Numerical analysis of dense narrow backfills for increasing lateral passive resistance.

Rollins, Kyle L.; Nasr, Mo'oud; Gerber, Travis M.; Brigham Young University. Department of Civil and Environmental Engineering

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Numerical analysis of dense narrow backfills for increasing lateral passive resistance.

2010-08-01
By Rollins, Kyle L. ; Nasr, Mo'oud ; Gerber, Travis M.

[PDF-3.91 MB]

English

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Details:

Creators:

Rollins, Kyle L. ; Nasr, Mo'oud ; Gerber, Travis M.

Rollins, Kyle L. ; Nasr, Mo'oud ; Gerber, Travis M. Less -
Corporate Creators:

Brigham Young University. Department of Civil and Environmental Engineering
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Bridge Abutments Bridges Bridges--Utah--Abutments Lateral Loads Lateral Supports Loads Piling (Civil Engineering) Sheet Piling
Resource Type:

Tech Report
Geographical Coverage:

Utah
Edition:

Final.
Corporate Publisher:

Utah. Dept. of Transportation. Research Division
Abstract:

Previously, full-scale lateral load tests conducted on pile caps with different aspect ratios showed that placement

of a narrow, dense backfill zone against the cap could substantially increase the passive resistance. The objective

of this study is to develop design equations to predict the increased passive resistance for these limited width

backfills for both 2D and 3D conditions. For this purpose, the finite element program, PLAXIS 2D was used to

investigate the 2D or plane strain passive resistance. To validate the procedure, numerical results were calibrated

against analytical results obtained from PYCAP and ABUTMENT. The analytical models were additionally

validated by comparison with measured ultimate passive resistances. The calibrated model was then used to

simulate the passive behavior of limited width gravel backfills. Parametric studies were also executed to

evaluate the influence of a range of selected design parameters, related to the pile cap geometry and backfill soil

type, on the passive resistance of limited width backfills. Numerical results indicated that significant increases in

passive resistance could be expected for long abutment walls where end effects are less pronounced and the

geometry is closer to a plane strain condition. Based on results obtained from the parametric studies, a design

method was developed for predicting the ultimate passive resistance of limited width backfills, for both plane

strain and 3D geometries. Comparisons between measured and numerical results indicated that using the Brinch-

Hansen 3D correction factor, R3D, as a multiplier to the plane strain resistances, will provide a conservative

estimate of the actual 3D passive response of a pile cap with a limited width backfill.
Format:

PDF
Funding:

06 9148
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:b4620572e8f98d49120e61cc72367e6a1b6487e3fb8befebca2fff98f196e0a2
Download URL:

https://rosap.ntl.bts.gov/view/dot/18446/dot_18446_DS1.pdf
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Numerical analysis of dense narrow backfills for increasing lateral passive resistance.

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