Low noise, near-zero vibration, prevents structural damage nearby. Bored Piling with Rock Sockets
: Utilizing the Wave Equation Analysis of Piles (WEAP) to ensure driving stresses do not crack precast elements. 5. Quality Control, Testing, and Validation
The Geotechnical Society of Singapore (GeoSS) provides key guidelines on pile foundation design and construction, focusing on Performance-Based Pile Design (PBPD), Kentledge method load tests, and jacked pile protocols tailored to local geological conditions. These practices, integrated with Eurocode 7 (SS EN 1997), outline specific requirements for resistance parameters, concrete stress, and settlement limits to ensure structural safety. For a detailed overview of guidelines on jacked piles, review this Scribd document Kentledge Method for Pile Load Testing | PDF - Scribd Always consult the specific local Code of Practice (e
This guide is for educational purposes and summarizes general local practices. Always consult the specific local Code of Practice (e.g., Hong Kong Buildings Department Code of Practice for Foundations) and relevant GEO Publications for legally binding requirements.
Engineers use GEOSS data to identify regional seismicity, groundwater fluctuations, and historical land subsidence. This macro-data helps predict how local soils will interact with deep foundation elements over time. Risk Mitigation focusing on Performance-Based Pile Design (PBPD)
Tracks millimetre-scale ground deformation and historical surface settlement over time.
| Local misconception | GEOSS correction | |---------------------|------------------| | “We have always used 1.5 m spacing – it works.” | Spacing must be calculated (typically 3–4 diameters) to avoid group effects. | | “Local soil is strong – no need for load test.” | Load tests are mandatory regardless of local belief. | | “Dynamic formulas are accurate for our driven piles.” | Only if calibrated by local dynamic monitoring (PDA). | | “Bored piles are always safer than driven.” | Not in loose granular soils – driven piles densify, bored piles loosen. | Kentledge method load tests
: Strict limits are placed on allowable pile top settlements: 15 mm under 1.5 times the working load. 25 mm under 2.0 times the working load. Local Construction Practices
No guideline is without debate. Critics raise three points:
: Focuses heavily on the Ultimate Limit State (ULS) for structural safety and the Serviceability Limit State (SLS) to limit excessive settlement.
: The allowable concrete compressive stress for bored piles is generally limited to 7.5 MPa .