Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Feasibility Appraisal and Proposal of a Pile Driving Formula for Domestic Pre-bored Pile Management

국내 매입 말뚝 관리를 위한 항타공식 활용 가능성 평가 및 제안에 관한 연구

  • 김건웅 (한국건설기술연구원 지반연구본부) ;
  • 서승환 (한국건설기술연구원 지반연구본부) ;
  • 김주형 (한국건설기술연구원 지반연구본부) ;
  • 정문경 (한국건설기술연구원 지반연구본부)
  • Received : 2023.10.23
  • Accepted : 2023.11.02
  • Published : 2023.11.30
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Abstract

In accordance with Korean structural foundation design standards, dynamic or static load tests are mandated for 1 to 3% of total piles. The construction quality of the remaining 97% to 99% of piles is determined through penetration measurements. This study aims to enhance the quality control of the majority of piles by adopting a pile driving formula that considers both penetration and hammer energy. The current challenge lies in adapting existing overseas driving formulas to the domestic site conditions, characterized by shallow weathered or soft rocks, and the prevalent use of pre-bored piles. To address this, the Modified Gates formula was refined using domestic dynamic load data, thereby improving its applicability to pile management. Despite employing fewer variables, the proposed formula demonstrates a comparable accuracy to dynamic loading tests in predicting the bearing capacity of pre-bored piles. Consequently, this formula holds promise for practical use in future pile quality management.

국내 구조물 기초설계기준은 전체 말뚝 수량의 1~3%에 대해 동재하시험 또는 정재하시험을 수행하도록 규정하였다. 나머지 약 97%에서 99% 말뚝의 시공 품질은 통상적으로 항타 관입량으로 관리한다. 대다수 말뚝에 적용되는 기존 관입량 관리방식에서 항타 에너지도 함께 고려하는 항타공식으로 말뚝의 시공 품질을 관리한다면 신뢰성이 향상될 것으로 판단된다. 본 연구에서는 기존 항타공식의 국내 말뚝 관리 활용 가능성을 검토하였다. 하지만, 해외에서 만들어진 기존 항타공식들은 상대적으로 얕은 깊이에 풍화암이나 연암이 있으며 매입 말뚝을 주로 활용하는 국내 실정에 맞게 개선할 필요가 있다. 그러므로, Modified Gates 공식을 국내 데이터를 활용하여 개선하였고, 이를 활용한 말뚝 관리 가능성을 확인하였다. 개선된 공식은 적은 변수를 활용함에도, 동재하시험과 유사한 수준의 정확도로 매입 말뚝 지지력을 예측하였다. 제안된 항타공식은 향후 말뚝의 시공 품질관리에 실무적으로 잘 활용할 수 있을 것으로 기대된다.

Keywords

Acknowledgement

본 연구는 한국건설기술연구원의 목적형 주요사업 '지반분야 재난재해 대응과 미래 건설산업 신성장을 위한 지반 기술 연구(과제번호: 20230096-001)'의 지원으로 수행되었습니다. 이에 깊은 감사를 드립니다.

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