Location
St. Louis, Missouri
Date
02 Jun 1993, 2:30 pm - 5:00 pm
Abstract
Two of the caissons supporting the 26-story IBM office building were instrumented to evaluate the load transfer mechanism from caissons to the surrounding soil and rock. These drilled shafts extended through loose alluvial stratum, a stratum of dense sands and silts, a disintegrated rock stratum, and were founded in the underlying Amphibolite bedrock. Evaluation of mobilized skin friction and end bearing for one of the caissons are presented in this study. Instrumentation consisted of vibrating wire total load cells and embedded strain gauges. Total load cells were installed at the bottom of the caissons to measure the end bearing pressure. Embedment strain gauges were installed in groups of three in the middle of the general strata and at the approximate level of strata change to evaluate skin friction. In-situ measurements from the gauges were recorded during the construction of the building. From these strain gauge readings load distribution with depth, the average skin friction in each stratum and end bearing pressure were calculated and presented. Finally, these mobilized values were compared with the initial design parameters and the performance of the foundation was evaluated.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
3rd Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1993 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Kesavanathan, S. and Kozera, D. W., "Instrumented Caissons at the IBM Building, Baltimore" (1993). International Conference on Case Histories in Geotechnical Engineering. 35.
https://scholarsmine.mst.edu/icchge/3icchge/3icchge-session07/35
Instrumented Caissons at the IBM Building, Baltimore
St. Louis, Missouri
Two of the caissons supporting the 26-story IBM office building were instrumented to evaluate the load transfer mechanism from caissons to the surrounding soil and rock. These drilled shafts extended through loose alluvial stratum, a stratum of dense sands and silts, a disintegrated rock stratum, and were founded in the underlying Amphibolite bedrock. Evaluation of mobilized skin friction and end bearing for one of the caissons are presented in this study. Instrumentation consisted of vibrating wire total load cells and embedded strain gauges. Total load cells were installed at the bottom of the caissons to measure the end bearing pressure. Embedment strain gauges were installed in groups of three in the middle of the general strata and at the approximate level of strata change to evaluate skin friction. In-situ measurements from the gauges were recorded during the construction of the building. From these strain gauge readings load distribution with depth, the average skin friction in each stratum and end bearing pressure were calculated and presented. Finally, these mobilized values were compared with the initial design parameters and the performance of the foundation was evaluated.
