Cantilever Sheet Pile Wall

The sheet piling is driven to a sufficient depth into the ground to become fixed as a vertical can tilever resisting a load from active earth pressure.

Cantilever sheet pile wall.

A cantilever sheet pile wall consists of sheet piling driven deep enough into the ground to become a fixed vertical cantilever. Sheet piling sheet piling walls cantilever sheetpiling walls depend on the passive resisting capacity of the soil below the depth of excavation to prevent overturning. Cantilever sheet pile walls tend to be prone to movement and are generally only. In such walls the sheet piles are act as a wide cantilever beam above the dredge line.

To take into account the friction between the wall and the soil we use friction angle δ φ 2. However for larger wall heights it is usually anchored using one or more anchors. The objective in analysis of sheet pile walls is to get to a depth of embedment d sufficient for the wall stability. The soil is uniform as shown in the figure.

Cantilever sheet pile walls in cantilever sheet pile wall construction heavy steel sheet piles are driven into the ground prior to excavation taking place. When excavation is carried out the soil behind the sheets is retained by their cantilever action. The depth of sheetpiling walls below thebottom of the excavation are determined by using the difference between the passive and active pressures acting on the wall. Variation of net pressure diagram and variation of moment versus depth of a cantilevered sheet pile wall is shown below.

For this purpose one needs to know the lateral earth pressure theory first. The various forces acting on a cantilever sheet pile wall are the active earth pressure on the back of the wall and the passive earth pressure on the front of the wall. Cantilever sheet piles cantilever sheet pile walls are usually recommended to use for walls of moderate height 6m measured above the dredge line. Here l1 4 m l2 8 m γ 16 1 kn m3 γsat 18 2 kn m3 and ϕ 32.

Cantilever sheet piles are used where the height of the soil or water to be retained is smaller than 4 5 m. In a limit equilibrium analysis this type of wall is supported by a lateral earth pressure equal to the difference between the active and passive earth pressures above and below a point of rotation. A sheet pile wall is required to support a 12 excavation. Sheet pile wall for temporary drydock sheet pile wall types.

Show allshow all steps figure 1 shows a cantilever sheet pile wall penetrating a granular soil. When the wall is under about 3 m in height it is often cantilevered.