Location

St. Louis, Missouri

Session Start Date

6-1-1993

Abstract

Storage tanks for a wastewater treatment plant were stage-loaded on weak compressible fine-grained soils. The in situ silt and sand layers/pockets present in the fine-grained soils were theorized to create sufficient drainage paths, so that the use of sand or wick drains were not required. Although the silt and sand layers/pockets were found to be discontinuous, "hydraulic fracturing" was expected to develop continuous drainage paths. A review of the extensive field investigation and geotechnical optimization of the site is presented. Details for the evaluation of the shear strength of the soils, the stage loading schedule and predicted settlements during loading are described. Settlement of the tank foundations and some measurement of the pore pressures were monitored in the field and the data obtained, presented herein, was found to be fairly consistent with the geotechnical analysis results.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Third Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1993

Document Version

Final Version

Rights

© 1993 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Jun 1st, 12:00 AM

Preloading Wastewater Treatment Plant Tanks

St. Louis, Missouri

Storage tanks for a wastewater treatment plant were stage-loaded on weak compressible fine-grained soils. The in situ silt and sand layers/pockets present in the fine-grained soils were theorized to create sufficient drainage paths, so that the use of sand or wick drains were not required. Although the silt and sand layers/pockets were found to be discontinuous, "hydraulic fracturing" was expected to develop continuous drainage paths. A review of the extensive field investigation and geotechnical optimization of the site is presented. Details for the evaluation of the shear strength of the soils, the stage loading schedule and predicted settlements during loading are described. Settlement of the tank foundations and some measurement of the pore pressures were monitored in the field and the data obtained, presented herein, was found to be fairly consistent with the geotechnical analysis results.