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Varistem says its system "reduces processing costs, with the Varistem achieving up to a 25% increase in fragmentation. Studies also show the Varistem can reduce blast patterns by 10% or greater and achieve the same fragmentation for major savings in drilling and explosive costs." (See IM March 2011).
Fragmentation due to blasting is influenced by the rock mass properties [].Properties like rock mass strength, joint conditions and pattern affects the propagation of shock wave generated by blasting [2, 3].Joint planes restrict the shock wave travel, therefore, the orientation of joint planes, angle made by joint plane with blast hole dictate …
Table 1 Blast and fragmentation data: blast sites, rock types and references Blast site Rock References El Alto quarry, Spain Limestone Segarra and Sanchidria «n(2003 ), Sanchidria«n et al. (2006 )
The shape characteristics of blasting fragments are important for analyzing the blasting fragmentation mechanism and evaluating the fragmentation energy efficiency. In this study, through field blasting experiments and morphological parameter measurements, fractal theory was employed to reveal the fractal characteristics of rock …
the usual civil application of rock blasting remains largely undefined. Although the measurement of some of the effects of the explosive in rock is customary (vibration, fragmentation and, to a minor extent, rock movement), they are usually conducted for blast control purpose and the results are rarely cast in terms of their energy content.
This paper describes the result of a systematic study on the impact of blast design parameters on rock fragmentation at three mines in India. ... a blasting work at Masai quarry Johor, Malaysia in ...
By using electrical explosion of metal wires, this study proposed a new experimental method to investigate the dynamic fracture process and fragmentation characteristics of rock-like materials under column charge blasting. A copper wire with a length of 100 mm was prefabricated in a mortar sample measuring 300 mm × 300 mm × …
The size distribution of a muck pile depends not on only the blasting standard but also on the mechanical properties, joint system, and crack density of the rock mass. As, the cracks in the rock masses are especially heavily developed at the limestone quarries in Japan, they, along with the joints, have a large impact on the effects of blasting, such as …
Aggregate consumption will be exceeding 350 MTPA by 2019. Aggregate quarry under study has proposed increased production from 2.5 MTPA to 5 MTPA. Drilling and blasting accounts for 28% of total ...
A continuous blast fragmentation analysis plays a vital role in the evolution of efficiency and productivity of quarry blast. If blast fragmentation is not of required size, it can increase production cost and delay in quarry progress due to unnecessary secondary blasting which is a safety concern in blasting or require use of rock breakers to reduce …
Drilling and blasting remains the primary method of rock fragmentation in metal mining. However, blasting vibration can adversely affect the stability of the rock.
Analysis of bench face movement in quarry blasting. Chapter. ... This paper evaluates the actual energy delivered by the explosives used in the fragmentation of rock during blasting vs. the ...
Mines, quarries and construction sites face environmental impacts, such as flyrock, due to blasting operations. Flyrock may cause damage to structures and injury to human. Therefore, flyrock prediction is required to determine safe blasting zone. In this regard, 232 blasting operations were investigated in five granite quarries, Malaysia. …
The blasting effects are highly dependent on the maximum instantaneous charge in blast holes (Q) which are dependent on parameters like number of blast holes, charge per column, Powder Factor and number of blast per delay. This study was able to show that with an increase of the independent variables, the Q value rises significantly.
This paper aims to study the effect of geological condition on fragmentation produced by blasting in a marble quarry in Simpang Pulai, Perak, Malaysia; as the condition of the in-situ...
This study investigates the influence of blast design parameters on rock fragmentation. Six different blast designs were studied and analyzed. Rock samples were obtained from each face ... million tonnes of limestone annually for the construction industry in Malaysia. The quarry is geologically within Kinta Valley which has been dated Devonian ...
fragmentation is very crucial in designing a blasting programme. The size of fragment is an important factor to evaluate the efficiency and productivity of blasting [1], [2]. If rock fragmentation is not accessed regularly, production cost and time delay in quarrying process can increase beyond expectation.
