The Geotechnical Society of Singapore (GeoSS) provides essential guidelines for the installation of jacked foundation piles, a method widely favored in urban construction due to its low noise and vibration levels. These "Good Practice" standards ensure structural integrity and geotechnical stability in Singapore's diverse soil conditions, such as the Old Alluvium or soft marine clays. Core Installation Principles
Abstract
This paper examines best-practice recommendations—hereafter referred to as “GEOSS Good Practice”—for the installation of jacked foundation piles in Singapore. It synthesizes geotechnical, structural, environmental, and construction-management considerations specific to Singapore’s geology, regulatory context, and urban constraints. Recommendations are practical, prescriptive, and intended for design engineers, contractors, site supervisors, and project owners involved in piled foundation works where jacking (hydraulically driven, displacement or pre-bored) methods are employed. Establish alarm (early) and stop (intervention) levels for
| Formation | Characteristics | Jacked pile suitability | |-----------|----------------|------------------------| | Marine Clay (upper/lower) | Soft to firm, high compressibility | Good – full displacement helps densify | | Kallang Formation | Soft clay, peaty layers, sands | Good with sleeve or lubrication | | Old Alluvium | Dense to very dense, silty sand | Difficult – may need pre-boring or limited depth | | Jurong Formation | Weathered sedimentary rock | Requires shoe and high jacking force | Continuous Monitoring : During the first pile installation,
5.4 Jointing and Splicing
Continuous Monitoring: During the first pile installation, a trial should be conducted to observe performance. Ongoing monitoring of both ground and building movement is required throughout the piling works. Termination and Technical Standards and urban constraints. Recommendations are practical
: Piles must be checked for verticality throughout the process. Crucially, their alignment should never be adjusted by force during installation Course Hero : Piles are typically joined by several sections together as penetration progresses Final Settlement and "Set" Criteria