FLOOD03439

• County: Statewide
• Basin: Statewide
• Title: Design of Sheet Pile Walls
• Date: 3/31/1994
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Educational/Technical/Reference Information

EM 1110.2-2504
31 Mar 94

i. Dredge line: A generic Ienn applied 10 Ihe soil
surface on Ihe dredge side of a retaining or fIoodwall.

j. Wall height: The lenglh of Ihe sheel piling above
Ihe dredge line.

k. Backfill: A generic tenn applied 10 !he malerial
0/1 the retained side of Ihe ....a11.

I. Foundation: A generic !enn applied 10 Ihe soil
0/1 eilher side of Ihe wall below Ihe elevation of Ihe
dredge line.

III. Anchorage: A mechanical assemblage consisting
of wales, tie rods. and anchors which supplemenl soil
support for an anchored wall.

(I) Single anchored wall: Anchors are attached 10
the wall aI only one elevation.

(2) Multiple anchcred wall: Anchors are attached
10 the wall aI more than one elevation.

n. Anchor foru: The reaction force (usually
expessed per fool of wall) which Ihe anchor muSl
provide 10 the ....aII.

o. Anchor: A device or structure ....hich. by
inleral:ling wilh !he soil or rock, generales the required
anchor force.

p. Tie rods: Parallel bars or !endons which transfer
the anchor force from the anchor 10 Ihe wales.

q. Wales: Horizonlal beam(s) attached 10 Ihe wall 10
lrlIIIsfer Ihe anchor force from Ihe tie rods 10 Ihe sheel
piling.

1-2

r. Passive pressure: The limiting pressure between
Ihe wall and soil produced when the relative walVsoil
motion tends 10 compress !he soil horizontally.

s. Active pressure: The limiting pressure between
the wall and soil produced when Ihe relative walVsoil
motion tends 10 allow Ihe soil 10 expand horizontally.

t. At-rest pressure: The horizonlal in silu earth
pressure when no horiwnlal defonnation of Ihe soil
occurs.

II. Penetration: The deplh 10 which !he sheel piling
is driven below Ihe dredge line.

v. Classical design procedures: A process for eval-
uating Ihe soil pressures, required penelration, and
design forces for cantilever or single anchored walls
assuming limiting slates in Ihe walVsoil system.

w. Factor of safety.

(I) Factor of safely for rolational failure of Ihe entire
waIVsoil system (mass overturning) is Ihe ratio of
available resisting effort 10 driving effort.

(2) Factor of safely (strenglh reduction faclor) ap-
plied 10 soil strength parameters for assessing limiting
soil pressures in Classical Design Procedures.

(3) SlrUclUra1 malerial faclor of safely is the ratio of
limiting stress (usually yield slress) for !he material 10
the calculated stress.

)C. Soil-strllcture interaction: A process for analyz-
ing waIVsoil systems in which compatibilily of soil
pressures and slrUclural displacements are enforced.

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