Control negative effects of blasting waves on concrete of the structures by analyzing of parameters of ground vibration

摘要

In the most of civil projects, many activities are done in the vicinity of each other. Synchronic of concreting and blasting causes cracks and reduction of final resistance of concrete because of dynamic waves induced by blasting. This qualification is more negative for long term using structures and those which is relevant with under pressure water. This paper introduces dynamic waves and their influence on the underground structures; controlling methods of dynamic waves induced by blasting in the base of peak particle velocity and finally design of surge tank storage shafts excavation in Gotvand dam neighbor of concrete structures in these storages. The dynamic site factors that are calculated from seismographic tests in Bakhtiary conglomerate shows that constant dynamic factors K & β are 40.859 and 1.8717, respectively. Furthermore with combination of Nonel and electric detonator we achieved the reduction of negative effects caused by blasting of each construction as well as a significant reduction in excavation costs in each stage.