Abstract/Details

Structural backfill design for corrugated-metal buried structures


1989 1989

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Abstract (summary)

The aim of this study is to provide a design method for the structural backfill envelope surrounding corrugated-metal buried conduits that will consider the behavior of the surrounding soil as well as the structure's properties.

The requirements of the structural backfill envelope are discussed. Previous design practice is reviewed and its deficiencies are pointed out. The need for an appropriate design method for the structural backfill envelope is shown.

Soil models for finite element analysis of soil-conduit systems are presented. Soil parameters for these models are evaluated to investigate their suitability. As a result of this evaluation, recommended values of soil parameters for design are suggested. It is shown that the performance of two field installations is satisfactorily predicted using these recommended values.

A study of the constructability of soils showed that granular soils are much easier to place and compact to minimize structural distortion and provide much higher support to the conduit than cohesive soils.

A design criterion for the width of the structural backfill envelope based on limiting values of deflection is presented.

A design approach for conduit wall thrust is also developed. This approach considers the effects of conduit shape, width of structural backfill envelope, fill height, conduit size, and compression and bending stiffnesses. Arching factors from different methods are compared. After reviewing the past work on buckling, the elastic continuum theory is used to develop buckling design charts. The effects of the width of structural backfill envelope, relative stiffness between the conduit and the structural backfill soil, the relative stiffness between the surrounding soil and the structural backfill soil, and the height of fill are included in these charts.

Indexing (details)


Subject
Civil engineering
Classification
0543: Civil engineering
Identifier / keyword
Applied sciences
Title
Structural backfill design for corrugated-metal buried structures
Author
Haggag, Atef Ameen
Number of pages
271
Publication year
1989
Degree date
1989
School code
0118
Source
DAI-B 50/08, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Advisor
Selig, Ernest T.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9001508
ProQuest document ID
303776634
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/303776634
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