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Application of digital image analysis for monitoring the behavior of factors that control the rock fragmentation in opencast bench blasting: a case study conducted over four opencast coal mines of the Talcher Coalfields, India

Singh Binay Kumar, Mondal Debjeet, Shahid Mohd, Saxena Amit, Roy Paresh Nath Singha

Journal of Sustainable Mining

2019

Vol. 18, iss. 4

247--256

Drilling and blasting play a very important role in driving the economy of opencast mines, as various mining activities related to strata handling are dependent on the size of the rock mass created due to blasting. Thus the analysis of fragments created from rock explosion is essential in order to monitor its compatibility with the deployed mining machineries/HEMMs (such as shovel, dumper, dragline, etc.). As over fragmentation as well as under fragmentation both tend to increase the cost of mining, the generation of fragment size in the desired range is necessary. Several factors control the rock fragmentation in blasting, such as the burden, bench height/drilling depth, stemming column, powder factor and hole diameter. The assessment of rock fragmentation with respect to the aforementioned parameters helps to enhance the blast performance and, hence, this study intends to carry out digital image analysis for monitoring the mean fragment size and boulder percentage. A highly consistent result has been obtained using forty blasting datasets carried out in the four different opencast mines of the Talcher Coalfield (India), namely Balram OCP, Ananta OCP, Lakhanpur OCP, and Lajkura OCP.

Investigation of the effect of ground vibration on buildings due to blasting

Karakus D., Pamukcu C., Onur A. H., Konak G., Safak S.

Archives of Mining Sciences

2010

Vol. 55, no 1

123-140

The ground vibrations caused by bench blasting at open pit mines have been explored since the 1930's and several approaches have been made regarding the damage criteria. In all these studies, the amount of explosives and distance to the blasting points are taken as basis as the main variable of ground vibration while other variables are evaluated within the coefficients of the developed formulae. This study majorly focuses on how ground vibrations propagate through buildings. For this purpose, two prototype buildings were constructed in the laboratory and in the field and they were exposed to blasting vibrations. The levels of vibration on several floors of the building were determined and a mathematical model was proposed for the estimation of these vibrations.

Badania gruntu spowodowane pracami strzałowymi w górnictwie odkrywkowym zapoczątkowano już w latach 30-stych 20 wieku, w wyniku których opracowano różne podejścia metody i metody ustalania kryteriów uszkodzeń. We wszystkich badaniach uwzględniano podstawowe parametry, takie jak ilość zastosowanego materiału wybuchowego i odległość od miejsca prowadzenia prac strzałowych w celu ustalenia głównej zmiennej czyli wielkości drgań gruntu. Pozostałe zmienne obliczano na podstawie wyprowadzanych wzorów i przy pomocy odpowiednich współczynników. W niniejszym artykule zbadano w jaki sposób drgania terenu propagują w budynkach. W tym celu w warunkach laboratoryjnych zbudowano dwa prototypy budynków, które następnie poddano działaniom wstrząsów wskutek robót strzałowych w terenie. Określono poziom drgań na poszczególnych piętrach budynku, opracowano model matematyczny do estymacji poziomu drgań.