The Effect of Geological Structure and Powder Factor in Flyrock Accident, Masai, Johor, Malaysia

 

Edy Tonnizam Mohamad

Associate Professor (Dr.), Universiti Teknologi Malaysia, Department of Geotechnics and Transportation,Faculty of Civil Engineering, 81310 UTM Skudai, Johor, Malaysia
e-mail: edy@utm.com

Danial Jahed Armaghani

PhD Student, Universiti Teknologi Malaysia, Department of Geotechnics and Transportation,Faculty of Civil Engineering, 81310 UTM Skudai, Johor, Malaysia
e-mail: danialarmaghani@yahoo.com

Hossein Motaghedi

PhD in Geotechnical Engineering, Faculty of Civil Engineering, Islamic Azad University of Qaem Shahr, Qaem Shahr, Iran
e-mail: hossein.motaghedi@yahoo.com

 

 ABSTRACT

Rock blasting is the most commonly used method for rock breakage in the ?eld 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.

Keywords: Rock blasting, Flyrock accident, Blast geometry, Geological Structure, Powder factor.

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