Abstract/Details

Passive earth pressures behind integral bridge abutments


1999 1999

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Abstract (summary)

A full-scale prototype integral bridge abutment was constructed at the University of Massachusetts Amherst as part of a project conducted for the Massachusetts Highway Department. Ten tests were then conducted during which the abutment was passively displaced into the backfill. The purpose of these tests was to determine the effect of foundation type, wingwall geometry, reloading, and backfill soil type on the lateral pressures generated following placement of the backfill and during the abutment movement.

Individual tests were performed by placing and compacting the fill in lifts and then incrementally displacing the abutment into the fill. During this displacement, earth pressures at the abutment centerline, ‘quarterline,’ and wingwall centerline as well as the applied load and deflection of the abutment and wingwalls were measured. After a series of tests were performed with the abutment on a spread footing, the abutment was removed and piles were driven through precast holes in the footing. Two piles were instrumented with strain gages and inclinometers. The abutment was then replaced and the same types of tests were again performed.

Results from testing indicated that during no test was the distribution or magnitude of lateral earth pressures similar to that predicted by classical theory. The use of an uncompacted sand zone directly behind the abutment face was found to reduce lateral earth pressures significantly. This zone was, however, found to compact after one cycle of reloading. Both wingwall geometry and foundation type were found to affect the lateral earth pressure magnitude and distribution.

Equations were developed which predict the lateral earth pressure coefficient for any abutment deflection or point along the abutment height. Current design charts were also modified to account for the behavior observed during these tests.

Indexing (details)


Subject
Civil engineering;
Geotechnology
Classification
0543: Civil engineering
0428: Geotechnology
Identifier / keyword
Applied sciences; Bridge abutments; Earth pressures; Passive pressures
Title
Passive earth pressures behind integral bridge abutments
Author
Thompson, Theodore Algernon, Jr.
Number of pages
365
Publication year
1999
Degree date
1999
School code
0118
Source
DAI-B 60/02, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780599199903, 0599199903
Advisor
Lutenegger, Alan J.
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
9920660
ProQuest document ID
304515373
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304515373
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