A discrepancy between observed and predicted NATM tunnel behaviors and updating: a case study of the Sabzkuh tunnel
作者： Majid Taromi , Abbas Eftekhari , Jafar Khademi Hamidi , Ali Aalianvari
DOI: 10.1007/S10064-016-0862-X
关键词:
摘要: The 11 km long Sabzkuh water conveyance tunnel is under construction using conventional and boring machine tunneling techniques in the Zagros Mountains of south west Iran. During excavation section (i.e., 350 m), three daylighting collapses occurred tunnel, large sinkholes developed at ground surface, due to both poor conditions inappropriate selection support class (ESC). In this study, influence ESC on response stability was investigated through dimensional (3D) finite difference element methods. analysis results numerical modeling indicated that face would be stable if a single stage (full face) an advance step 1.5 m (defined as ESC#1) were applied. However, reality different, collapsed soon after only 35 m away from portal. Having changed by taking into account new geological geotechnical data obtained mapping, field survey surface cavity, trench rate satisfactory (1.5 m/day) despite many challenges encountered. This paper presents brief review some key faced design, including characterization conditions, appropriate design parameters, evaluation installation sequence based monitoring analyzing behavior during construction. discrepancy between predicted observed practical considerations, are also discussed.
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