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Design and Construction of Subgrades in Poor, Wet, and/or Saturated Soil Conditions Tutorial


 









Design and Construction of Subgrades in Poor, Wet, and/or Saturated Soil Conditions Tutorial

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Index Design and Construction of Subgrades in Poor, Wet, and/or Saturated Soil Conditions Tutorial


Special Practices for Design and Construction of Subgrades in Poor, Wet, and/or Saturated Soil Conditions
Technical Report Documentation Page
TABLE OF CONTENTS
CHAPTER 1: INTRODUCTION
Background
Project Summary
Traditional Subgrade Enhancement Choices
Drainage
Subgrade (Embankment) Soil Construction
Specifications
General Design Considerations
Construction Notes and Procedures
Subgrade Enhancement
Subgrade Soil Enhancement Procedures for Natural Soils
Drainage
Soil Compaction
Soil Modification
Soil Stabilization
Geosynthetics
Substitution
CHAPTER 2: SUBGRADE ENHANCEMENT PROCEDURES USED IN MINNESOTA
General
Questionnaire
Development
Reply Summaries
Visits to Individual Agencies
Summary of Applications
Agencies visited and procedures used
Database developed with location of projects
Variables
Database Setup (Appendix C, Appendix D)
CHAPTER 3: BEST PRACTICE SUMMARIES FOR SPECIAL SUBGRADE
ENHANCEMENT PROCEDURES IN MINNESOTA
Introduction
Natural Soils
Specifications
General Design Considerations
Construction Notes and Procedures
Drying/Modification/Stabilization
Drying/Modification with Lime
Stabilization Using Fly Ash
Geosynthetics
Separation geofabrics
Reinforcement geogrids
Substitution
Select Granular
Breaker Run Limestone
Wood Chips
Shredded Tires
CHAPTER 4: RECOMMENDATIONS
Recommendations
REFERENCES
APPENDIX A: AGENCY QUESTIONNAIRES
Questionnaire on Existing Projects and Practices
APPENDIX B: AGENCY RESPONSES TO QUESTIONNAIRES
Question 1: Modification:
Question 2: Stabilization
Question 3: Reinforcement
Question 4: Substitution
Question 5: Are there any other types of construction which you feel would fit into thescope of this project?
APPENDIX C: AGENCY INTERVIEWS CONDUCTED
DURING SUMMER, 2002
APPENDIX D: MINNESOTA SUBGRADE ENHANCEMENT INSTALLATION
LOCATIONS
Modification and Stabilization Installations
Separation Installations
Reinforcement Installations
Substitution Installations
APPENDIX E: PHOTOS
LIST OF FIGURES
Common Geosynthetics
Examples of Types of Geogrids
Sequence of Construction
Fill placement sequence on soft foundations
Fill placement on foundation with no mudwave
Frost heave resulting from ice lenses 6-in
Bulldozer spreading Lumber-Mill Sawdust
Wood Chips above Geofabric
Tire shreds encapsulated in geofagric
Tire Shreds
Placing tire shreds
Loader distributing and compacting tire shreds
LIST OF TABLES
Methods for incorporating water prior to compaction
Limitations and Safety Precautions for Lime and Fly Ash Modification
Approximate strength values resulting from fly-ash modification
Limitations and Safety Precautions for Asphalt Treatment
Approximate (Resilient Modulus) for Stabilized Pavement Materials
Cement Stabilization Requirements for Various Soils
Criteria for Soil-Cement by Wet-Dry and Freeze-Thaw Durability Tests
Summary of some properties of cement stabilized soil
Limitations and Safety Precautions for Cement and Fly Ash Stabilization
Structural Coefficients for Fly Ash Stabilized Materials
Total transverse and longitudinal cracks at 6 years
Mn/DOT Geosynthetic Classification (Spec 3733)
Typical Values of Transmissivity (In-Plane) of Geotextile
Characteristics of Common Lightweight Fill Materials
Advantages, Disadvantages of Common Lightweight Fill Materials
Characteristics of Common Lightweight Fill Materials
Expanded Polystyrene Foam (EPS)
Summary of Subgrade Enhancement Procedures, MN Counties/Cities
Breaker-Run Limestone and MnDOT Class 5 Gradations
Typical costs of Wood Chips
Subgrade Soil Enhancement Flow Chart
Subgrade Soil Enhancement Flow Chart
Subgrade Soil Enhancement Flow Chart
Subgrade Soil Enhancement Flow Chart







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