Comparative Study of the Field Performances of Pressure-Grouted Micropiles Using Gravity and Packers

Applied Sciences

Ong Heo¹  Yeowon Yoon²  Jinung Do³ 

[1] Civil Business Center, DODAM E&C, Incheon 21558, Korea;Department of Civil Engineering, Inha University, Incheon 22212, Korea;Department of Ocean Civil Engineering, Gyeongsang National University, Tongyeong 53064, Korea;

关键词: pressure-grouted micropiles;    gravitational grouting;    geotextile packer;    rubber packer;    tension load test;    creep test;   

DOI  :  10.3390/app11156736

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown