Abstract
Solid-water interaction problems during earthquakes can usually be divided into three categories: contact, cavitation and separation. This division is made according to the earthquake intensity subjected to by the solid and water masses. In this paper, the mechanism of the solid-water separation problem and its effect on the motion of the solid and water masses are studied using a simplified two masses model. The analytical results here indicate that (1) compared to the solid-water cavitation effect, solid-water separation enlarges the separation time interval between the solid and water masses during strong ground motion; (2) solid-water separation may change the frequency of the system, and consequently the resonance of the system can be suppressed to some extent; (3) solid-water separation can reduce the dynamic water pressure on the solid mass as well as prevent any adverse effect due to cavitation.
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