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Stability Analysis and Design of the Pretension Soil Nailing System  

Park Si-Sam (Technical Division, LG Engrg. & Construction Corp.)
Kim Hong-Taek (Dept. of Civil Engrg., Hongik Univ.)
Choi Young-Geun (iCONTEC Co., Ltd.)
Publication Information
Journal of the Korean Geotechnical Society / v.20, no.7, 2004 , pp. 197-206 More about this Journal
Abstract
The ground anchor support system may not be occasionally used because of space limitations in urban excavation sites nearby the existing structures. In this case, soil nailing system with relatively short length of nails could be efficiently adopted as an alternative method. The general soil nailing support system, however, may result in excessive deformations particularly in an excavation zone of the existing weak subsoils. Pretensioning the soil nails then could play important roles to reduce deformations mainly in the upper part of the nailed-soil excavation system as well as to improve local stability. In this study, a newly modified soil nailing technology named as the PSN (Pretension Soil Nailing), 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 analytical procedure and design technique are proposed to evaluate maximum pretension force and stability of the PSN system. Also, proposed are 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 are analyzed. In addition, effects of the reduction of deformations expected by pretension of the soil nails are examined in detail throughout an illustrative example and the $FLAC^{2D}$ program analysis. And a numerical approach is proposed PSN system using the shear strength reduction technique with the $FLAC^{2D}$ program.
Keywords
Bonded length; Influence circle; Pretension force; Pretension soil nailing system; Punching shear;
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