SHI Xinwei,FENG Xin,FAN Zhe.Damage Evolution Analysis of Composite Lining Convey Tunnel under Reverse Fault[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1132-1140.
SHI Xinwei,FENG Xin,FAN Zhe.Damage Evolution Analysis of Composite Lining Convey Tunnel under Reverse Fault[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):1132-1140. DOI: 10.13409/j.cnki.jdpme.20220413003.
Damage Evolution Analysis of Composite Lining Convey Tunnel under Reverse Fault
The composite lining is a new type of water conveyance tunnel lining structure that can withstand high internal pressure but may be damaged due to fault dislocation when crossing the fault zone. Therefore, it is of practical significance to analyze the damage evolution of composite-lined water conveyance tunnels passing through reverse faults. By considering multiple loads and the separation mode between different structural layers, a three-dimensional finite element model of composite-lined water conveyance tunnel-fault was established to study the damage evolution process of composite lining structures under different dislocation displacements of reverse faults, and to quantitatively assess the damage status. The numerical results show that the damage to composite lining structure under the action of reverse fault is divided into three stages: shear damage, tensile damage, and failure damage. The failure of the steel tube at the sidewall of the sliding surface arch under the coupling effect of bending instability and local buckling is the final failure mode of the composite lining structure, the damage range and sliding surface extend to the two plates in the “X” distribution. Due to differences in the properties and bonding properties of different materials, the fault action leads to the detachment phenomenon between different structural layers, and the detachment distance is positively correlated with the dislocation displacement. The separation between concrete and the steel tube differs from the continuous distribution between concrete and surrounding rock, which is mainly concentrated near the steel tube stiffener. The steel tube reduces the risk of internal water leakage caused by concrete cracking, enhances the resistance of composite lining structure to fault dislocation, and improves the safety margin of water conveyance tunnel structures.
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