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Estimation of Stability for Pretensioned Soil Nailing System by using Shear Strength Reduction Technique
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전단강도감소기법을 이용한 프리텐션 쏘일네일링 공법의 안정성 평가

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Estimation of Stability for Pretensioned Soil Nailing System by using Shear Strength Reduction Technique
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In Korea, there are recently many attempts to expand a temporary soil nailing system into a permanent soil nailing system since the first construction in 1993. And the ground anchor system occasionally may not be used because of space limitations in urban excavation sites nearby the existing structures. In these cases, soil nailing system with relatively short lengths of nails can be efficiently adopted as an alternative method. The general soil nailing system, however, may result in excessive deformations particularly in an upper excavation zone of the weak subsoils. The pretension soil nailing system then, could play important roles to reduce deformations as well as to improve stability. In the present study, estimation of stability for pre tensioned soil nailed slopes including tension force is introduced by numerical technique. The numerical technique as shear strength reduction technique used for determining a potential failure surface and minimum factor of safety is proposed. Also, the parametric analysis are carried out for the typical section of pretensioned soil nailing system using FLAC^(2D) program and are compared with the results of Visual Nail program based on a limit equilibrium analysis for quantitative analysis.

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UCI(KEPA) : I410-ECN-0101-2009-532-017811074