Proceeding of the 2018 DFI-EFFC International Conference on Deep Foundations and Ground Improvement, Rome, Italy, (DFI, EFFC)
Performance and Analysis of Braced Secant Pile Wall for a Multi-Story Building in Manhattan, NY
James D. Maniscalco, P. E. and Evangelia S. Ieronymaki, Ph.D.
This paper presents a case-study summarizing the construction and performance of a secant pile wall which served as the support of excavation during construction of two below grade basement levels for a multi-story building in Manhattan, NY. The secant pile wall was installed along the perimeter of the proposed building footprint (approximately125 ft by 123 ft) and was designed, along with multiple tiers of internal bracing, to support a 43 foot excavation below the existing ground surface. A 25-story residential building, directly adjacent to the west property line of the proposed building, provided a challenge during the installation of the west secant wall due to its close proximity to drilling equipment and was the main concern for settlement during the excavation. To monitor horizontal movement at the west secant wall during the excavation stages, two inclinometers (one at each corner of the adjacent building) were installed in the secant pile wall. A two dimensional finite element analysis of each stage of the excavation was retroactively performed, using the available soil information, and is compared to the measured inclinometer data obtained during construction.
|article #3013; publication #1040 (ROME-2018)|