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Deep Soil Mixing for Excavation Retention: Ground Improvement Study

This web-based class project from the University of Michigan explores Deep Soil Mixing (DSM) techniques for excavation retention. The report covers concepts, case studies, design considerations, construction methods, and quality control aspects of DSM. Four detailed case studies, including the Milwaukee Lake Parkway, PennDOT Excavation, Boston Central Artery Bird Island Flats, and Museum of Fine Arts Boston Addition, are analyzed with insights on structural support, performance demands, and stability. More information can be found at the provided link.

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Deep Soil Mixing for Excavation Retention: Ground Improvement Study

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  1. Deep Soil Mixing for Retention of Excavations Web-based Class Projecton Ground Improvement Prepared by: Report prepared as part of course CEE 542: Soil and Site Improvement Winter 2014 Semester Instructor: Professor Dimitrios Zekkos Department of Civil and Environmental Engineering University of Michigan Alex Willets Stefano Bruni With the Support of:

  2. More Information More detailed technical information on this project can be found at: http://www.geoengineer.org/education/web-based-class-projects/select-topics-in-ground-improvement

  3. Deep Soil Mixing for Retention of Excavations

  4. Overview Concepts of DSM and SMW • Compile and analyze 4 case studies • Present findings • Analyze trends

  5. Overview • DMM In situ improvement • Technique based on: • Geometry • Type and state of binder • Method of mixing

  6. Overview • Synthesis • High performance demands • Equipment/Method of injection • Design concerns • Structural Support/Reinforcement • State and properties of stabilizers • Success and Quality Control

  7. Background Info • Other wall types Slurry Wall Sheet Pile Wall Lagging Wall Secant Wall

  8. Case Study #1: Lake Parkway Milwaukee

  9. Project Overview • 1000 m long I-794 Extension • Minimize seepage/provide Retention • 75 year design life • Depths 12-18 m • Site conditions • Sand, silt, stiff clay • Water table depths 1m

  10. Design and Construction • Staged Construction • Structural Support • Soldier beams • RC wall • Studs • Tiebacks/walers • High w/c slurry

  11. Results and Quality Control • Cylinder UCS tests met design 0.50 Mpa • K as low as 10m/sec • 25 mm allowable displacement • Surficial crumbling

  12. Case Study #2: PennDOT Excavation

  13. Project Overview • State route 54 tunnel underpass • Historic Mansions 1m from wall • Limit Noise and Vibration • Depths 6.7- 9.4 m • Site Conditions • Dense sands, gravels, silts • Water table at depth

  14. Design and Construction • Complicated design models • continuous wall, sheet pile wall, segmental wall • Structural Support • W18x40 Soldier beams • Pre-stressed horizontal braces • Soldier Pile anchorage

  15. Results and Quality Control • Settlement was below 10 mm • 6 mm post-construction lateral movement • 3.8 MPa UCS from sampling

  16. Case Study #3: Boston Central Artery Bird Island Flats (BIF) Google

  17. Bird Island Flats (BIF) McGinn and O’Rourke, 2000

  18. BIF Plan View O’Rourke and O’Donnell, 1997a

  19. East Wall Soil Profile McGinn and O’Rourke, 2000

  20. Ground Displacements McGinn and O’Rourke, 2000

  21. East Wall Base Stabilization McGinn and O’Rourke, 2000

  22. Reinforcing Buttress McGinn and O’Rourke, 2000

  23. BIF West Wall O’Rourke and O’Donnell, 1997b

  24. West Wall Soil Profile McGinn and O’Rourke, 2000

  25. West Wall Base Stabilization McGinn and O’Rourke, 2000

  26. West Wall Excavation Performance O’Rourke and O’Donnell, 1997b

  27. West Wall Excavation Performance O’Rourke and O’Donnell, 1997b

  28. Deep Rotational Stability O’Rourke and O’Donnell, 1997b

  29. Case Study #4: Museum of Fine Arts (MFA) Boston Addition Foster and Partners

  30. MFA Boston Addition Google

  31. MFA Boston Addition Weatherby and Zywicki, 2012

  32. MFA Soil Profile Weatherby and Zywicki, 2012

  33. Structural SMW Weatherby and Zywicki, 2012

  34. Conclusions • Performance demands • Design concerns • Lateral movement • Settlement • Rotational Instability • Structural support/reinforcement • Proper construction

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