Earthquake damage types and the numerical analysis of influencing factors about destructiveness of underground caverns
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Abstract:
Based on earthquake damage data collection around the world, the earthquake damage types of underground cavern were comprehensively analyzed, such as the structural failure caused by slope failure, the portal collapse, the fault movement of cavern crosscut, the large displacement between two intersected faults, the spalling of surrounding rock, the disturbance or deformation of the support and lining system and so on. Numerical simulation technology was applied to analyze the influencing factors of underground caverns destructiveness. The calculation results showed that: the cavern was easier to be destroyed under higher earthquake intensity; dynamic stability of circular tunnel was better; the cavern constructed on homogeneous and hard rock was nontrivial to been damaged by earthquake; the dynamic displacement response index would be smaller with a large ground stress in the underground cavern region; the increase of lining stiffness would partly rise the degree of the seismic damage ; the outlet of cavern suffered the earthquake destruction easily.
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