نوع مقاله : مقاله پژوهشی
نویسندگان
1 کارشناس ارشد مکانیک سنگ، دانشکدهی مهندسی معدن، نفت و ژئوفیزیک، دانشگاه شاهرود
2 استادیار، دانشکدهی مهندسی معدن، نفت و ژئوفیزیک، دانشگاه شاهرود
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Evaluation of interaction between new and existing underground spaces is one of the important problems in tunneling in urban areas. In some cases it is necessary to excavate tunnels close to each other’s. This, in turn, will lead to important interaction between these tunnels. In this paper, using 3D numerical modeling of line 1 twin tunnels of Tabriz urban railway, excavation stability of these tunnels, using critical strain of Sakurai, have been studied. Also displacement pattern of lining in both twin tunnels (Sahand & Sabalan) have been investigated. In next step, effect of excavation of these tunnels on the subsidence of surface and adjacent buildings, using Cramer criteria and finite difference method (FLAC 3D), have been studied. For the purpose of study of the interaction effects between these tunnels, forces and moments that act on the segmental lining of each tunnel and their safety factor have been verified. Eventually, stability of pillar that lies between two tunnels, have also been evaluated. The results show that: 1-twin tunnels of Tabriz metro will be stable during excavation. 2-Surface subsidence due to excavation of these tunnels will have no important effect on existing structures.3-Safety factors varies between 5-10 on the different positions of segmental lining. 4- Pillar that lies between twin tunnels will be stable