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

: In the context of Singapore’s construction industry, “GEOSS” refers to the Geotechnical Society of Singapore (GeoSS). This is distinct from the “Global Earth Observation System of Systems” which shares the same acronym.

The installation of jacked foundation piles in Singapore requires careful planning, execution, and monitoring to ensure their stability, safety, and performance. By following good practice guidelines, such as accurate pile positioning, soil disturbance minimization, pile driving control, pile integrity testing, and quality control, the risk of pile failure can be minimized, and the performance of the foundation system can be optimized. The case study demonstrates the importance of good practice guidelines in ensuring the successful installation of jacked foundation piles in Singapore.

The selection of the hydraulic jacking rig and the execution of the installation process are critical to preventing pile damage and ensuring design capacity. Rig Selection and Capacity : In the context of Singapore’s construction industry,

| 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 |

The industry benchmark GeoSS Guideline on Jacked Piles outlines rigorous engineering methodologies to guarantee structural integrity, precise capacity evaluation, and safety across Singapore's complex geological formations. 1. Core Principles of Hydraulic Jacked Piling By following good practice guidelines, such as accurate

In Singapore’s densely built environment, (also known as hydraulic jacked piles or silent piles) are increasingly preferred over driven piles due to their low noise, minimal vibration, and reduced ground disturbance. The Geotechnical Engineering Office of Singapore (GEOSS) – under the Building and Construction Authority (BCA) – provides a centralized platform for sharing geotechnical knowledge, including best practices for pile installation.

Singapore’s subsurface profile is highly variable, demanding rigorous engineering oversight before and during pile jacking. The two primary formations that dictate jacking behavior are: Rig Selection and Capacity | Do’s | Don’ts

The complete (2nd Edition, 2024) is available through the Geotechnical Society of Singapore.

It is recommended that the jacking machine be used at no more than 75% of its maximum capacity to ensure safety and equipment longevity.

The hydraulic pressure gauge gives an immediate indication of the soil resistance and ultimate load capacity during installation. Critical Geological Challenges in Singapore

) of a jacked pile relates closely to its final termination jacking force ( Pjcap P sub j Research shows Pucap P sub u generally ranges from . Pucap P sub u falls below Pjcap P sub j