Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)
- 2004.03b
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- Pages.783-790
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- 2004
Stability Analysis and Application Evaluation of the Pretensioned Soil Nailing Systems
프리텐션 쏘일네일링 시스템의 안정해석 및 적용성 평가
- Kim, Hong-Taek (Dept. of Civil Engineering, Hongik Univ.) ;
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Park, Si-Sam
(Research Institute of Science and Technology, Hongik Univ.)
- Published : 2004.03.25
Abstract
In this study, a newly modified soil nailing technology named as the PSN(pretensioned soil nailing) system, is developed to reduce both facing displacements and ground surface settlements in top-down excavation process as well as to increase the global stability. Up to now, the PSN system has been investigated mainly focusing on an establishment of the design procedure. In the present study, the analytical procedure and design technique are proposed to evaluate maximum pretension force and stability of the PSN system. Also proposed arc techniques to determine the required thickness of a shotcrete facing and to estimate probability of a failure against the punching shear. Based on the proposed procedure and technique, effects of the radius of a influence circle and dilatancy angle on the thickness of a shotcrete facing, bonded length and safety factors arc analyzed. In addition, effects of the reduction of deformations expected by pretensioning of the soil nails are examined in detail throughout an illustrative example and