The Safety Factor and Deformation on the Slope by Soil Nailing Reinforcement in the Water Saturation Condition

The condition of groundwater level in the slope is generally deep enough located and it is far from outermost surface slope, so in the slope reinforcement design that uses soil nailing, sometimes the influence to the safety factor is not considered, because slope is assumed that it will not experience water saturation. This research intends to investigate the value of safety factor and deformation that happen on soil nailing when the slope experiences the increasing of groundwater level. The methodology consists of analyzing by finite element with Plaxis software. The research method is carried out by using the finite element method that is the numerical simulation which is assisted by the software Plaxis, and is started by modelling the existing condition without soil nailing reinforcement formerly, then it is continued with modelling the existing condition by using soil nailing reinforcement. The researched parameter is groundwater level that is geometrically modelled by Plaxis with a depth of 2m on toe and 4m on hoe. The result shows that the safety factor value of slope by using soil nailing that experiences the increasing of groundwater level will experience a slight decrease, but the deformation in the slope land will be more increasing. Part of soil nailing that is caught water saturated is needed to be attended because the big pore water pressure more happens in the part.