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

Jacked piles are displacement piles that use hydraulic jacks to push pile segments into the ground. In Singapore’s unique geological context—often involving soft marine clay, old alluvium, and weathered rock—jacked-in piles are favored over driven piles to mitigate the risk of damage to adjacent infrastructure and neighboring properties.

The pile is jacked into the ground, with the jacking force adjusted in steps. The target force, Pjcap P sub j , is generally recommended to be times the Working Load ( WLcap W cap L

Comprehensive Guide: GeoSS Good Practice for Installation of Jacked Foundation Piles in Singapore Jacked piles are displacement piles that use hydraulic

: The method offers superior verticality and eliminates the risks associated with workers operating at height. 3. Critical Site Considerations

In Singapore’s dense urban environment, the demand for high-capacity, low-noise, and vibration-free foundation systems has made jacked-in piles a popular choice. The Geotechnical Society of Singapore (GeoSS) emphasizes specific guidelines and good practices to ensure that these displacement piles meet stringent design requirements and local building regulations, particularly under the Eurocode 7 framework. The target force, Pjcap P sub j ,

Once refusal pressure is met, the hydraulic force Pjcap P sub j

GeoSS Good Practice for Installation of Jacked Foundation Piles in Singapore Handling Short Piles and Premature Refusal

Using data from static load tests to derive characteristic resistance.

The BCA's official circular is the key implementing document. You can also find other supplementary materials:

Jacked foundation piles are a type of deep foundation that is installed by jacking a steel or concrete pile into the ground using a hydraulic jack. The pile is seated on a firm stratum, and the jacking process is typically accompanied by the injection of grout or concrete to fill the annular space between the pile and the soil. Jacked foundation piles are commonly used in Singapore for building foundations, particularly in areas with soft or unstable soil conditions.

Because jacked piles are high-displacement elements, installing outer piles first locks in lateral soil stresses. This makes inner pile penetration exponentially more difficult and increases the risk of damaging neighboring piles via displacement. 3. Handling Short Piles and Premature Refusal