Dynamic Stability of Reinforced Slope Using New-Mark and Distinct Element Method
Tatsuaki NISHIGATA, Kei AZEGAMI and Kenichi KATAOKA
Abstract:Static design for soil nailing is based on both of the effects of tensile force developed in reinforcement (internal stability) and overall stability of reinforced zone (external stability). Authors have already obtained the result that external stability due to restraint effect is more important for the actual design of reinforced cut slope in the ordinary condition. On the other hand, usual design method takes no consideration of the stability under seismic load condition, so it is necessary to identify the behavior of the reinforced structure under seismic loading. Present study employed New-Mark method and distinct element method to investigate behavior of the reinforced slope due to seismic loading. Finally, following conclusions were obtained. If the reinforcement installed at the interval that the restraint effect sufficiently works in the ordinary condition, the deformation of the reinforced slope under the seismic loading is controllable to small value, and the stability may be guaranteed. Key Words:Soil nailing, Cut slope, Restraint effect, New Mark Method, Distinct element method