The statnamic load test (STN) has gained popularity as an alternative pile load testing method in Southeast Asia compared with the conventional static load test (SLT). Owing to the local geological conditions and regulation requirements, drilled shafts in Malaysia and Singapore are basically designed to pass through a layer of soft soil at the upper part of the pile and then socketed into the stiff residual soil/old alluvium/weathered rock. Thus, these piles mobilize relatively higher skin friction near the bottom of the pile with a strong end-bearing component. The rate effect of friction piles under rapid loading that is usually exhibited in stiff clay is found to be insignificant, which allows the unloading point method to work reasonably well to derive the static-equivalent capacity of the pile. Furthermore, the test load usually is still much lower than the real ultimate capacity. Thus, the load-settlement response obtained from the STN is basically identical to the SLT response without any further correlation. To date, there are limited case references on correlation work for these kind of piles. Therefore, we performed a comparison study to evaluate the SLT and STN on two instrumented piles that were installed within a similar soil profile but different in working load, diameter, and length. In this comparison study, the load-settlement behavior and load-transfer curve were evaluated. The correlation between the two tests was found to be excellent in terms of specific settlement values at a specific load, normalized load-settlement response, and normalized load-transfer curve. The normalized load-settlement and normalized load-transfer curve were found to be consistent between the SLT and STN. Hence, it could be concluded that the STN provided a good alternative for a conventional SLT, at least for this category of drilled shafts.
Author Information
Chew, Soon, Hoe
University of Singapore, Dept. of Civil and Environmental Engineering, SG
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