Evaluation of Stability for Pressurized Grouting Soil Nailing with Fabric Form

The pressurized grouting technique has been variously applied to many soil structures. Also, the soil nailing system as a permanent slope reinforcement has been used with the various facing methods and pressurized grouting technique. However, most design of the pressurized grouting technique for the soil nailing system have been carried out empirically because of the complicated mechanisms associated with the behavior of surrounding soils and hardening process of cement grout. Therefore, in this study, a newly modified soil nailing technology named as PGSN (Pressurized Grouting Soil Nailing) system with fabric form was applied to verify the increase of the global stability of slope. Therefore, the numerical analyses were performed to evaluate potential failure surface and minimum safety factor considering the facing stiffness and expanded radius of cemented grout using SSR(Shear Strength Reduction) technique. In addition, to compare the radius of expanded hole by theoretical equation with the one by finite element method, was used. The global stability of slope was investigated by applying the radius of expanded hole to limit equilibrium method(Talren 97) and finite different method(). As a result of applying fabric form and pressurized grouting, the global safety factor of slope was increased more than the conventional soil nail.