Sheet pile walls
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SHEET PILE WALLS. generally used for retaining shallow heights of soil wharfs, key walls temporary structures for excavation (eg. dredging). From McCarthy, 6 th Edition. Cantilever Sheet Pile Walls. stability depends on passive resistance developed below the lower soil surface

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SHEET PILE WALLS

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Sheet pile walls

SHEET PILE WALLS

generally used for retaining shallow heights of soil

wharfs, key walls

temporary structures for excavation (eg. dredging)


Sheet pile walls

From McCarthy, 6th Edition


Cantilever sheet pile walls

Cantilever Sheet Pile Walls

  • stability depends on passive resistance developed below the lower soil surface

  • failure is by rotation about a point O near bottom of wall

Active E.P.

Depth of embedment, d

d

O

Passive E.P.

fixity


Sheet pile walls

  • a fixing moment is provided by the extra depth below point O to prevent rotation

  • Generally, design is based on a simplified but equivalent approach: the fixity provided previously is replaced by a resisting force, R at point C which is just below point O

Active E.P.

Passive E.P.

d

R

C


Danish rules

Danish Rules

  • a factor of safety, FPis applied to the passive resistance in front of the wall

  • take moments about C to calculate d

  • then, increase d by 20% (empirical)

  • finally, check that the passive resistance provided by the extra 20% is > R, where R = SPH


Free earth support

Free Earth Support

tie rod

T

da

A

b

  • Determine the depth of embedment, d by taking moments about A (SMA = 0, apply FP)

  • Find tension, T from SFH = 0 (don’t apply FP)

  • Constraints: failure wedges must not overlap

    b >½da

Passive E.P.

45° - f/2

Active E.P.

anchor wall

d

45° + f/2

no fixity


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