Damage Mechanisms and Assessment Methods for the Masonry Affected by Blasting Vibration

摘要

The properties of ground vibrations caused by different types of engineering blasting, the damage characteristics and easily damaged positions of masonry affected by blasting vibration are analyzed first in this paper. Then according to the blasting seismic wave theories and the dynamic performances of masonry, the whole vibrating damage course and mechanisms of masonry are studied. Also three kinds of damage models i. e. impact and wave damage, vibration (shearing) damage, and accumulated vibrations damage are formed. Thus for the damaged masonry based on the different mechanisms, three main theoretic evaluating criteria i. e. variable particle velocity versus frequency, shearing stress and damage index, are developed. The conclusion provides the theoretic basis, analysis method and the key to observation for evaluating the blasting vibration effect of common structures and seismic testing.