OasisLMS

Abstract: Challenges with protecting adjacent structures require careful consideration during all aspects of excavation support, including the installation, enabling systems, and the primary support of excavation (SOE). This paper examines a deep excavation in a dense urban environment where a reinforced concrete diaphragm “ slurry” wall with internal bracing facilitated below-grade construction to depths of 25 to 45 feet. Proximity to sensitive structures, including a nearby transit tunnel and historic masonry buildings, heightened the complexity of the project. Finite element modeling (PLAXIS 2D) was employed to predict excavation-induced movements of both the SOE and adjacent structures, and extensive monitoring ensured that adjacent structures remained within allowable tolerances. While the primary SOE performed as anticipated, enabling work and wall installation resulted in movements of adjacent structures and had not been considered when setting allowable movement tolerances. This case study underscores the critical importance of integrating enabling and installation-induced effects into design and planning. The paper demonstrates the value of robust analysis, monitoring, and adaptive measures in managing the challenges of urban excavation.

Mr. Tyler M Poggiogalle; Mr. DAMIAN R SIEBERT

Annual Conference Proceedings