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http://dx.doi.org/10.5762/KAIS.2020.21.6.687

Horizontal Behavior Characteristics of Umbrella-Type Micropile Applied in Soft Clay Ground subjected to Seismic Motion  

Kim, Soo-Bong (Department of Civil and Environmental Engineering, Pusan National University)
Son, Su-Won (Seismic Simulation Test Center, Pusan National University)
Kim, Jin-Man (Department of Civil and Environmental Engineering, Pusan National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.6, 2020 , pp. 687-695 More about this Journal
Abstract
Micropile is used to improve the stability of existing structures as well as solve various geotechnical problems, such as suppressing slope activity and shearing keys of retaining walls. The existing micropile method has a significantly less capacity to resist a horizontal force than a vertical force0355 Therefore, it is necessary to develop and study an umbrella-type micropile method with excellent seismic performance that can secure seismic performance economically while minimizing structures and ground disturbance areas in the limited space of existing structures. In this study, numerical analysis was performed on the umbrella-type micropile, in which the sloped pile and vertical pile were combined, and the horizontal behavior in soft clay ground during earthquakes was analyzed. Numerical analysis showed that umbrella-type micropile suppresses horizontal displacement in soft ground, and the effect of reducing the horizontal displacement was more pronounced when the embedded depth of the slope pile was 15 m or more. The embedded depth of the micropile and horizontal displacement suppression effect was proportional. Therefore, the umbrella-type micropile has an excellent effect of suppressing horizontal displacement during earthquakes on soft clay ground.
Keywords
Umbrella-Type Micropile; Horizontal Behavior; Dynamic Analysis; Numerical Analysis; Soft Clay;
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