Evaluation of Seepage Force and Overall Stability Factor Along Proposed Baghdad Metro Tunnel Across Tigris River

Baghdad Metro is a vital project to fulfill the rapidly increased traffic volume requirements. The proposed metro will connect both sides of City, passing under Tigris River. This study employed finite elements software (PLAXIS 3D) evaluate seepage force developed around sub-river segment during different construction stages and for other water levels Tigris. found that when level changes from maximum minimum, decreases by (8 13%) (22 27%) respectively. forces were be excavation stage. concrete lining process led noticeable reduction in at all locations. also implemented strength theory assess overall stability tunnel. shows factor was minimum process. As decreased, (5% - 8%).