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  Structural analysis and design for final lining bifurcations in alluvial grounds Niayesh Tunnel (Tehran, Iran)

  This paper is to present the structural analysis and design of the final lining for the bifurcations of Niayesh tunnel minimum overburden(18m) .The tunnel section considered for design has a maximum width of 30m and maximum height of 17m.The main tunnel lining is composed of a double shell lining system consisting of both initial support and final lining . It is assumed that all loads are transferred to and supported by the final lining.Considering the earthquake activity in Tehran, the final lining structure must withstand both seismic and static loads simultaneously.The soil-structure interaction approach is used for the static analysis of the final lining structure using Plaxis software considering construction sequences prior to final lining installation. The dynamic analysis is based on soil-structure interaction approach (Hashash method) using Plaxis software. In this approach, the general behavior of the final lining is simulated as a buried structure subject to ground deformations.

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