Location
St. Louis, Missouri
Date
02 Jun 1993, 2:30 pm - 5:00 pm
Abstract
A new Combined Sewage Overflow (CSO) basin was constructed in Saginaw, Michigan. The project required an 8.5 foot (2.6 m) diameter connecting sewer to be constructed under a 12 foot (3.7 m) high stockpile of spoil from the excavation for basin. The soil profile at the site contained a 32 foot (9 .8 m) thick layer of compressible organic silt. Since the weight of the stockpile was anticipated to cause settlement of the sewer, a surcharge was placed to preconsolidate the organic silt prior to construction of the sewer. Analysis indicated prefabricated vertical (PV) drains would be required to achieve the desired consolidation within a period of about 3 months. PV drains were installed under the 12 foot (3.7 m) high stockpile with an additional 12 foot (3.7 m) high surcharge. Remote settlement gauges and piezometers were installed to monitor the surcharge. Actual measured settlements of the surcharge indicated the required consolidation occurred approximately 3 times faster than anticipated.
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
Bedenis, T. H., "Surcharging of Organic Silt Using Prefabricated Vertical Drains" (1993). International Conference on Case Histories in Geotechnical Engineering. 27.
https://scholarsmine.mst.edu/icchge/3icchge/3icchge-session07/27
Surcharging of Organic Silt Using Prefabricated Vertical Drains
St. Louis, Missouri
A new Combined Sewage Overflow (CSO) basin was constructed in Saginaw, Michigan. The project required an 8.5 foot (2.6 m) diameter connecting sewer to be constructed under a 12 foot (3.7 m) high stockpile of spoil from the excavation for basin. The soil profile at the site contained a 32 foot (9 .8 m) thick layer of compressible organic silt. Since the weight of the stockpile was anticipated to cause settlement of the sewer, a surcharge was placed to preconsolidate the organic silt prior to construction of the sewer. Analysis indicated prefabricated vertical (PV) drains would be required to achieve the desired consolidation within a period of about 3 months. PV drains were installed under the 12 foot (3.7 m) high stockpile with an additional 12 foot (3.7 m) high surcharge. Remote settlement gauges and piezometers were installed to monitor the surcharge. Actual measured settlements of the surcharge indicated the required consolidation occurred approximately 3 times faster than anticipated.
