Date
03 Jun 1988, 10:00 am - 5:30 pm
Abstract
Inspection of the execution of cast-in-place piles indicated that the pile borings had not been deep enough to reach an underlying adequate bearing layer of rock. Hence, the piles would transmit their end bearing loadings through intermediate soil layers of variable thickness, which could result in differential settlement and damage to the structure. As a remedial measure, the piles were drilled with an air hammer, and thick cement grout injected below the pile tips. Monitoring of the execution of the grouting program indicated that it was both necessary and beneficial. As a final check, a test shaft was excavated alongside a typical pile, and allowed an inspection of the effect of grouting on the foundation strata. Overall conclusions were that the grouting program had succeeded in strengthening the foundation system satisfactorily.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
2nd Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1988 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
Zeitlen, J. G., "Stiffening Cast-in-Place Piling by Bottom Grouting" (1988). International Conference on Case Histories in Geotechnical Engineering. 61.
https://scholarsmine.mst.edu/icchge/2icchge/2icchge-session6/61
Stiffening Cast-in-Place Piling by Bottom Grouting
Inspection of the execution of cast-in-place piles indicated that the pile borings had not been deep enough to reach an underlying adequate bearing layer of rock. Hence, the piles would transmit their end bearing loadings through intermediate soil layers of variable thickness, which could result in differential settlement and damage to the structure. As a remedial measure, the piles were drilled with an air hammer, and thick cement grout injected below the pile tips. Monitoring of the execution of the grouting program indicated that it was both necessary and beneficial. As a final check, a test shaft was excavated alongside a typical pile, and allowed an inspection of the effect of grouting on the foundation strata. Overall conclusions were that the grouting program had succeeded in strengthening the foundation system satisfactorily.
