Cantilever Sheet Pile Wall Design

Because cantilever walls derive their support solely from the foundation soils they may be installed in relatively close proximity to existing structures.

Cantilever sheet pile wall design.

A cantilever sheet pile wall consists of sheet piling driven deep enough into the ground to become a fixed vertical cantilever. Figure 1 basic configuration with nomenclature of a cantilever sheet pile wall in a uniform soil in simple terms sheet piles are supported by the passive pressures below the dredge line offsetting either in overturning or sliding the active pressures on the earth side. The soil is uniform as shown in the figure. Deeper cantilever walls have been constructed but these required more expensive wall systems such as t type diaphragm walls.

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. It is based on the blum theory a limit equilibrium method lem. Advantages of cantilever walls. To take into account the friction between the wall and the soil we use friction angle δ φ 2.

Cantilever walls offer an unbstructed open excavation. Use factor of safety 1 5 for. A sheet pile wall is required to support a 12 excavation. A cantilevered sheet pile wall performs somewhat like a cantilevered beam.

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. It covers every aspect of sheet pile design including the soil mechanics and earth pressure theory involved in sheet pile design structural considerations design of both cantilever and anchored walls earthquake design for sheet pile walls seepage and hydrostatic loads anchor systems and tiebacks cofferdams corrosion and more. The active pressure tends the wall to move away from the backfill while the passive earth pressure resists the wall movement. 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.

In general the maximum excavation for a cantilever wall can reach up to 6m or 18ft. Of deepex on secant pile walls with our technical experts. Design of cantilevered wall granular soil introduction. Cantilever sheet piles are used where the height of the soil or water to be retained is smaller than 4 5 m.

Cantilever sheet pile walls cantilever walls are usually used as floodwall or as earth retaining walls with low wall heights 3 to 5 m or less. Please note this value is applied only for passive pressure. It is a quite simple tool to determine all the forces required for designing a sheet pile retaining wall and ideal for preliminary designs. Cantilever walls offer some advantages.