| Mode | Condition | Objective | |------|-----------|------------| | Force control | Soft to medium stiff clay (N < 15) | Maintain constant jacking force, record penetration rate (mm/min). | | Rate control | Dense sand / Old Alluvium (N > 30) | Limit penetration rate to < 5 mm/sec to avoid excessive load spikes. | | Stroke control | Final set-up (refusal) | Advance in 50 mm strokes; record final jacking pressure at each stroke. |
: While early use focused on small piles, modern projects often use large-capacity piles, such as 600 mm diameter spun piles Challenging Ground : Successful installations have been recorded in areas like Bukit Timah Granite
) is typically related to the ultimate geotechnical capacity ( cap P sub u ), often set at 2.0 to 2.5 times the working load (WL) Set Criterion: | : While early use focused on small
Successful jacked piling requires comprehensive ground data and meticulous site preparation. Geotechnical Investigation
: Specialist builders must perform integrity tests (such as PDA or sonic logging) to demonstrate that piles are free of hidden defects. These systems record: Jacking force versus depth profile
Modern jacking rigs must be equipped with automated data loggers. These systems record: Jacking force versus depth profile. Verticality deviations. Rate of penetration. Structural and Environmental Monitoring
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. because they are displacement piles
For the full GEOSS document (2021 edition) and the latest addendum on jacked piles, visit the Singapore Society for Geotechnical Engineering (SSGE) portal.
GEOSS guidelines emphasize maintaining verticality within 1 in 100 to prevent structural eccentricities. The Jacking Process
Related search suggestions: geological survey Singapore, jacked pile installation procedure, marine clay foundation design.
to govern the successful installation of jacked foundation piles within the country's highly variable geology . Jacked piling, also known as jacked-in or hydraulic displacement piling, offers a noise-free and vibration-free alternative to traditional driven piles. This makes it a popular choice for high-density urban developments in Singapore. However, because they are displacement piles, their design and execution must strictly comply with Eurocode 7 (EC7) and local Building and Construction Authority ( BCA ) circulars to mitigate risks like ground movement, pile heave, and premature termination.