Comparative Study of the Field Performances of Pressure-Grouted Micropiles Using Gravity and Packersopen access
- Heo, Ong; Yoon, Yeowon; Jinung
- Issue Date
- pressure-grouted micropiles; gravitational grouting; geotextile packer; rubber packer; tension load test; creep test
- APPLIED SCIENCES-BASEL, v.11, no.15
- Journal Title
- APPLIED SCIENCES-BASEL
- When underground space requires excavation in areas below the water table, the foundation system suffers from buoyancy, which leads to the uplifting of the superstructure. A deep foundation system can be used; however, in cases where a hard layer is encountered, high driving forces and corresponding noises cause civil complaints in urban areas. Micropiles can be an effective alternative option, due to their high performance despite a short installation depth. Pressurized grouting is used with a packer to induce higher interfacial properties between micropile and soil. In this study, the field performance of micropiles installed using gravitational grouting or pressure-grouted using either a geotextile packer or rubber packer was comparatively evaluated by tension and creep tests. Micropiles were installed using pressure grouting in weak and fractured zones. As results, the pressure-grouted micropiles showed more stable and stronger behaviors than ones installed using the gravitational grouting. Moreover, the pressure-grouted micropile installed using the rubber packer showed better performance than the one using the geotextile packer.
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- 해양과학대학 > 해양토목공학과 > Journal Articles
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