FINITE ELEMENT ANALYSIS OF AN EARTH DAM SUBJECTED TO BLAST-INDUCED LOADING USING A HIGH STRAIN-RATE BOUNDING SURFACE MODEL

Abstract eng:
When soil or rock excavations near an earth dam are assisted with blasting, the dam may be damaged by the blast-induced loading. In order to investigate the response of an earth dam under blast-induced seismic loading, an artificial blast test on a 15 m-height earth dam is simulated. A recently proposed high strain-rate bounding surface model is adopted to model the stress-strain behavior of the dam materials. The detonation process of explosives is modeled by applying a pressure loading on the side wall of the borehole. Simulation results show that at a given elevation, the peak ground acceleration decreases with the distance to the blast hole. The peak horizontal acceleration on the upper parts of the dam is smaller than that at the dam bottom, which is different from responses to a tectonic earthquake. The maximum values of permanent and peak dynamic displacement occur near the upstream and downstream surfaces.

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