Benchmark solution
=====================

The result of the macro command POST_NEWMARK is compared to other methods of estimating the safety factor, based on the Potgieter results [:ref:`1 <1>`]:


* Slice method using the SLOPE /W software


**Enhanced Limit Equilibrium* by SIGMA /W and SLOPE /W software


* C-phi reduction by the PLAXIS 2D software.

The approach used by the POST_NEWMARK macro command is similar to the *Enhanced Limit Equilibrium* method and the results should be as close as possible to this method.

The reference values obtained by Potgieter [:ref:`1 <1>`] for these three methods are as follows:


* Slice method: FS = 1.73


**Enhanced Limit Equilibrium*: FS = 1.82


* c-phi reduction: FS = 1.72