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 by explosives used in 3.5 km length tunnel excavated by drilling-blasting methods through volcanic formation (Andesite, Dacite, Rhyolite, Tuff and Conglomerate) located in Ankara Subway, Ulus- Kecioren, metro line were investigated. The overburden thickness of the excavated tunnel in volcanic series varies from 8 m to 35 m. As the subway line passes under the urban areas, the applied explosive pattern is determined after several blasting trial-errors and the obtained blasting results was evaluated according to USBM RI 8507 (1980) standard. In this study, the water table, geological formations and sequence, geological disturbances and overburden thickness. All these factors are evaluated one by one and the effects of these factors on the particle velocity are traced and analyzed from the source up to the surface. As a conclusion, how the blasting induced ground vibration particle velocity, affected by: 1) propagation in one geologic formation, 2) propagation in two or three geologic formations, 3) propagation when the tunnel face is under or over the water table, 4) propagation through the disturbance zones, was analyzed according to obtained numerous measurement results.