First Advisor

Trevor D. Smith

Term of Graduation

Summer 1987

Date of Publication

6-30-1987

Document Type

Thesis

Degree Name

Master of Science in Civil Engineering (MSCE)

Department

Civil Engineering

Language

English

Subjects

Soil mechanics, Retaining walls, Bonneville Dam (Or. and Wash.)

DOI

10.15760/etd.5599

Physical Description

1 online resource (2, vii, 79 pages)

Abstract

The P-y curve, used in current practice as an efficient Iine-load vs. soil displacement model for input into the finite difference method of laterally loaded pile analysis, is extended in this study for use with cohesionless soils in diaphragm wall analysis on the Personal Computer with the BMCOL7 program. An analogous W-y curve is proposed, an elastic-plastic model with line-load limits developed from classical earth-pressure theories.

A new formula for predicting a horizontal wall modulus for cohesionless soils from the pressuremeter modulus is developed for use in predicting the displacements on the W-y curves. The resulting modulus values are shown to yield reasonable displacements values.

A new procedure for modeling preloaded tie-back anchors and staged excavation for diaphragm walls was developed, utilizing multiple computer runs, updated the W-y curves, and superposition of deflections.

These new developments were applied to a parametric study of a deflection-critical section of the new Bonneville Nav-Lock Buttress Diaphragm Wall, for which extensive high-quality pressuremeter test results were available. Deflection curves of the wall are presented, showing the effect of variations in anchor preload, wall cracking, anchor slip, at-rest pressure, and soil modulus.

The results indicate that preloading will reduce wall deflections by at least 4-fold, but that wall cracking can potentially double deflections. Safety factors against passive soil failure were determined to be about 5 at anchor preload, and more than 40 after full excavation.

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Comments

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Persistent Identifier

https://archives.pdx.edu/ds/psu/20960

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