Abstract: The use of planar polymeric and metallic reinforcements in mechanically stabilized earth structures has been growing in Indonesia in the last few years. This modern technique has been evaluated to be competitive if compared to other traditional earth retaining structures and has been safely employed in strategic infrastructure development projects in Indonesia. At the same time, there is still a lack of knowledge regarding the design methodologies for the mentioned structures among Civil Engineers. At present, there are two main currents followed by Engineers in order to design reinforced soil slopes and walls: Limit Equilibrium (LE) methods and Finite Element analysis. Several LE methods have been developed for slope stability analysis in the last decades, each is based on different assumptions and hypothesis and all of them utilize the well-known Mohr-Coulomb expression to determine the available shear strength along a potential sliding surface. The aim of this paper is to present the design basis of MSE walls/slopes using Janbu modified and Bishop modified Limit Equilibrium methods. The paper describes also how to include the presence of planar reinforcements in the LE formulations for the global stability and internal stability checks according to the so called “rigid model”. Moreover, the procedure to properly calculate the long-term tensile strength of the planar reinforcements to be used in the LE formula will be presented.

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