Earth Retention System in Urban Setting and Its Performance Design-PPT Presentation

PPT Presentation

Pdf Summary

The presentation, <strong>“Earth Retention System in Urban Setting and Performance Design”</strong> by Meeok Kim (July 2022), examines how earth retention systems support deep urban excavations while protecting nearby buildings, property, and underground utilities.

Earth retention systems may be called temporary earth retention systems, support-of-excavation systems, or shoring systems. Their design must address both <strong>strength</strong> and <strong>serviceability</strong>. Strength checks include geotechnical failures such as global instability, sliding, bearing failure, heave, and pullout; water-related risks such as piping and excessive hydraulic gradients; and structural or connection failure. Serviceability focuses on limiting wall movement, ground settlement, vibration, and water leakage, while controlling groundwater during excavation.

The presentation notes that settlement is related to lateral wall displacement, with the relationship varying according to wall deformation shape. It also emphasizes that soil response depends on confinement, strain and loading conditions, water interaction, and stress history. Because soil and structures interact, performance design should account for soil–structure interaction (SSI), using analytical or numerical methods.

For reliable performance predictions, the presentation recommends combining SSI analysis with <strong>staging analysis</strong>, which represents the sequence of excavation and construction. Case-study material includes flood barriers, stacked-tube dams, water flow through soil, and several types of excavation support. One example compares predicted and observed sheet-pile displacement, illustrating the importance of performance-based assessment.

Keywords

earth retention system

urban excavation

shoring systems

soil-structure interaction

serviceability

strength design

groundwater control

wall displacement

staging analysis

performance design