TN71 : Dynamic analysis of Tabriz urban railway tunnels line 1 using numerical modeling
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2008
Authors:
Akbar Salemi [Author], Farhang Sereshki[Supervisor], Mohammad Ataei[Supervisor], Fariborz Salehi Alee [Advisor], Saleh Balideh [Advisor]
Abstarct: This dissertation quantitatively considers qualitative effect of different levels of earthquake on urban structures such as metro tunnels. Main aim of this research is studying concrete lining behavior of circular shallow tunnels in sedimentary urban area under seismic loads. Tabriz Urban Railway Tunnels were studied as a case study. Seismic and geotechnical characters of area were studied and a static analyzing carried out using confinement-convergence and ground response cure resultant of FLAC2D. Safety factors of critical parts of concrete lining of tunnel under static loads evaluated by using axial force-bending moment interaction curve. Also in static analyzing section, a method for modeling of non-uniform hybrid segmental lining of circular tunnels excavated by TBM presented by using sensitive analyzing of effective parameters on bending moment in joints. The results were verified by SAP2000 software as well as FLAC2D software. Then dynamic analyzing of case study was carried out using scaled accelogram and seismic investigation of sedimentary for selected sections in Design baxse Level and Maximum Credible Level of earthquake. In this stage, static model was modified and dynamic specification of soil and accelogram were applied on model without sliding to evaluate dynamic response. Time history of SAP2000 and analytical solutions were used to verify results of FLAC2D. Finally performance of implemented lining and safety factor of critical parts of tunnel were evaluated considering all of the static and dynamic loads applied on model and combination coefficient of seismic design level. In conclusion, analyzing results show good performance of concrete lining under combined loads of seismic design levels. Therefore the objectives of designing satisfied in this analysis.
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