SHEET PILE WALLS

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# SHEET PILE WALLS - PowerPoint PPT Presentation

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

generally used for retaining shallow heights of soil

wharfs, key walls

temporary structures for excavation (eg. dredging)

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

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
• 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

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