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Automatic data loggers should record jacking force versus depth continuously. Sudden drops in pressure may indicate pile damage or unexpected soft pockets.
(the Geotechnical Society of Singapore) is a professional society established in 2008 under the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE). GEOSS works closely with the BCA , the Institution of Engineers Singapore (IES) , and the Association of Consulting Engineers Singapore (ACES) to develop and promote good practices across the geotechnical industry.
Jacking foundation piles into the ground using hydraulic machinery offers a low-noise, low-vibration alternative to traditional methods. However, navigating Singapore’s complex geology—ranging from soft marine clay to highly weathered rocks—requires strict adherence to standardized engineering practices to ensure structural integrity and safety. 1. Regulatory Context and the Role of GeoSS
Jacked piling is highly favored in urban Singapore for its vibration-free, low-noise, and pollution-free nature. Below are the key installation practices based on GeoSS guidelines Course Hero 1. Equipment & Planning Machine Capacity
: 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.
NEA has stringent noise limits for construction activities and provides funding for quieter equipment, including jack-in piling systems. Contractors may be required to install continuous noise monitoring systems at construction sites. Research studies in Singapore have evaluated noise and vibration levels from silent piling rigs against NEA limits, confirming that jacked piles offer a viable low-impact alternative to vibro hammers.
: Unlike driven piles, every jacked pile undergoes a form of load testing during the actual installation process.
: A pile is officially terminated if the net downward movement does not exceed 10 mm under a minimum holding time of 30 seconds . If the settlement is greater, the cycle must be repeated until the pile satisfies the design engineer's strict limits. 3. Ground Challenges and Mitigation Strategies
Singapore's diverse geology—ranging from the soft marine clay of the Kallang Formation to the stiff, weathered profiles of the Bukit Timah Granite and Old Alluvium—poses significant risks during displacement piling. Soil Displacement and Ground Heave
Jacked-in piles are installed by forcing precast concrete or steel pile segments into the ground using a hydraulic jacked-in machine, which relies on counterweights (often concrete kentledge) rather than conventional hammering. This method is ideal for Singapore’s piling projects near sensitive structures, heritage buildings, or MRT lines, as it causes minimal disturbance to the surrounding soil. Key aspects of the process include:
