: Piles must be designed to transfer structural loads through either end-bearing (to hard stratum) or friction (skin resistance).
| Local Skill Level | Typical Local Practice | GEOSS Recommended Pile Type | Construction Quality Check | |------------------|------------------------|-----------------------------|----------------------------| | High (trained crews) | Rotary bored piles | CFA or large-diameter bored | Cross-hole sonic logging | | Medium (general construction) | Hand-dug caissons | Driven precast concrete piles | Hammer energy monitoring | | Low (informal labor) | Timber/bamboo driven piles | Micro-piles or Franki piles (compacted concrete) | Load test every 20 piles |
The guidelines mandate specific requirements for ground investigation, load testing, and quality control testing for deep foundations. Notably, QPs must exercise independent judgment on whether more stringent requirements should be adopted where ground conditions could be adverse or highly variable. : Piles must be designed to transfer structural
By 2028, the goal is to reduce foundation costs in developing regions by 30% while lowering failure rates by 50%.
[ q_p,local = k_loc \times q_p,standard ] By 2028, the goal is to reduce foundation
Proper installation is as critical as the design. GeoSS and associated industry best practices highlight the following: 2.1 Bored-and-Cast-in-Place Piles
In jurisdictions using digital submission systems (like the GEOSS platform in Hong Kong), specific protocols apply: Buildings are categorized as high, medium, or low
A distinctive feature of the GEOSS framework is its , particularly evident in the raft and piled-raft foundation guidelines. Buildings are categorized as high, medium, or low risk based on:
Recognizes that local builders practice "pre-wetting" and "ponding" before pile installation. The guidelines codify this as the : a 72-hour pre-construction wetting to 80% saturation, followed by CPT testing to measure collapse strain. Pile shaft resistance is then derated using a collapse potential index (Ic).
Key differences between GEOSS and AASHTO approaches include: