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Study on Structural Damage Characteristics of Tunnels Crossing Active Faults Based on Layered Dislocation Theory
(1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074; 2. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074)
Abstract To investigate the damage characteristics of tunnel structures under fault dislocation, a model for tunnels crossing faults was developed based on layered dislocation theory and a concrete incremental elasto-plastic damage model. The damage characteristics of lining structures under different conditions were analyzed, and the model's accuracy was verified using actual engineering cases. The results indicate that: Composite linings struggle to resist large-scale dislocation. For the case study tunnel, the composite lining structure at the fault failed under moderateto-strong seismic events with a magnitude of Mw=5.0~5.2; With changes in the fault dislocation angle, the tensile and compressive damage zones of the lining structure shift correspondingly. Tensile damage zones align with the direction of fault dislocation, while compressive damage zones are perpendicular to the dislocation direction; Strikeslip dislocation causes more severe damage to lining structures compared to dip-slip dislocation; With increasing burial depth, the damage zones of the lining structure gradually concentrate near the fault and the haunches of the lining.
Abstract：
To investigate the damage characteristics of tunnel structures under fault dislocation, a model for tunnels crossing faults was developed based on layered dislocation theory and a concrete incremental elasto-plastic damage model. The damage characteristics of lining structures under different conditions were analyzed, and the model's accuracy was verified using actual engineering cases. The results indicate that: Composite linings struggle to resist large-scale dislocation. For the case study tunnel, the composite lining structure at the fault failed under moderateto-strong seismic events with a magnitude of Mw=5.0~5.2; With changes in the fault dislocation angle, the tensile and compressive damage zones of the lining structure shift correspondingly. Tensile damage zones align with the direction of fault dislocation, while compressive damage zones are perpendicular to the dislocation direction; Strikeslip dislocation causes more severe damage to lining structures compared to dip-slip dislocation; With increasing burial depth, the damage zones of the lining structure gradually concentrate near the fault and the haunches of the lining.
HUI Qiang1 GAO Feng1,
2 TAN Xukai1 YOU Dongmei1
.Study on Structural Damage Characteristics of Tunnels Crossing Active Faults Based on Layered Dislocation Theory[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(6): 35-44
2024, Vol. 61 