The Effect of Geotechnical Factors on Blasting Induced Ground Vibration Particle Velocity

摘要

In this article, the effect of geotechnical factors on ground vibration particle velocity induced byrnexplosives used in 3.5 km length tunnel excavated by drilling-blasting methods through volcanicrnformation (Andesite, Dacite, Rhyolite, Tuff and Conglomerate) located in Ankara Subway, Ulus-rnKecioren, metro line were investigated.rnThe overburden thickness of the excavated tunnel in volcanic series varies from 8 m to 35 m.rnAs the subway line passes under the urban areas, the applied explosive pattern is determined afterrnseveral blasting trial-errors and the obtained blasting results was evaluated according to USBM RIrn8507 (1980) standard.rnIn this study, the water table, geological formations and sequence, geological disturbances andrnoverburden thickness. All these factors are evaluated one by one and the effects of these factors on thernparticle velocity are traced and analyzed from the source up to the surface.rnAs a conclusion, how the blasting induced ground vibration particle velocity, affected by: 1)rnpropagation in one geologic formation, 2) propagation in two or three geologic formations, 3)rnpropagation when the tunnel face is under or over the water table, 4) propagation through therndisturbance zones, was analyzed according to obtained numerous measurement results.