نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده مهندسی معدن، دانشگاه صنعتی شاهرود
2 دانشیار دانشکده مهندسی معدن، دانشگاه صنعتی شاهرود
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Although underground structures generally exhibit better seismic performance than surface structures, documented earthquake damage to tunnels underscores the importance of considering dynamic loads in their design. Tunnel engineering depends on the stability of the surrounding rock, influenced by the fault’s movement. Tunnels intersecting active faults in seismically active regions are vulnerable to ground displacement induced by fault rupture during earthquakes. During seismic events, tunnel concrete linings are subjected to internal forces induced by ground deformations. Accurate prediction of internal forces in concrete linings under seismic loading is essential for safe and economical design.
This study numerically investigates the stability of the concrete lining of the Alborz tunnel in Iran under both static and dynamic loading conditions, with particular emphasis on the effects of earthquake-induced ground motion and the maximum credible displacement of the Kandovan fault. Numerical simulations were performed using FLAC3D software to evaluate tunnel response under design-basis earthquake (DBE) and maximum Credible earthquake (MCE) scenarios. The structural responses in the tunnel lining including bending moment, axial force, and shear force are evaluated under seismic loading conditions. Results indicate that the tunnel remains stable under static conditions and DBE loading. However, under 30 cm maximum fault movement, significant damage occurs at the fault intersection zones, particularly at the hanging wall and footwall boundaries, leading to concrete lining rupture and structural instability. The findings underscore the critical importance of accounting for fault–tunnel interaction in the design of tunnels crossing active faults, with special attention to reinforcement strategies at fault intersection zones.
کلیدواژهها [English]
)