Subway support system selection by TOPSIS method (Case study: Tehran subway line3phase4)

The aim of this paper is to offer a useful design to specify and choose suitable options for Tehran subway tunnel supports, line 3, phase 4 as a good model for later stages use. This pattern is formed on the basis of technical, financial, administrating, social and political and mechanical and effective factors on the site of doing the project by noticing a variety of criteria. Furthermore (on the other hand) subway tunnel supports include lattice girder,cement armed with armature using modular form work (frame work) system, fore poling, corrugated steel sheet and segmental lining in the model. And the final goal is selecting the most suitable option aimed all the probable options for choosing subway tunnel supports system and noticing effective and important criteria on which basis and by using multi-criteria decision making and new research methods during the operation, proper options are prioritize and ultimately the best ones are chosen. In TOPSIS method, alternative (E) is selected as the best alternative for support system.