Alternative Title

Paper No. 10.09

Location

St. Louis, Missouri

Session Start Date

3-8-1998

Session End Date

3-15-1998

Abstract

The construction of a new aerobic water treatment system for polluted water in the ENJCHEM chemical plant at Mantova (N. Italy), emphasized a particular foundation problem; the complete treatment system, covering a surface area of 12000 m2, lies on a zone once used as a waste fill, 4-6 m deep and composed of various materials from industrial processing, with highly variable origins and poor resistance characteristics. The main structures are: steel tanks with fixed roofs, and gauge and settling tanks, of 30 and 26 m diameter respectively, each containing a 15-m water head, reinforced concrete sediment thickeners and degassing basins with diameters of 15 and 35 m, each containing a 3-4 m restricted water head. The requirement to avoid contact between waste materials and the natural soil beneath excluded the possibility of deep foundations on piles. Shallow foundations were therefore necessary; 4-8 m preloading embankments were designed in relation to the characteristics of the fill and the subsoil, working loads, and the need to limit settlements and distortions. The design criteria of preloading, measurements of embankment settlements (400-700 mm) and main structures during hydraulic testing are reported and discussed.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-8-1998

Document Version

Final Version

Rights

© 1998 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 8th, 12:00 AM Mar 15th, 12:00 AM

A Particular Foundation Problem on a Waste Fill

St. Louis, Missouri

The construction of a new aerobic water treatment system for polluted water in the ENJCHEM chemical plant at Mantova (N. Italy), emphasized a particular foundation problem; the complete treatment system, covering a surface area of 12000 m2, lies on a zone once used as a waste fill, 4-6 m deep and composed of various materials from industrial processing, with highly variable origins and poor resistance characteristics. The main structures are: steel tanks with fixed roofs, and gauge and settling tanks, of 30 and 26 m diameter respectively, each containing a 15-m water head, reinforced concrete sediment thickeners and degassing basins with diameters of 15 and 35 m, each containing a 3-4 m restricted water head. The requirement to avoid contact between waste materials and the natural soil beneath excluded the possibility of deep foundations on piles. Shallow foundations were therefore necessary; 4-8 m preloading embankments were designed in relation to the characteristics of the fill and the subsoil, working loads, and the need to limit settlements and distortions. The design criteria of preloading, measurements of embankment settlements (400-700 mm) and main structures during hydraulic testing are reported and discussed.