Cantilever Sheet Pile Wall Design

Here l 1 4 m l 2 8 m γ 16 1 kn m 3 γ sat 18 2 kn m 3 and ϕ 32.

Cantilever sheet pile wall design.

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. Cantilever sheet pile walls are usually recommended to use for walls of moderate height 6m measured above the dredge line. Please note this value is applied only for passive pressure. A cantilever sheet pile wall consists of sheet piling driven deep enough into the ground to become a fixed vertical cantilever.

When excavation heights exceed 5 ft 1 5 m we need to design a lateral support system. 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. Use factor of safety 1. In cantilever sheet pile wall construction heavy steel sheet piles are driven into the ground prior to excavation taking place.

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. What is the theoretical depth of embedment d. A cantilevered sheet pile wall performs somewhat like a cantilevered beam. A sheet pile wall is required to support a 12 excavation.

Figure ts14r 6 illustrates both a cantilever sheet pile wall and an anchored 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. 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. For a 30 increase in d what should be the total length of the sheet piles.

A cantilever wall of this kind is permissible up to about 17 ft 5 2 m. When excavation is carried out the soil behind the sheets is retained by their cantilever action. Design of cantilevered wall granular soil introduction. Cantilever sheet pile walls tend to be prone to movement and are generally only.

Figure 1 shows a cantilever sheet pile wall penetrating a granular soil. Sheet pile walls may be cantilever or anchored walls. To take into account the friction between the wall and the soil we use friction angle δ φ 2. In such walls the sheet piles are act as a wide cantilever beam above the dredge line.

Cantilever sheet piles are used where the height of the soil or water to be retained is smaller than 4 5 m.