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Sponsored by ASCE's Geo-Institute's Technical Committees
INSTRUCTORS:
Meeok Kim, Ph.D., P.E.
Harry W. Schnabel, P.E., M.ASCE
Harald P. Ludwig, P.E., Ph.D.
Ahmed Mahgoub, PhD, P.Eng.
Glen R. Andersen, ScD, Ph.D., P.E., A.M.ASCE
Gregory A. Terri, P.E., M.ASCE
Purpose and Background
These presentations were recorded at the 2020 GI Web Conference.
Deconstruction of Existing Basement Structure and Construction of SOE system (21 minutes)
This presentation explores the challenges and engineering solutions involved in deconstructing an existing basement structure while constructing a new support of excavation (SOE) system. The case study focuses on the demolition of a high-rise building in Richmond, Virginia, where an innovative approach was required to ensure the stability of adjacent structures and facilitate a deeper excavation. Key topics include the use of a double earth retention system, tieback installation complexities, structural sequencing considerations, and the impact of soil conditions on excavation methods. The presentation also highlights numerical modeling techniques used to evaluate structural stability during demolition and excavation.
Deflection-Based Design for the Capitol Crossing Excavation Support System (24 minutes)
This presentation discusses a deflection-based design approach used for the excavation support system at the Capitol Crossing project in Washington, D.C. The focus is on understanding the effects of excavation-induced movement on nearby structures, particularly in urban environments with sensitive buildings. The speaker explains traditional design methodologies, the importance of considering soil-structure interaction, and empirical methods for estimating lateral deflections and settlements. Real-world applications from the project demonstrate how deflection control measures, such as soil mix walls and monitoring systems, helped limit building damage and maintain excavation stability.
Multi-Purpose Cofferdam for Lake Manatee Dam Phase II Repairs (26 minutes)
This session presents the design and implementation of a multi-purpose cofferdam used for the rehabilitation of Lake Manatee Dam in Florida. The speaker explains the multiple functions of the cofferdam, including dewatering for structural repairs, seepage control, and stability improvements. The discussion covers the geotechnical challenges, innovative structural solutions such as braced sheet piles and jet grout walls, and the use of finite element modeling to ensure safety. The presentation provides insights into how advanced engineering techniques were employed to reinforce aging dam infrastructure effectively.
Accommodation Variable Subsurface Conditions for Major League Soccer Stadium Excavation Support (41 minutes)
This presentation focuses on the geotechnical and structural challenges encountered during the excavation and earth retention design for a Major League Soccer stadium. The project required a deep excavation in an urban environment, with highly variable subsurface conditions, including unpredictable rock elevations and complex fill materials. The presentation discusses different retention systems, the role of geotechnical investigations in optimizing design, and the impact of soil properties on earth pressures. Case studies from the project illustrate how pre-bid investigations, ground improvement techniques, and real-time monitoring helped ensure excavation stability and project success.
Benefits and Learning Outcomes
Upon completion of this course, you will be able to:
- Describe the challenges and methodologies involved in deconstructing an existing basement structure while implementing a new support of excavation (SOE) system.
- Explain the principles of deflection-based design and its application in minimizing building settlement due to adjacent excavation.
- Identify the engineering considerations and structural components involved in designing a multi-purpose cofferdam for dam infrastructure repairs.
- Discuss the impact of varying subsurface conditions on excavation support system design and the adaptive solutions employed in the construction of a stadium foundation.
Assessment of Learning Outcomes
Students' achievement of the learning outcomes will be assessed via a short post-test assessment (true-false, multiple choice, and/or fill in the blank questions).
Who Should Attend
Structural engineers, geotechnical engineers, civil engineers, construction professionals and geologists.
How to Earn your CEUs/PDHs
To receive your certificate of completion, you will need to complete a short post-test and receive a passing score of 70% or higher within one year of purchasing the course.
How do I convert CEUs to PDHs?
1.0 CEU = 10 PDHs [Example: 0.1 CEU = 1 PDH]