Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore [portable] Jun 2026
This formation consists of soft marine clay and loose sand. The primary risks here are pile drifting, soil heave, and lateral movement of nearby shallow foundations. 2. Old Alluvium
Singapore’s geology varies significantly, from the soft marine clay of the Kallang Formation to the hard weathered rock of the Jurong Formation.
) : Piles are typical jacked into the ground with an installation force ( Pjcap P sub j
Jacked piling (also known as displacement piling) involves installing pre-cast concrete or steel piles into the ground using hydraulic jacks reacting against the weight of the rig or previously installed piles. In Singapore, jacked piles are widely used for: This formation consists of soft marine clay and loose sand
✅ Always verify against CPT/SPT data – jacking into Old Alluvium > SPT 100 may stall the rig.
Any (e.g., MRT lines, heritage buildings)?
Once the target termination force is reached, the pressure must be held sustained (e.g., three cycles of 5-minute holds) to ensure settlement stabilizes. Handling Premature Refusal Any (e
Mandate continuous digital tracking of the alignment and stop jacking immediately if abrupt spikes in force occur alongside sudden tilting. 📊 Quality Assurance and Testing Framework
[ Hydraulic Jacking Rig ] │ ▼ (Static Compression Force) [ Prefabricated Pile Segment ] │ ▼ ┌─────────────────────┐ │ Soft Clay Layer │ ◄── Smooth Penetration ├─────────────────────┤ │ Residual Soil / │ ◄── Increased Resistance │ Bedrock Layer │ (Target Stratum) └─────────────────────┘ Key Components of a Jacked Piling System
A pile is considered "set" if its downward movement does not exceed during a minimum holding time of 30 seconds It is standard practice to achieve two consistent "sets" by releasing the force and re-jacking without pause. Maintenance and granite formations)
The first pile segment must be pitched with absolute vertical precision. GEOSS recommendations mandate monitoring verticality using two orthogonal total stations or electronic spirit levels throughout the process. The vertical deviation must not exceed 1 in 100. Step 3: Continuous Jacking
Singapore’s dense urban environment, coupled with its variable subsurface conditions (soft marine clay, old alluvium, and granite formations), demands precise, low-disturbance foundation solutions. Jacked piling—hydraulically pushing prefabricated concrete or steel piles into the ground—has become a preferred method for residential, commercial, and infrastructure projects due to its low noise, minimal vibration, and controlled load application.
