Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore [updated]
18-storey residential tower, Punggol Northshore District. Geology: Fill (2 m) over Kallang Formation marine clay (12 m) over Old Alluvium (dense, N=60+). Challenge: Piles required termination in Old Alluvium, but adjacent pile driving caused heave in earlier phases.
The pile alignment should not be adjusted by force during installation. If a pile deviates, corrective actions should be taken, or the pile should be abandoned if necessary.
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A dense, cemented silty sand deposit covering eastern Singapore. Jacked piles in the Old Alluvium develop exceptional end-bearing capacity. However, the high density of this formation can cause extreme jacking resistance, increasing the risk of pile damage during installation if the driving force is miscalculated. 3. GEOSS Recommended Installation Workflow 18-storey residential tower, Punggol Northshore District
A successful jacked piling campaign begins long before the rig arrives on site. Detailed planning prevents unexpected refusal or excessive soil displacement.
GeoSS recommends achieving two consistent sets before termination.
: Ground penetrating radar (GPR) and trial trenches must be used to locate underground utilities, old foundations, or boulders that could deflect or damage the piles. The pile alignment should not be adjusted by
Under Eurocode 7 (EC7), which Singapore has adopted, design has shifted from prescriptive safety factors to a statistical, reliability-based approach. Site investigation data must be used to determine of ground properties—a process that requires professional judgement and statistical analysis. All soil tests must be carried out by a laboratory accredited under the Singapore Laboratory Accreditation Scheme (SAC-SINGLAS).
This article outlines the key best practices for installing jacked piles based on GEOSS guidelines and local industry standards. 1. Pre-Installation Site Investigation and Preparation
If you are interested in more specific details, I can help you with: A dense, cemented silty sand deposit covering eastern
Singapore’s subsurface is not a uniform canvas. The island presents a complex mosaic of geological formations—from the hard Bukit Timah Granite in the central and northern regions to the soft, compressible Marine Clay that encircles much of the island’s coastal periphery. The Jurong Formation in the west contains unpredictable limestone cavities that can complicate piling works. This geological heterogeneity means that a piling method that is economical in Bedok may be unsuitable—or even dangerous—in Bukit Timah.
For jacked piles, termination—the point at which jacking stops—is typically based on: