Jacked piles, often referred to as hydraulic jacked-in piles, are displacement piles that are pushed into the ground using hydraulic rams. This method is exceptionally suited for Singapore’s challenging soil conditions, which frequently involve thick layers of soft marine clay (e.g., the Kallang Formation) overlying stiff soil or bedrock.
Sudden "refusal" on boulders or hard intermediate layers can result in short piles. If a pile is more than 20% shorter than the design depth, an amendment plan or additional load testing may be required. Regulatory and Safety Standards Jacked piles, often referred to as hydraulic jacked-in
The Piling - Good Practice Guide provides broader guidance on site investigation, documentation, and integrity logs required for local authorities. If a pile is more than 20% shorter
Jacked foundation piles offer a silent, vibration-free solution for Singapore’s increasingly crowded subsurface. But silent does not mean simple. Soil heave, pile deviation, and refusal are real risks that demand rigorous good practice. But silent does not mean simple
: Designers must specify penetration depths based on site investigation (SI) boreholes. However, in Singapore, most specify the jacking force and set criterion on the piling plan as the primary termination metric. Floating Boulders
: Because jacked piles are displacement piles, monitoring heave and ground movement is mandatory to prevent damage to adjacent structures.