Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)
- 2001.03a
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- Pages.469-476
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- 2001
The Hammer Energy Delivered to the Drilling Rod in the SPT 1
표준관입시험시 롯드에 전달되는 해머의 낙하에너지 평가 1
Abstract
The Ν-value in the standard penetration test(SPT) is affected by the magnitude of the rod penetration energy transmitted from the falling hammer as well as the geotechnical characteristics of the ground. Understanding of the striking energy efficiency in the SPT equipment is getting important for that reason. The energy efficiencies of the doughnut hammer with the hydraulic lift system and the automatic trip hammer system were investigated through field tests using the instrumented rod and wave-signal acquisition systems including the pile driving analyzer(PDA) . The rod energy ratio, ΕR