Mechanism Analysis					95
3.9.	Chapter Summary					97
	References					98
4.	Research of Microstructure					101
4.1.	Introduction					101
4.2.	Qualitative Analysis					104
4.2.1.	Research Method					106
4.2.2.	Preparation of Samples					107
4.2.3.	Basic Characteristics of the Soil Samples					108
4.2.4.	Qualitative Analysis of Observed Result					109
4.3.	Quantitative Analysis					126
4.3.1.	Research Method					127
4.3.2.	Fractal Parameters of MIP Results					131
4.3.3.	The Characteristics of Pore Variation in Undisturbed Soft Clay During the Process of Mercury Intrusion					132
4.3.4.	The Characteristics of Pore Variation in Undisturbed Soft Clay During the Process of Mercury Extrusion					135
4.3.5.	The Variation of Pore Structure Characteristic Parameters in Saturated Soft Clay Under Vibration Loading					136
4.3.6.	Fractal Model and Fractal Dimension					140
4.4.	Correlation Analysis Between Microstructure and Macroscopic Deformation Properties of Saturated Soft Clay Under Subway Loading					147
4.4.1.	Correlation Analysis of Pore Microstructure Parameter and Macroscopic Force					147
4.4.2.	Correlation Analysis of Pore Microstructure Parameters and Macroscopic Deformation					149
4.5.	Chapter Summary					151
	References					152
5.	Finite Element Modeling					155
5.1.	Introduction					155
5.2.	Finite Element Analysis Software					156
5.2.1.	Numerical Method					156
5.2.2.	The Finite Element Method and ANSYS					156
5.3.	Theoretical Analysis					157
5.3.1.	General Equations of the Dynamic Analysis					158
5.3.2.	Dynamic Finite Element Analysis					161
5.3.3.	Static-Dynamic Analysis of Subway-Soil System					166
5.4.	Simulation of the Dynamic Loading Induced by the Subway Train					169
5.4.1.	Generation Mechanism					170
5.4.2.	Simplified Model for Subway Train					173
5.4.3.	The Simulation of Subway Train Loading					173
5.5.	Model Development					177
5.5.1.	Introduction to the Model					177
5.5.2.	Mesh Generation in FEM Model					179
5.5.3.	Material Parameters					184
5.6.	Viscoelastic Artificial Boundary					184
5.7.	The Time Integral Step					186
5.8.	The Results of Transient Analysis					186
5.9.	Chapter Summary					189
	References					190
6.	Settlement Prediction of Soils Surrounding Subway Tunnel					191
6.1.	Introduction					191
6.2.	Analysis on Subway Tunnel Settlement During Tunneling in Soft Soil					192
6.2.1.	Factors					192
6.2.2.	Scope of Settlement and Settlement Tank					194
6.2.3.	Relationship Between Settlement and Grouting Quantity					195
6.2.4.	Estimation of the Ground Pre-settlement					198
6.2.5.	Summary of Early Settlement's Analysis					200
6.3.	Analysis of Long-Term Settlement of Subway Tunnel in Soft Soil					200
6.3.1.	Factors Affecting Long-Term Settlement of Subway Tunnel in Soft Soil					200
6.3.2.	Mechanism Analysis of Long-Term Additional Settlement in Foundation Caused by Subway Load					202
6.4.	Applications of Gray Prediction Theory in Predicting Long-Term Settlement of Subway Tunnel					203
6.4.1.	Research Backgrounds and Introduction					203
6.4.2.	Methodology of Gray Prediction Theory					206
6.4.3.	Model Checking					209
6.4.4.	Applications of Prediction Model					210
6.4.5.	Discussions and Error Analyses					213
6.5.	Effective Stress Analysis of Long-Term Settlement in Tunnel					219
6.6.	Chapter Summary					221
	References					222
7.	Conclusions and Prospects					225
7.1.	Conclusions					225
7.2.	Prospects for Further Study					228
	Appendix: Major Published Works of the Book Author					229
	Index					239

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Description 1 online resource (xxii, 241 pages) : illustrations (some color) Series Springer environmental science and engineering, 2194-3222 Springer environmental science and engineering. Contents Introduction -- Field test -- Laboratory tests -- Microstructure of soil -- Theoretical analysis and numerical simulation -- Settlement predictions for soil around subway tunnels Summary "Involving several areas of geological engineering, geotechnical engineering and tunnel engineering, this book describes the soft soil deformation characteristics and dynamic responses induced by subway vibration load. Based on field monitoring and laboratory testing data, with both comprehensive micro-and macroanalysis, the authors present dynamic characteristics and deformation settlement of saturated soft clay surrounding subway tunnels using dynamic and static methodology. Mechanism of deformation, failure in microstructure of soft clay soil, dynamic response, macro deformation and settlement are all discussed and analyzed thoroughly and systematically. Some of the research findings in this book have been widely applied by large subway companies and will have broader application prospects in future. All the above make this book a valuable reference not only for technical engineers working in subway design or construction but also for advanced graduate students"--Provided by publisher Bibliography Includes bibliographical references and index Notes Online resource; title from pdf information screen (Ebsco, viewed March 12, 2014) Subject Soil dynamics. Deformations (Mechanics) Clay soils. Subway tunnels. Underground construction. deformation. underground buildings. underground structures. TECHNOLOGY & ENGINEERING -- Civil -- General. Sciences de la terre. Environnement. Clay soils Deformations (Mechanics) Soil dynamics Subway tunnels Underground construction Form Electronic book Author Tang, Yiqun, author Zhou, Jie, author Ren, Xingwei, author Yang, Qi, author LC no. 2013957571 ISBN 9783642419874 3642419879 9781306542319 1306542316

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