Engineering Hazard Evaluation of Active Faults and Research on the Method of Tunnel Anti-Dislocation

Abstract eng:
In recent years, many investigations showed that underground constructions have suffered severe seismic damage during large earthquakes, and the tunnels intersected with active faults were one of the typical cases. Therefore, how to accurately ascertain the damage effects of dislocations and the way they act on the structures are the key issues for tunnel design and construction. First, based on the study of the 2008 Wenchuan earthquake, the destructive law between the tunnel damage degree and the distance towards active faults was established. We selected and defined some faults to be the “Engineering Faults”, meaning that they could cause direct damage to the engineering constructions. Next, aiming at the western area of China, we classified the fault types into strike-slip, dip-slip and strike-dip & dip-slip and established the regression relationships between the earthquake magnitudes and the fault parameters. Then, the structural behavior and the failure mechanism of the tunnels through targeted ruptures were analyzed by the numerical simulation method of the 3D geological model with dynamic finite element model. These established models could reflect the non-linear stress-strain features accurately since the analysis was shown to perform well to assess the tunnel behavior against severe seismic circumstance. Based on the results, the methodology for determining the anti-seismic joint and fortification design techniques were developed, which could take the flexibility and rigidity concept into consideration simultaneously and allow the underground constructions to have a better seismic resistance when passing the active faults. This paper provided a reference for the similar engineering constructions.

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