Sheet pile walls consist of continuously interlocked pile segments embedded in soils to resist horizontal pressures. Classified as a flexible retaining system, sheet pile walls can tolerate relatively large deformations.
Sheet piles are being used as retaining systems for many years. They are widely used for several purposes such as:
*large and waterfront structures
*erosion protection
*stabilizing ground slopes
*shoring walls of trenches and other excavations, and cofferdams.
Generally sheet piles that used for retaining walls are classified as Anchored sheet piles or Cantilevered sheet piles. Sheet piles are made of different kinds of materials such as wood, concrete, steel or aluminum and these different materials cause different applications which are illustrated in following sections.
Sheet pile walls are constructed by:
1. Laying out a sequence of sheet pile sections, and ensuring that sheet piles will interlock.
2. Driving (or vibrating) the individual sheet piles to the desired depth.
3. Driving the second sheet pile with the interlocks between the first sheet pile and second
"locked"
4. Repeating steps 2 & 3 until the wall perimeter is completed.
5. Use connector elements when more complex shapes are used.
Sheet pile wall disadvantages are:
1. Sections can rarely be used as part of the permanent structure.
2. Installation of sheet piles is difficult in soils with boulders or cobbles. In such cases, the desired
wall depths may not be reached.
3. Excavation shapes are dictated by the sheet pile section and interlocking elements.
4. Sheet pile driving may cause neighborhood disturbance.
5. Settlements in adjacent properties may take place due to installation vibrations.
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