Nowadays, creating excavations with different depths for the construction of tall buildings and important structures is inevitable. This issue is of great importance in urban areas, given the shortage of land and the presence of buildings and facilities around the excavation site. Inaccuracy in the design and calculation of excavation protection methods and the implementation of excavations in these areas may lead to irreparable human and financial losses, especially to structures adjacent to the excavation. Truss guard structure is one of the most suitable and common methods of excavation protection in urban areas. The use of finite element software, given the extraordinary features and facilities of these software, is of considerable importance in identifying the behavior of excavations and analyzing the behavior of structures adjacent to the excavation. In the design and calculations of guard structures, simplification is of great use in initial estimates and even final evaluation, and ready-made maps are widely used in this field. So far, the effect of the method of equating the properties of multilayered soil in the design and control of deformation of guard structures has not been investigated. In this research, a truss guard structure in multilayer soil was designed and its deformation was calculated using finite element modeling. Then, the deformation of this guard structure in a single-layer soil was designed and calculated using the properties obtained for the soil from the weighted averaging, moment and minimum methods. The results of this research show that the best method of equivalence was based on the height of the guard structure and the condition of the soil layer.