In case of underground construction affected by groundwater, CIP (Cast-In-Place Pile) method is generally used to resolve the geo-hydraulic problem. However, as this method has poor connectivity between piles, an auxiliary method for cut-off is needed in many cases. In this study, a new concept earth retaining wall method (H-CIP) with no auxiliary method, by using surfactant grout (Hi-FA) which improves antiwashout and infiltration ability, is introduced, and its field applicability is evaluated. CIP and H-CIP piles were installed with same ground conditions, and field permeability tests were conducted to verify the performance. As results, newly contrived H-CIP method shows higher antiwashout performance for cut-off than conventional CIP method.

ABSTRACT
 1. 서 론
 2. 신개념 흙막이 공법(H-CIP)
  2.1 Hi-FA 그라우트
  2.2 CIP 공법과H-CIP 공법
 3. 현장 실험
  3.1 말뚝 배치
  3.2 차수능 평가
 4. 결 론
 References

• 박봉근(㈜백경지앤씨) | Park Bong-Geun
• 이주형(한국건설기술연구원) | Lee Ju-Hyung