Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore Exclusive -

| Site Condition | Recommended Sequence | |----------------|----------------------| | Single isolated pile | No special sequence. | | Group of piles (≤9) | Center-outwards or spiral. | | Long pile rows (e.g., for retaining walls) | Staggered, with pre-drilled pilot holes (50–70% pile diameter) to reduce displacement. | | Adjacent to MRT / existing building | Install “sacrificial” or “guard” piles first, then inner piles. Use extremely low jacking rates (<5 mm/s). |

For further reference, consult BCA’s “GEOSS Technical Reference for Deep Foundations” (TR 60) and SS EN 1997-1:2010 (Eurocode 7) with Singapore National Annex. | | Adjacent to MRT / existing building

In Singapore’s marine clay, a jacked pile gains capacity over time (thixotropic setup). GEOSS provides a time-dependent factor: In Singapore’s marine clay, a jacked pile gains

This is the core of the "Good Practice" guide, covering: In Singapore’s marine clay