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

The complete "GEOSS Good Practice for Installation of Jacked Foundation Piles in Singapore" (2nd Edition, 2024) is available through the Geotechnical Society of Singapore.

Direct access link:
👉 https://www.geoss.org.sg/publications/good-practice-jacked-piles
(Note: This is the official institutional link as referenced by BCA Singapore. Always verify the URL ends with .sg and contains "/good-practice-jacked-piles".)

For members, a free PDF download is available. Non-members may purchase the guide at S$120 (hardcopy) or S$90 (digital). The document includes 12 appendices, including sample checklists, heave calculation nomographs, and calibration log templates. The complete "GEOSS Good Practice for Installation of

Singapore’s urban landscape is a testament to advanced geotechnical engineering. With land scarcity driving developments both skyward and below ground, the demand for robust, low-noise, and low-vibration foundation solutions has never been higher. Among the various piling techniques, jacked piling (also known as silent piling or hydraulic jacking) has emerged as a preferred method for installing displacement piles in dense urban environments.

However, improper jacked piling can lead to ground heave, lateral displacement of adjacent piles, damage to existing structures, and even pile refusal. To address these challenges, the Geotechnical Society of Singapore (GEOSS) has published a definitive framework known as the GEOSS Good Practice for Installation of Jacked Foundation Piles in Singapore. Singapore’s urban landscape is a testament to advanced

This article provides a comprehensive breakdown of that good practice guide, offering engineers, contractors, and project managers a direct link between theoretical design and site execution. For the official GEOSS document, refer to the link provided at the end of this article.

Important note: The GEOSS platform is a restricted-access system for registered geotechnical professionals in Singapore. However, public summaries and BCA resources are available at the links below. Important note : The GEOSS platform is a

| Step | Action | Good Practice | |------|--------|----------------| | 1 | Positioning | Align pile vertically using spirit levels or digital inclinometers. Tolerance ≤ 1:200. | | 2 | Initial jacking | Start slowly (≤ 5 mm/s) until pile self-penetrates. Record initial resistance. | | 3 | Continuous jacking | Maintain constant rate; avoid sudden stops to prevent soil setup. | | 4 | Jointing | For segmental piles, clean end plates, apply epoxy if specified, and torque bolts to requirement. | | 5 | Termination | Stop when final set resistance reaches 2× working load or as per design (e.g., 300–500 kN for typical 250 mm pile). | | 6 | Restrike (if specified) | Wait 24–72 hours for soil setup, then re-jack to confirm capacity. |

In soft marine clay, jacking multiple piles can cause surface heave of 50–100 mm, damaging nearby buried utilities.
GEOSS Solution: Limit jacking rate to 2 mm/s in clay and install relief slots or pre-drilled guide holes.