تعیین فاصله داری بهینه ی طاقهای بتنی و برآورد نشست در ایستگاههای مترو مطالعه ی موردی: ایستگاه هفت تیر خط 6 متروی تهران

Development of subway systems is considered as an essential need in urban areas. each line of a subway contains tunnels, stations and mid tunnel ventilation shafts. concrete arc pre-supporting (caps) system and sequential excavation, are known as standard methods for the construction of underground stations. when the process is underway, it is necessary to protect surface and underground structures from subsidence hazards. in this paper, stability analysis and settlement evaluation of haft-e-tir station of tehran metro line no. 6 have been considered. geotechnical investigations have shown that the main subsurface layer has been formed of a very dense soil.