Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore Jun 2026

Whether you are a geotechnical engineer, a resident engineer, or a contractor, understanding these guidelines is critical for ensuring structural integrity and site safety.

However, successful implementation requires rigorous adherence to quality standards. This is where the provides essential direction through its Good Practice Guide .

| Formation | Characteristics | Jacked pile suitability | |-----------|----------------|------------------------| | | Soft to firm, high compressibility | Good – full displacement helps densify | | Kallang Formation | Soft clay, peaty layers, sands | Good with sleeve or lubrication | | Old Alluvium | Dense to very dense, silty sand | Difficult – may need pre-boring or limited depth | | Jurong Formation | Weathered sedimentary rock | Requires shoe and high jacking force | Whether you are a geotechnical engineer, a resident

Jacked piles are —meaning they are installed by forcing soil aside rather than removing it. Displacement piles are defined as piles installed into the ground by driving, jacking, vibration, or screwing, without excavation or removal of materials except to limit heave, reduce vibration, remove obstructions, or assist penetration (BS EN 12699).

: Jacking continues under the target Pjcap P sub j force until downward penetration halts. The Unloading/Reloading Cycle : The Pjcap P sub j | Formation | Characteristics | Jacked pile suitability

The job isn't done when the jack is removed.

Beyond basic installation, several operational practices are vital for high-quality outcomes: No Forced Alignment: The Unloading/Reloading Cycle : The Pjcap P sub

A pre-construction trial jacking (at least 2 piles) must be witnessed by the QP to validate driving energy, set-up behaviour, and reaction system capacity.