This guide is based on the standards and methodologies commonly adopted by the of Hong Kong and widely referenced throughout the region as "GEOSS" (Geotechnical Engineering Office Standard Summaries) or local geotechnical guidance.
6.4 Handling of obstructions and rock sockets
The guideline also includes a checklist for site use and a template calculation sheet for point load testing on irregular rock lumps. By providing clear, objective criteria, the document reduces contractual disputes and ensures that piles are socketed into genuinely competent rock in accordance with the QP’s design intent.
While the guidelines provide clear, often mandatory requirements for plan submissions, they also explicitly preserve the role of professional engineering judgment. Qualified Persons are reminded to “exercise their professional engineering judgment in design and supervision and undertake appropriate evaluation and implement suitable measures” to meet the objectives of the regulations. Where circumstances are complicated or ground conditions are highly variable, QPs are expected to incorporate more stringent or additional requirements. This guide is based on the standards and
5.2 Settlement analysis
Instead of SPT, GEOSS prescribes “dynamic cone penetrometer” (DCP) – a cheap, locally fabricated tool. Results: 0-2m soft silt (N=4), 2-5m stiff laterite (N=18), 5-7m weathered shale (refusal).
As Singapore and other urban centres continue to build upward and underground, the importance of robust, locally‑adapted foundation guidelines will only grow. The GeoSS framework stands as a benchmark for what can be achieved when professional societies, government agencies, and industry practitioners unite around a common goal: foundations that are safe, reliable, and resilient—even in the most challenging ground conditions. For the consulting engineer
: Areas with marine clay require designers to account for negative skin friction (downdrag) caused by consolidating soil layers. Bentonite or polymer slurries are often required to maintain borehole stability.
The foundation is built at 40% cost of a bored cast-in-situ pile from the capital city. After 3 monsoons, no differential settlement reported.
This crowdsourced knowledge becomes the backbone for region-specific design charts. when properly documented and slightly adjusted
For the consulting engineer, adopting GEOSS means spending less time enforcing impractical specifications and more time calibrating empirical formulas to the soil under their boots. For the local contractor, it provides confidence that their grandfather’s method, when properly documented and slightly adjusted, can stand up to modern scrutiny.
Selecting the correct pile type and installation method is critical to minimizing cost, preventing structural damage, and mitigating environmental impact on neighboring structures. Driven Piles
This ensures functionality under working loads. Local practices typically dictate strict allowable pile-top settlements—often limited to 15 mm under 1.5 times the working load and 25 mm under 2.0 times the working load during testing. Structural Calculations for Bored Piles