Date
03 Jun 1988, 10:00 am - 5:30 pm
Abstract
A specialty contractor installed high-capacity pressure-injected footings (PIFs) for foundations in a congested area of an existing coal-fired power plant. Some concrete cylinders broke at strengths significantly lower than the minimum specified strength. Initial coring of some of the PIFs uncovered voids and deleterious matter at the junction of the shaft and the end-bearing base of the PIFs. Subsequent load tests and additional coring substantiated the load-transfer problem. A field testing program was initiated to verify the load-carrying capacity of all the completed PIFs. Wave equation analyses optimized the testing program, established the field testing criteria, and predicted ultimate capacities close to the measured capacities determined from load tests. Load tests also verified the design equation used to control installation of the foundation units. Field testing increased the overall average factor of safety with respect to ultimate capacity.
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
Lewis, M. R. and Blendy, M. M., "Pressure Injected Footings – A Case History" (1988). International Conference on Case Histories in Geotechnical Engineering. 46.
https://scholarsmine.mst.edu/icchge/2icchge/2icchge-session6/46
Pressure Injected Footings – A Case History
A specialty contractor installed high-capacity pressure-injected footings (PIFs) for foundations in a congested area of an existing coal-fired power plant. Some concrete cylinders broke at strengths significantly lower than the minimum specified strength. Initial coring of some of the PIFs uncovered voids and deleterious matter at the junction of the shaft and the end-bearing base of the PIFs. Subsequent load tests and additional coring substantiated the load-transfer problem. A field testing program was initiated to verify the load-carrying capacity of all the completed PIFs. Wave equation analyses optimized the testing program, established the field testing criteria, and predicted ultimate capacities close to the measured capacities determined from load tests. Load tests also verified the design equation used to control installation of the foundation units. Field testing increased the overall average factor of safety with respect to ultimate capacity.
