The Application of Rapid Load Testing in Singapore-Paper

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The paper evaluates Rapid Load Testing (RLT), including Statnamic and StatRapid, as a faster, less costly, and less space-intensive alternative to Static Load Testing (SLT) for foundation piles in Singapore. RLT applies a short-duration load that moves the pile approximately as a whole; the Unloading Point Method (UPM) estimates equivalent static resistance when pile velocity reaches zero, without requiring subjective signal matching.<br /><br />The authors compare RLT and SLT results from three Singapore projects, using different testing sequences and, in one case, neighboring piles. Across the case studies, results correlated well when comparisons accounted for differences between virgin and subsequent loading cycles, including permanent residual settlement from prior tests. For piles of different diameters, settlement was normalized by pile diameter.<br /><br />The tested piles obtained most of their capacity from dense or very stiff sandy soils, residual soils, or rock. In these conditions, loading-rate effects were negligible, and the RLT results approximated SLT results without applying rate-correction factors. This was also observed where soft clay occurred in the soil profile, provided the pile capacity was primarily derived from competent material.<br /><br />The authors conclude that RLT can provide consistent, user-independent estimates of pile load–settlement behavior and may replace SLT where site-specific correlations and applicable requirements support its use. Careful interpretation of loading history and soil conditions remains essential; the findings should not be generalized to piles whose capacity is mainly derived from rate-sensitive cohesive soils.

Keywords

Rapid Load Testing

Statnamic

StatRapid

Static Load Testing

foundation piles

Unloading Point Method

pile load-settlement behavior

Singapore projects

loading-rate effects

soil conditions