Practice For Installation Of Jacked Foundation Piles In Singapore | Geoss Good

The Geotechnical Society of Singapore (GeoSS) has established guidelines for the installation of jacked foundation piles, focusing on ensuring structural integrity and minimizing ground disturbance in Singapore's diverse geological conditions. Key Good Practices for Installation

• Pile ID, dimensions, concrete grade
• Jacking force vs. depth (graph)
• Rate of penetration anomalies
• Verticality readings
• Any stoppage or repair
• Temperature (if concrete curing < 7 days – rarely needed for jacking)
• Witness signature (RE/RTO)

5.2 Heave & Lateral Displacement

• Pile Integrity Test (PIT): Low-strain impact test on 100% of piles (as per BCA’s requirement for jacked piles in Singapore). Detects cracks or necking.
• Static Load Test (SLT): Minimum 1% of piles (or 2 piles per building, whichever higher). Apply load up to 200% working load using kentledge or bi-directional cell.
• Dynamic Load Test (optional but common): High-strain PDA test on 5–10% of piles to confirm set-up factor and soil resistance.

• For piles < 3D spacing, install in two stages (wait 1 day between stages).

Heave Control: In formations like Bukit Timah Granite, recorded heaves of 10 mm to 60 mm have occurred, requiring verification through additional working load tests. 5. Design and Compliance Pile ID, dimensions, concrete grade Jacking force vs