Advances in Geotechnical Engineering & Geoenvironmental Engineering: Proceedings of the 6th GeoChina International Conference on Civil & Transportation Infrastructures: From Engineering to Smart & Green Life Cycle Solutions -- Nanchang, China, 2021

This book includes a collection of researches that contains research data, discussions and conclusions focusing on several related geotechnical aspects of infrastructure. Topics include issues related to civil infrastructure such as temperature-induced lateral earth pressure on bridge abutment, subsidence of high speed rail and expressway, application of recycled rubber mats, railway ballast evaluation, hurricane protection floodwall, tunnel portal stability, deep excavation case study and properties of contaminated soils. Various types of research were used in the various studies, including field measurements, numerical analyses and laboratory measurements. This findings and results should lead to more resilient infrastructure design, maintenance and management, which will provide benefits to both civil engineering practitioners, researchers and students Introduction 6 Contents 7 About the Editors 9 Response of Approach to Integral Abutment Bridge Under Cyclic Thermal Movement 11 1 Introduction 11 2 Experimental Programme 14 2.1 Model Tank and Backfill Soil 14 2.2 Instrumentation 15 2.3 Test Procedure 16 3 Results and Discussion 16 4 Conclusion 24 References 26 Numerical Assessment on the Influence of Various Factors for Subsidence at the Intersection of Expwy 78 and High Speed Rail of Taiwan 28 1 Subsidence Issue 29 2 Background Information 33 2.1 Geology and Hydrogeology 33 2.2 Previous Overpumping 34 2.3 Expwy 78 and THSR Construction Histories 35 3 Numerical Simulation Scheme 36 4 Numerical Assessment Results 37 4.1 Contributions of Various Factors on Ground Subsidence 37 4.2 Influence of Soil Creeping on Compression of Soils 39 4.3 Influence of Overpumping on Compression of Soils 40 4.4 Influence of Expwy 78 Loading on Compression of Soils 40 4.5 Influence of THSR Loading on Compression of Soils 41 4.6 Influence of GWT Fluctuation on Compression of Soils 43 5 Concluding Remarks 43 References 45 Application of Recycled Rubber Mats for Improved Performance of Ballasted Tracks 47 1 Introduction 47 2 Large-Scale Triaxial Cyclic Tests 48 2.1 Sample Preparation and Testing Procedure 48 3 Discrete Element Modeling 50 3.1 Coupled DEM-FEM 50 3.2 Predicted Stress-Strain Behaviour of Ballast 52 3.3 Simulated Ballast Breakage 53 3.4 Contact Force Distributions 54 4 Conclusions 55 References 55 Appraisal of Railway Ballast Degradation Through Los Angeles Abrasion, Cyclic Loading Tests, and Image Technics 58 1 Introduction 58 2 Material and Methods 59 2.1 Material 59 2.2 Methods 60 3 Results and Discussion 61 3.1 Degradation 61 3.2 Imaging Assessment 64 4 Conclusion 66 References 67 Design and Analyses of the Hurricane Protection Floodwall in South Louisiana 69 1 Introduction 69 2 General Subsurface Profile 70 3 Floodwall 71 4 Finite Element Model 71 4.1 Model Configurations 71 4.2 Lateral Pile Load Test 72 5 Soil Structure Interaction 73 5.1 Pile-Soil Interaction 73 5.2 Active Pore Pressures 74 5.3 Model Results 74 6 Seepage Cutoff 75 7 Settlement Analyses 76 7.1 Consolidation Model 76 7.2 Consolidation Calculations 76 8 Stability of Rock Berm 77 8.1 Deep-Seated Soil Failure Below Rock Dike. 77 8.2 Soil Cut-Off Structures 78 9 Conclusions 79 References 79 Study on Stability of Tunnel Portal Section Based on Strength Reduction Shortest Path Method 81 1 Introduction 81 2 Strength Reduction Shortest Path Method 82 2.1 Reduction Mechanism 82 2.2 Definition of the Overall Safety Factor 83 3 3D Model Establishment and Result Analysis 84 4 Influence of Strength Parameters on Stability of Surrounding Rock at the Tunnel Portal 90 4.1 Influence of Initial Internal Friction Angle 90 4.2 Influence of Initial Cohesion 95 5 Conclusion 98 References 100 Lessons and Mitigation Measures Learned from One Deep Excavation Failure Case 102 1 Introduction 102 2 Project Overview 103 2.1 Geology and Ground Condition 104 2.2 Original Excavation Design Scheme 104 3 Excavation Failure Process and Forensic Studies 106 3.1 Excavation Failure Process 106 3.2 Field Investigation and Testing 107 3.3 Forensic Studies and Discussions for the Excavation Failure 107 4 Re-checking Calculation and Mitigation Design 111 5 Concluding Remarks 113 References 114 Analysis of Dielectric Properties and Influencing Factors of Zn Contaminated Soil 115 1 Introduction 115 2 Test Method and Results 116 2.1 Test Method 116 2.2 Test Result 117 2.3 Grey Correlation Analysis 118 3 Mechanism Analysis of Complex Permittivity Variation 119 3.1 Basic Principles 119 3.2 Influence Mechanism of Frequency on Dielectric Properties 120 3.3 Influence Mechanism of Different Factors on Dielectric Properties 120 4 Conclusion 122 References 123 Author Index 125