The soil survey took place in the narrow opening of 50cm x 50cm area where existing equipment would not have fit. The hard soil was 3m below the 6m two story water reservoir. The non drilling stake indentation allowed us to see the actual strength of the soil. The micro pile compression and the original strength of the stakes were also confirmed with the JP indentation device.
Kyonghee Medical center drilling/stake indentation site survey
Non drilling indentation survey
ø600 steel stake load test, Nakdong River Busan
ø350 RC stake load test, Gumi facility 2011
The trend is similar normally, but we suspect that the N value according to the soil survey based on wet boring is over valued, and when it comes to weak clayey, the difference is even grater.