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

A comprehensive analysis of the GeoSS good practices ensures structural integrity, safety, and regulatory compliance for jacked piling works in Singapore. Understanding Jacked Piles in Singapore's Context

Identifying groundwater tables and permeability helps engineers predict the magnitude of the setup effect and manage pore pressure dissipation. 4. Guidelines for Installation and Machinery

: The guideline defines a "set" when downward movement does not exceed 10 mm with a minimum holding time of 30 seconds .

Based on guidelines associated with the Geotechnical Society of Singapore (GeoSS) and Eurocode 7 standards, several best practices are critical during the installation phase: 1. Pre-Installation Planning and Soil Conditions A comprehensive analysis of the GeoSS good practices

Jacked piling—or jack-in displacement piling—utilizes a specialized hydraulic machine rig loaded with massive concrete counterweights (kentledge blocks) to press precast or spun steel sections directly into the earth. Unlike driven piling methods that use impact hammers, jacking eliminates aggressive acoustic shockwaves and ground-borne vibrations. This makes it the ideal system for land-scarce urban pockets adjacent to active Mass Rapid Transit (MRT) tunnels, historic utilities, and high-density residential properties.

It is recommended that jacking machines be used at roughly 75% of their maximum capacity (e.g., using an 800-tonne machine for a 600-tonne requirement) to ensure stability and reduce the risk of mechanical failure. Advantages and Site Considerations

When encountering highly weathered rock or dense sandy strata, piles may experience premature refusal before reaching the design depth. Excessive jacking forces applied at refusal can crush concrete pile heads or buckle steel piles. The guidelines detail specific termination criteria to prevent structural damage. 6. Testing, Quality Assurance, and Termination Criteria Guidelines for Installation and Machinery : The guideline

In Singapore, foundation design and construction are strictly regulated by the Building and Construction Authority (BCA) under the Building Control Act. While Eurocode 7 (SS EN 1997) governs general geotechnical design, localized operational challenges required a specialized, practical framework.

Singapore’s varied geology, including the Bukit Timah Granite and the Old Alluvium, requires specific design parameters:

if the final pile penetration depth is shallow—specifically . Unlike driven piling methods that use impact hammers,

In Singapore, the pile is normally jacked into the ground with a jacking force, Pjcap P sub j , adjusted in steps, typically recommended to a value of times the Working Load ( WLcap W cap L

Whether you are a geotechnical engineer, a project manager on an LTA project, or a student preparing for the P.E. examination, bookmark the official GEOSS link and embed these principles into every jacked pile you install.

GEOSS seminars and industry training materials have highlighted several common problems for displacement pile installation: