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Performance-based three-level fortification goal and its application in anti-dislocation countermeasures:A case study of Shantou Submarine tunnel

引用

Underground Space 2023年第5期12卷 251-270页

作者： Tianqiang Wang Ping Geng Guoguo Liu Changjian Chen Wenqi Gu Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSchool of Civil EngineeringSouthwest Jiaotong UniversityChengdu 610031China

The dislocation momentum is the design basis for anti-dislocation to tunnel when a tunnel crosses an active *** influence of different dislocation levels on tunnel performances is not ***,based on seismic activity parameters at the site of interest and probability of fault dislocation,probability fault displacement hazard analysis(PFDHA)methodology was introduced in this paper to ascertain the fault dislocation level under different exceeding probabilities(63%,10%,and 2%–3%).Then,based on the definition of different ground motion strength and fortification goals of the tunnel,a three-level fortification goal with different performance requirements of the tunnel was *** first attempt to use the proposed indexes including the maximum dislocation of the tunnel and maximum relative deformation of the tunnel was tried to evaluate deformation and failure states with an experimental ***,the feasibility of the three-level fortification goal was further investigated according to the self-defined qualitative description and quantitative indexes in the segmental design and sectional expansion tunnels *** results show that the fault dislocations relying on PFDHA at the site of the Shantou Submarine Tunnel are firstly ascertained as 0.04,1.8,and 2.4 m *** the fault dislocation as model input values into account,the dislocation mechanism of the tunnel under the three levels was *** importantly,judging from the dislocation performance requirements of the three-level fortification goal,the tunnel deformation and failure states are mitigated by adopting the *** sectional expansion design can well meet the requirements without the restriction of a strong earthquake,while the effectiveness of the segmental tunnel can be proved under frequently occurred and fortification *** final research results are expected to provide a new fortification goal for anti-dislocation hazard evalu

关键词： Fault-crossing tunnel PFDHA methodology Three-level fortification goal Failure modes anti-dislocation countermeasures

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