Partitions of seismic affected zone and characteristics of segmental lining based on energy principle

Abstract

The whole process of tunnel structure from deformation to instability under earthquake motion is closely related to the input, transformation and dissipation of seismic energy. Based on the energy response of tunnel structure, this paper establishes an energy balanced equation under the seismic wave excitation. According to the relationship between input energy and inherent energy of structure, the instability criterion is proposed based on failure of overall structure. Firstly, the energy response characteristics of tunnels across different fault widths are analyzed under seismic excitation, and the relationship between energy-based structural instability and deformation is verified through combining the energy stability functions and structural deformation. Secondly, on the basis of releasable elastic strain energy, the longitudinal affected sections of cross-fault tunnel are divided under strong ground motion. Thus, the self-adaptability deformation characteristic of tunnel structure is studied inside the fault fracture zones during earthquake motion, and then the segmental lining is designed to adapt deformation of surrounding rock at the main influenced areas of fault belt. Lastly, the dynamic stability functions are compared and analyzed at different positions of the fault, and the optimal anti-seismic measure is proposed to improve aseismic performance of tunnel structure based on energy criterion.

Keywords

tunnel engineering / energy criterion / affected zone / segmental lining / cross-fault tunnel / strong earthquake

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