Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)
- 2009.03a
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- Pages.368-375
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- 2009
Verification Studies for Field Peformance of Micropiling
성능검증을 위한 마이크로파일 현장 시험시공 및 재하시험
- Goo, Jeong-Min (Earth&Foundation Engr. Div., Korea Institute of Construction Technology) ;
- Lee, Ki-Hwan (Civil Engineering Technology Dept., Ssangyong Engineering & Construction Co., Ltd.) ;
- Cho, Young-Jun (Dong-A Geological Engineering Co. Ltd.) ;
- Choi, Chang-Ho (Earth&Foundation Engr. Div., Korea Institute of Construction Technology)
- Published : 2009.03.27
Abstract
This paper describes field installation and load test results performed for three types of micropiles in the process of developing a new micropiling method. Field tests were performed for two conventional types(i.e., micropile reinforced with steel bar and gravity grouting, micropile reinforced with steel bar and steel casing and gravity grouting) and a proposed type(i.e., micropile reinforced with hollow steel pipe wrapped with geotextile-pack and pressurized grouting). The load test results subjected to axial compression and tension and lateral loading conditions are described in this paper. The micropiles were exposed in the air in order to verify the installation quality and curing condition of grouting material via ground excavation. Axial compression and tension test results indicate that the new micropile type provide at least 40% higher bearing capacity than that of conventional types. Based on the examination of exposed piles, it is induced that the proposed method, packed micropile, provides better interlocking between grouts and surrounding soils and increases higher frictional resistance comparing to conventional types.