Location
St. Louis, Missouri
Date
03 Jun 1993, 10:30 am - 12:30 pm
Abstract
An instrumented deep excavation in weathered rock adjacent to a deflection-sensitive historical building is described. Two permanent shoring systems were used, presenting an opportunity to measure and compare their behaviors. Adjacent to the historic structure, a tied-back drilled pier wall was used, while the remainder of the excavation was supported by a tied-back shotcrete wall constructed in top-down fashion. Instrumentation included inclinometers, tiltmeters, and tieback load cells, supplemented by optical surveys. Both support systems performed well, with movements within acceptable ranges. The maximum horizontal deflection of the drilled piers was 0.33 inch (8 mm), one-third to one-fifth that of the shotcrete. Settlements behind the drilled piers were significantly less than behind the shotcrete. Isolated minor cracking and widening of existing cracks occurred in the existing building. Tieback load cell data indicate that the source of movements can extend beyond the theoretical failure wedge.
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
McRae, M. T.; Kishnani, S. S.; and Burton, J. C., "Measured Behavior of a Deep Excavation in Weathered Rock" (1993). International Conference on Case Histories in Geotechnical Engineering. 33.
https://scholarsmine.mst.edu/icchge/3icchge/3icchge-session05/33
Measured Behavior of a Deep Excavation in Weathered Rock
St. Louis, Missouri
An instrumented deep excavation in weathered rock adjacent to a deflection-sensitive historical building is described. Two permanent shoring systems were used, presenting an opportunity to measure and compare their behaviors. Adjacent to the historic structure, a tied-back drilled pier wall was used, while the remainder of the excavation was supported by a tied-back shotcrete wall constructed in top-down fashion. Instrumentation included inclinometers, tiltmeters, and tieback load cells, supplemented by optical surveys. Both support systems performed well, with movements within acceptable ranges. The maximum horizontal deflection of the drilled piers was 0.33 inch (8 mm), one-third to one-fifth that of the shotcrete. Settlements behind the drilled piers were significantly less than behind the shotcrete. Isolated minor cracking and widening of existing cracks occurred in the existing building. Tieback load cell data indicate that the source of movements can extend beyond the theoretical failure wedge.
