Dynamic Analysis for Railway Tunnel at Karakore
| dc.contributor.advisor | Henok, Fikre (PhD) | |
| dc.contributor.author | Tequamework, Assefa | |
| dc.date.accessioned | 2019-06-01T09:55:17Z | |
| dc.date.accessioned | 2023-11-04T15:16:47Z | |
| dc.date.available | 2019-06-01T09:55:17Z | |
| dc.date.available | 2023-11-04T15:16:47Z | |
| dc.date.issued | 2017 | |
| dc.description.abstract | In this research thesis an attempt is made to contribute towards a better understanding of seismic response of deep tunnel using the specific case of the railway tunnel at Karakore, located in one of the active seismic zones of Ethiopia known as escarpment seismic zone. Since stresses due to seismic action on underground structures depend on the seismic ground deformation, the characteristics of ground deformation induced by ground shaking need to be clarified. Therefore, to model the existing situation in a better way and to have good results regarding the deformations induced by the seismic action, finite element analysis has been conducted using the PLAXIS software. The effect of vertically propagating shear wave has been considered as it is expected to be the destructive type of wave for the tunnel under consideration. Probabilistic seismic hazard analysis and deaggregation has been done so as to obtain the most likely scenario of earthquake causing peak ground acceleration with 10% and 2% probability of exceedance in 50 years. Peak ground acceleration of 0.36g and 0.87g has been obtained from seismic hazard analysis, for 10% and 2% probability of exceedance, respectively. Two pairs of design ground motion; one with magnitude of 5.6 and radius of 20km and the other with magnitude of 5.7 and radius of 33km has been the result of deaggregation process. Ground motion from PEER ground motion database has been selected using the design ground motion having a magnitude of 5.6 and radius of 20km, shear wave velocity and fault mechanism of the area. The selected ground motion data points have been scaled to the peak ground acceleration specified for the site with the 10% probability of exceedance. Full dynamic analysis has been performed to refine the seismic analysis using numerical method. Transversal deformation has been the focus of this analysis and since 2D analysis has been performed, longitudinal deformation has not been considered except for the analytical case.Besides incremental stresses due to earthquake has been calculated assuming linear superposition of dynamic stresses on static stresses. The incremental stresses and strains due to earthquake are compared with unreinforced concrete support capacity and found above the threshold values. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/18385 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Railway Tunnel | en_US |
| dc.subject | Karakore | en_US |
| dc.subject | Dynamic Analysis | en_US |
| dc.title | Dynamic Analysis for Railway Tunnel at Karakore | en_US |
| dc.type | Thesis | en_US |