Abstract:

The aim of this paper is to examine the influences of waves caused by blasting on the mechanical behavior of tunnel support structures. Circular cylinder structure, made from concrete, reinforcement concrete and cast-iron, was taken into consideration. Length of each cylinder is of (1.53.0) m, and its thickness is designed of (0.30.4) m. The cylinder struture was assumed to be placed in elastic and elastoplastic medium. Both mathematical analysis method and ricardian equivalence theory were utilized to conduct this research. The study show that the interaction between tunnel support structures and blast waves is cyclic, the stress distribution under blasting effect depends on specific oscillation frequency, T0, form of external load function H(t) induced by blast wave acting on surface of support structures. The finding of this research contribute to the estimation on stress distribution and displacement of support structure deveploped in circular cylinder structures, susequently load carrying capacity of tunnel supports induced by blast vibration