This study tries to predict blast-induced flyrock using intelligent modelling techniques. Flyrock is a site-specific phenomenon. Design variables and rock properties highly influence flyrock throw distance. Site investigations were conducted in a sandstone quarry. Fundamental operational parameters, blast dimensions, bench face condition, …
Blast-induced ground vibration is one of the most significant challenges in explosive rock fragmentation, affecting mine stability and worker and machine safety. However, limited research has suggested a correlation between slope stability and blast-induced ground vibration. Thus, improving mining sustainability requires assessing mine …
Blasting is heavily regulated and watched by federal, state and local agencies. In terms of processing, blasting is the critical first step in the rock-fragmentation process. Maximum profitability depends largely on an optimized blast. Consider that drilling and blasting are the first operations performed in any hard rock quarry operation.
184 Investigation of Some Blast Design and Evaluation Parameters for Fragmentation in Limestone Quarries Fig. 1. Occurrence of large over sizes within a blasted limestone muck pile (square scales ...
dissertation entitled "Effect of Blast Designs on Rock Fragmentation at Lafarge Kanthan Quarry, Chemor, Perak". I also declare that it has not been previously sent for the award of any degree or diploma and other similar title for any …
The fragmented material produced by blasting has a great influence on mining and construction in different aspects. [3] Cited from [4] that in mining and processing plants, rock fragmentation ...
The rock fragmentation does not obviously consume all the energy produced by the explosive during the blasting as larger percentage of the energy is converted to the ground vibration, airblast and ...
Blasting efficiency in granite aggregate quarry based on the combined effects of fragmentation and weighted environmental hazards Shaib Abdulazeez Shehu1, 2*, Kudirat Oziohu Yusuf3, Hareyani Zabidi1, Onimisi A. Jimoh1, 1M.H.M. Hashim 1 Universiti Sains Malaysia, Penang, Malaysia 2 Confluence University of Science and Technology, Osara, …
In blasting operations, a huge amount of energy is normally wasted to generate some unwanted issues in the surrounding zones, e.g., flyrock and oversize boulders. In this study, to solve these environmental issues of blasting, two phases of prediction and optimization were considered and applied. In the phase of prediction, the …
Evaluation of fragmentation is an indispensable step in the optimisation of blasting. The various techniques for analysing blast fragmentation have their inherent issues causing various degrees of
Safe and efficient blasting is the prime objective of any blasting engineer. The safe and efficient is generally called when there are no fly rocks, less ground vibration and optimum fragmentation with loose muckpile. This study describes the use of stemming material and inter-row delay timing effect to improve the efficiency of the blast and its …
Purpose. Mine and quarry operators determine blasting efficiency by the sizes of fragments, while regulatory agencies evaluate the same from the level of environmental discomfort. Thus, a conflict of interest exists. This research distinguishes fragmentation efficiency from blasting efficiency. It proposes a new approach for …
Rustan, 1998, Chakraborty et al., 2004 have summarized the capabilities of various image analysis software developed world-wide for blast fragmentation assessment. Kuznetsov (1973) has suggested the following empirical equation to predict the mean fragmentation size resulting from rock blasting: (1) X 50 = A V / Q 0.8 Q 0.167. In Eq.
This research was aimed at developing a new model to predict flyrock distance based on a genetic programming (GP) technique. For this purpose, six granite quarry mines in the Johor area of Malaysia were investigated, for which various controllable blasting parameters were recorded. A total of 262 datasets consisting of six variables (i.e., powder …
This paper aims to study the effect of geological condition on fragmentation produced by blasting in a marble quarry in Simpang Pulai, Perak, Malaysia; as the condition of the in-situ rock mass is ...
Hereby in-hole losses, seismic energy, kinetic energy of throw and fragmentation energy have been calculated. For the AN doped gassed bulk emulsion used in the quarry, it is estimated that 60-70% ...
Blast-induced ground vibration has a direct relationship to powder factor, the distance between blast point to struc-tures, geometry of the blast, and rock mas structural prop-erties (Joo et al. 1997;KhandelwalandSingh2007;Elevli and Arpaz 2010;Nateghi2012). The distance to nearby structures and rock properties are not controllable, but the
Blast event 4 has the highest fragmentation efficiency of 46.53%, while 3 has the highest environmental control efficiency of 69.47%. Cumulatively, blast event 4 has the highest overall blasting ...
Table 1 Blast and fragmentation data: blast sites, rock types and references Blast site Rock References El Alto quarry, Spain Limestone Segarra and Sanchidria´n(2003), Sanchidria´n et al. (2006)
