: Continuous monitoring of pile heave is essential. The jacking of adjacent piles can cause an already installed pile to lift, potentially separating the pile base and leading to a loss in end-bearing capacity.
The Geotechnical Society of Singapore (GeoSS) guidelines for jacked foundation piles recommend using jacking machines up to approximately 75% of their maximum capacity to ensure safety and performance. Piles are typically jacked to 2 to 2.5 times the Working Load, with a "set" defined as a downward movement not exceeding 10 mm over a 30-second hold time upon reaching refusal. Read the full Guideline on Jacked Piles (GeoSS) at Course Hero Course Hero
In soft Kallang marine clay, jacking displaces significant volumes of soil. Nearby structures, utility lines, and MRT structures must be monitored using inclinometers, tiltmeters, and settlement markers to track ground heave or lateral displacement. Conclusion : Continuous monitoring of pile heave is essential
Good Practice for Installation of Jacked Foundation Piles in Singapore
The GEOSS standard is notably stricter on ground movement and verticality, recognizing Singapore's density of underground infrastructure. Piles are typically jacked to 2 to 2
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
Jacked piling, also known as hydraulic jacking, involves pushing precast or spun piles into the ground using static hydraulic force rather than dynamic impact. This method is particularly suitable for Singapore’s urban environment, where noise and vibration from traditional driven piles could damage adjacent structures. also known as hydraulic jacking
Before examining the document's contents, it's helpful to understand the organization behind it. The Geotechnical Society of Singapore (GeoSS) is the nation's premier professional body for geotechnical engineering, established in 2008 to promote excellence and best practices within the industry. As a member of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE), GeoSS actively shapes technical standards and guidelines. The joint circular you are about to read is a direct result of GeoSS’s mission to provide authoritative guidance to Singapore's building professionals.
: Piling specialists must maintain substantial counterweight setups. Under the Singapore Accreditation Council (SAC) criteria for specialist builders, minimum counterweights of 200-ton and 400-ton are required depending on the builder's category.