Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

For a large scale expansion of an existing wastewater treatment plant in Virginia, constructing shallow foundations after surcharging to pre-consolidate the compressible soils at the site was found to be the most attractive foundation option. A detailed geotechnical investigation was performed to characterize the site stratigraphy and soil properties. Many of the tall and steep surcharge embankments were in close proximity of existing operating structures and utilities. Such tall and steep surcharge slopes were designed and constructed of mechanically stabilized earth (MSE). Due to the complex slope geometries, subsurface conditions and nearby critical utilities and existing structures, each MSE slope design required multiple analyses to determine the required geo-synthetic strength and embedment lengths, which were larger than what would be required for typical projects. A detailed investigation was also performed to investigate sources adjacent to the plant site, for procurement of the large volume (over one million cubic yards) of borrow material required for the surcharge embankments. Monitoring was performed during construction to ensure that the surcharging program performed as designed and did not adversely impact the existing plant facilities.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

Share

 
COinS
 
Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Mechanically Reinforced Earth for Steep Surcharge Slopes in Proximity of Adjacent Structures to Improve Compressible Soils

Arlington, Virginia

For a large scale expansion of an existing wastewater treatment plant in Virginia, constructing shallow foundations after surcharging to pre-consolidate the compressible soils at the site was found to be the most attractive foundation option. A detailed geotechnical investigation was performed to characterize the site stratigraphy and soil properties. Many of the tall and steep surcharge embankments were in close proximity of existing operating structures and utilities. Such tall and steep surcharge slopes were designed and constructed of mechanically stabilized earth (MSE). Due to the complex slope geometries, subsurface conditions and nearby critical utilities and existing structures, each MSE slope design required multiple analyses to determine the required geo-synthetic strength and embedment lengths, which were larger than what would be required for typical projects. A detailed investigation was also performed to investigate sources adjacent to the plant site, for procurement of the large volume (over one million cubic yards) of borrow material required for the surcharge embankments. Monitoring was performed during construction to ensure that the surcharging program performed as designed and did not adversely impact the existing plant facilities.