Geoss Guidelines On Local Practices For Pile Foundation — Design And Construction ((better))

: Capped at 7.5 MPa under older standard norms, or customized via the characteristic cylinder strength ( fckf sub c k end-sub ) factoring under Eurocode 2 details.

A faster, more cost-effective alternative utilizing High-Strain Dynamic Testing (PDA). It uses wave mechanics to estimate capacity and assess structural integrity immediately after driving. Low-Strain Integrity Testing (PIT)

– In limestone areas, the risk category assigned during design dictates not only the intensity of site investigation but also the construction measures required, including whether cavity treatment must be carried out before piling, what contingency steps are in place if cavities are encountered, and what testing and submission requirements apply.

The allowable concrete compressive stress for bored piles is often limited to Geological Considerations In soft formations like the Kallang Formation , designs must account for negative skin friction (down-drag forces) caused by consolidating soil layers.

: Necessary integrity tests must be conducted by specialist builders to prove the piles are of high quality and free of structural defects. Equipment Management

Singapore’s western region sits on challenging limestone ground, where hidden cavities (karstic formations) can complicate piling works. Karst terrain presents unique risks: bored piles may encounter voids that reduce end bearing capacity, cause unexpected loss of concrete during casting, or lead to sudden collapse. The inherent unpredictability of karst geology means that even extensive site investigations may not detect every cavity.

Highly favored in soft clays and silts for providing a continuous profile of tip resistance and pore water pressure.

The Geotechnical Society of Singapore (GeoSS) is a professional organization dedicated to advancing the practice of geotechnical engineering in Singapore. It serves as a key platform for knowledge exchange, technical training, and the development of industry guidelines. GeoSS works closely with government agencies—most notably the Building and Construction Authority (BCA)—as well as with other professional bodies such as the Institution of Engineers Singapore (IES), the Association of Consulting Engineers Singapore (ACES), and the Singapore Contractors Association Ltd (SCAL).

The GeoSS‑BCA EC7 Briefing (19 November 2014) provides an overview of key aspects of ground investigation and the determination of characteristic values according to Eurocode 7. The briefing covers:

The guidelines reflect a collaborative industry effort, with contributions from BCA, HDB, LTA, MOM, SCAL, and multiple specialist piling contractors.