An Investigation into Source of Flyrock Which Resulted in an Accident in a Soapstone Quarry
A flytock accident took place in a soapstone quairy beyond the danger zone limit of 500 m prescribed by Regulatory Authority of India (DGMS, 1982). At the time of accident, blasting operations were taking place and all necessary safety precautions were being taken. A person sitting outside mines office at a distance of 604m from blast site was killed suddenly on being hit near the head. Death took place instantly. Doubt arose if the fatality was due to flyrock or because of some non-mining external reason. A number of persons were present as witnesses and it was concluded that no external non-mining reason was possible. Further, it was also necessary to understand the possible cause of flyrock accident as three different blasts were carried out at the same time.An investigation was carried out to find out source of flyrock in this particular situation. At the time of accident blasting operations were being carried out for removal of overburden and also for extraction of soapstone in the mine. Deep hole blasting was carried out with 115mm diameter blast holes, keeping burden 2.5 to 4.0m and spacing 2.8 to 4.0m. with depth of holes kept as 8 to 10 m. Toe holes blasting was also being carried out with 115mm diameter holes. In the toe holes blasting (shorter holes for road making or toe removal), the depth of holes varied between 2.5 to 3.0m. Simultaneously secondary blasting with jack-hammer holes (32mm) was also being carried out. A scientific study was carried out to find out the source of flyrock from three different types of blasting to take preventive safety measures in future.In this work an analysis of flyrock was carried out. A typical quarry blast situation was modelled and estimates of distance to which flyrock could be propelled were determined. It was concluded that flyrock could have ejected from toe hole blasting and could have traveled to distance of more than 700m. A series of test blasts were also conducted and video graphed to determine the source of flyrock.
flyrock soapstone quarry accident
SUSHIL BHANDARI S.S. RATHORE S.C. JAIN
Mining Engineering, JNV University, Earth Resource Technology Consultants, Jodhpur, India Department of Mining Engineering Department of Mining Engineering, M. P. University of Agriculture and Technology, Udaipur, India
国际会议
The Asian-Pacific Symposium on Blasting Techniques(亚洲太平洋地区爆破技术研讨会)
昆明
英文
567-573
2007-05-08（万方平台首次上网日期，不代表论文的发表时间）