The study of seismic response and crack dynamic extension rule of the concrete dam under the fluid-solid coupling action

Abstract

Combining with the concrete elastic damage theory, make a dynamic simulation analysis on the seismic response and crack dynamic extension rule of the concrete dam under the fluid-solid coupling action with the extended finite element technology, the conclusions are as follows: under the seismic action, tension failure and shear failure appear at the same time, shear failure happens to the side near the reservoir, stress concentration phenomenon appears at the inflection point of the dam, which lead to the tension failure and producing crack band, and the crack run through the dam to the failure of the dam; the dam crack appears when the seismic waves reach the peak value, and the change rule of displacement, velocity and stress distribution is similar to the seismic wave acceleration change curve; the failure of dam is induced by the both action of seismic and reservoir.

Keywords: damage failure; crack dynamic extension; seismic response; extended finite element; crack degree.