Geoss Good Practice For Installation Of Jacked Foundation Piles In Singapore -

| Formation | Characteristics | Jacked pile suitability | |-----------|----------------|------------------------| | | Soft to firm, high compressibility | Good – full displacement helps densify | | Kallang Formation | Soft clay, peaty layers, sands | Good with sleeve or lubrication | | Old Alluvium | Dense to very dense, silty sand | Difficult – may need pre-boring or limited depth | | Jurong Formation | Weathered sedimentary rock | Requires shoe and high jacking force |

Introduction Jacked foundation piles (mechanically jacked or hydraulically jacked) are widely used in Singapore’s dense urban environment for load-bearing support where vibration-sensitive or low-noise installation is required. Good practice combines careful planning, compliance with local regulations and standards, sound geotechnical assessment, precise execution, monitoring, and environmental and safety controls. The following essay outlines best practices across project phases tailored to Singapore’s soil conditions, regulatory environment, and typical urban constraints. | Formation | Characteristics | Jacked pile suitability

: While considered construction-friendly, the mobilized shaft and base resistance in this formation can vary. GeoSS recommends caution when using load test results from adjacent sites, as workmanship significantly impacts these values. : While considered construction-friendly

Jacked foundation piles are a popular choice for building foundations in Singapore due to their high load-bearing capacity and relatively fast installation process. However, improper installation techniques can lead to defects, delays, and cost overruns. This article outlines the good practices for the installation of jacked foundation piles in Singapore, highlighting the key considerations and best practices to ensure a successful project. compliance with local regulations and standards