Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore Link May 2026

| Do’s | Don’ts | |-------|---------| | ✅ Perform trial jacking at start of works | ❌ Jack without continuous force recording | | ✅ Monitor heave and vibration every 2–3 piles | ❌ Exceed allowable jacking force without engineer approval | | ✅ Use calibrated jacks and data logger | ❌ Ignore sudden drops in force (possible pile damage) | | ✅ Submit all records to GEOSS for archive | ❌ Assume driven pile criteria apply to jacked piles | | ✅ Protect piles from corrosion in clay | ❌ Install jacked piles within 3m of unsupported excavations |

| Anomaly | Typical Cause | GEOSS Action | |---------|---------------|---------------| | Sudden drop in jacking force | Pile fractured or entered void | Stop – extract (if possible) or grout. Proof test adjacent pile. | | Force > 120% of theoretical toe resistance | Pile tip damage or plugging in stiff clay | De-jack 1 m, re-jack at 50% rate. If repeats – replace pile. | | Heave of >15 mm at 10 m offset | Ground displacement due to closed-ended pile | Install stress relief holes (75 mm dia.) ahead of pile toe. |

The complete "GEOSS Good Practice for Installation of Jacked Foundation Piles in Singapore" (2nd Edition, 2024) is available through the Geotechnical Society of Singapore. | Do’s | Don’ts | |-------|---------| | ✅

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. One of the most valuable sections of the

One of the most valuable sections of the GEOSS good practice is the mandatory documentation protocol. For every jacked pile, the following must be recorded and submitted to the Qualified Person (QP):

These records become the link between as-built conditions and future maintenance or additional loading. Without this disciplined paperwork, the foundation cannot be certified by BCA (Building and Construction Authority, Singapore). These records become the link between as-built conditions

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.

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.