Rock blasting is the most commonly used method for rock breakage in the field of civil and mining. The main goal of such operation is to produce the desired fragment size distribution leading to optimize the overall mine/plant economics. Blasting has some environmental impact such as ground vibration, airblast, dust and fumes and flyrock. One of the undesirable phenomena in the blasting operation is flyrock, which is a propelled rock fragment by explosive energy beyond the blast area. A flyrock accident occurred during a blasting work at Masai quarry Johor, Malaysia in 19 July 2013. Due to this accident, a factory worker was killed while 10 others were injured after being hit by rock debris from an explosion at a quarry that flew up to 700 m away. The main purpose of this study is to investigate the causes of flyrock accident based on results of geological structure and also powder factor. In order to investigate causes of this accident, two continues blasting patterns were considered and powder factor of these blasts were calculated. It is concluded that blast geometry (such as burden and spacing), total weight of explosive, close distance between the quarry and the residential area, and geological conditions were considered the most influentioal parameters in this accident.
کلید واژگان :Rock blasting, Flyrock accident, Blast geometry, Geological Structure, Powder factor.
ارزش ریالی : 600000 ریال
با پرداخت الکترونیک