考虑海蚀作用的水下盾构法隧道地震破坏机理及抗减震措施研究

随着我国沿海地区经济的发展和跨江海交通需求的增长，海域公路、铁路、城市地铁水下盾构隧道日益兴建。这些隧道处于近海复杂地质地层之中、长期遭受海洋环境侵蚀，并随时面临强震的威胁，发生结构破坏的风险极大。本项研究结合海域复杂环境水下盾构隧道特点，针对遭受海蚀作用的既受腐蚀衬砌结构的抗震性能、破坏机理与抗减震措施开展研究，从海蚀作用下水下盾构隧道衬砌结构的腐蚀劣化特征与损伤演化规律出发，研究既受腐蚀衬砌结构损伤在地震作用下的放大效应与演化机理，揭示地震作用下既受腐蚀衬砌结构的损伤变异机制；探明既受腐蚀单层管片衬砌结构、既受腐蚀单层管片衬砌+新筑二衬结构等在不同锈蚀状态、不同地震强度下的动力响应特性与破坏机理；并基于不同腐蚀状态的结构抗震性能，建立既受腐蚀衬砌结构的劣化状态分区，开发不同劣化状态下既受腐蚀盾构隧道衬砌结构的加固处理与抗减震处置措施，以保障海域水下盾构隧道衬砌结构的耐久与长期运营安全。

With the rapid development of economy in coastal areas and the increasing demands for traffic infrastructure across river and sea, a large number of underwater shield tunnels are going to be constructed for highways, railways and subway in marine areas. These tunnels are always built in offshore complex geological ground, suffering long-term erosion of the marine environment, and have to face the threat of strong earthquakes at any time, so their lining structures are always in great risk of damage. This research considered the feature of underwater shield tunnel in complex marine environment, is conducted against the seismic behavior, seismic failure mechanism and aseismic measures for corroded and deteriorated lining structure suffering marine erosion. It starts from the deterioration characteristics and structural damage evolution of lining structure for underwater shield tunnel, the dynamic amplification effect, structural damage evolution mechanism will be studied under seismic vibration, then the damage mutation mechanism of corroded lining structure in different corrosion degree will be revealed. The study will also try to clarify the seismic dynamic response and failure mechanism of corroded single segmental lining and double-layer lining structure (which consists of corroded single segment lining and new-built secondary lining) under different corrosion state and earthquake intensity. Nevertheless, based on the seismic performance of different corrosion state, the deteriorated state partition of corrosion lining structure will be established. Then the aseismic measures and reinforcement measures can be developed according to the deteriorated state of corroded lining structure, which can guarantee the durability and long-term operation safety of underwater shield tunnel under marine environment.