In recent years, empirical methods for predicting fragmentation that will be obtained from a given structural geology, rock type, explosive and blast pattern have become better and more useful. In addition, computer-assisted photographic techniques for measuring the size distribution of blasts have been developed.
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Calyceal diverticuli also present a challenge for stones clearance after fragmentation and are often better served with PCNL or URS to render the patient stone free . The presence of hydronephrosis has also been associated with worse outcomes, . The potential deleterious effect of hydronephrosis with stone passage is thought to be …
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To study the distribution law of blasting fragmentation in the process of directional blasting demolition of concrete structure, a new method of the joint measurement method of mini-blasting I-type vibration meter and piezoelectric smart sensors was used to monitor the blasting load failure test of 30 specimens. Considering the influence of low …
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Stress-wave Induced Fracture in Rock due to Explosive Action. Blasting is a complex phenomenon and many parameters affect the outcome of a blast. The process of rock fragmentation by blasting is not well understood yet. …
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Blasting for breaking hard rock is a well-known economical way for civil engineering and mining projects for more than 70 years. Desired good fragmentation is the most important result of any blasting operation which has a direct impact on efficiency and productivity of downstream operation such as loading, transport, crushing, and milling []. ...
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Rock fragmentation by blasting influences ore recovery and the cost of downstream operations. The development of electronic detonators makes it possible to improve fragmentation by controlling the ...
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Sieve analysis [10] and image analysis [11,12] of rock fragmentation have been used in mines and quarries to control the quality of blasting and measure blast …
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Blasting methods to improve rock fragmentation 1123 uniformity of rock fragmentation, so that the yield of fractions up to 400 mm in size increases from 40 to 70%, the yield of lumps decreases by a factor of 2-4 and the specific requirements for …
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1. Introduction. Drilling and blasting, as an indispensable method for rock breakage, is extensively employed across diverse engineering domains such as tunnel construction, shaft excavation, and mining operations [1], [2], [3].It is well known that decoupled charge modes are commonly implemented in the mining industry, and the rock …
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In this paper, burnt rock is taken as the research object. Based on the field investigation and data collection of open-pit mines with fire areas, the blasting and crushing mechanism of burnt rock ...
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Review of Fragmentation Prediction Models. Blasting is widely used for rock breakage in underground as well as opencast mines. The size distribution of the resulting rock fragmentation has always ...
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A brief history of the development of blasting and the modern theory of rock breaking. July 2016. Journal of Degraded and Mining Lands Management 3 (4):617-623. DOI: 10.15243/jdmlm.2016.034.617 ...
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The results highlight the importance of optimizing blasting parameters and charge structure for large-scale mining operations to achieve uniform rock fragmentation and low fines content.
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The analysis of blast-induced fragmentation is gaining importance in assessing and improving mining efficiency. By understanding the distribution and size of fragmented material after blasting, companies can adjust blast parameters to achieve the desired fragmentation, leading to enhanced downstream processing, reduced energy …
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Quarry blasting techniques – Royex System Normally, close space blasting patterns is used to obtain good fragmentation but this also implies over ... Techniques of Controlled Blasting SlideShare Dec 17, 2009 · techniques of controlled blasting to improve overall environmental & safety standard ... quarry blasting.
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TLDR. A 2-D light detection and ranging (LiDAR) sensor along with machine learning (ML) techniques was used to estimate the characteristics of iron ore particles on conveyor belts, demonstrating that the system has the potential for improving mineral processing controls and heightening operational safety within the mining sector. Expand.
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The aim of the study is the development of an environmentally friendly, low-emission production of dimension stone and gravel in six different quarries by optimizing …
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In any blast design, the burden and the blast hole depth (or bench height) must be reasonably compatible. The rule of thumb for bench blasting is that the hole depth-to-burden ratio should be between 1.5 and 4.0. Hole depths. Figure 19-13.—Staggered blast pattern with alternate delays (blast hole spacing, S, is.
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WebBlasting for breaking hard rock is a well-known economical way for civil engineering and mining projects for more than 70 years. Desired good fragmentation is …
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Rock fragmentation control in opencast blasting ScienceDirect. 201641The main important parameters which decide the fragmentation level of particular blasts are burden to hole diameter ratio, spacing to burden ratio, stemming column length, stiffness ratio, explosives amount and type, initiation mode and charge/powder factor.
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Investigating rock fragmentation in distributed spherical air-gap blasting technique. This directly affects the mine economy and increases the amount of fines, …
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The influence of air-deck blasting on fragmentation in jointed rock masses of a manganese open-pit mine has been investigated. It is revealed that air-deck blasting improves the degree of ...
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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 ...
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Long-period (½-second) delays are primarily used in underground blasting applications. For surface blasting, detonators with relatively short-period timing intervals from 25-50 milliseconds (short period) produce the best blasting results. These types of blasts generally produce better rock fragmentation.
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In addition, better fragmentation was obtained by using the plaster stemming method. Blast trials showed that plaster stemming produced finer material than the conventional methods ...
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Quarry mining is a term preferably restrict to production of dimension stone only. The products of dimension stone quarries are prismatic blocks of rocks such as …
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Blast fragmentation is influenced by numbers of blast design parameters. It is difficult to propose a fitting equation considering all the influential factors simultaneously. In such complex circumstances, artificial intelligence (AI)-based methods, which can develop a complicated relationship among various input and output variables, attract ...
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In conventional blasting when explosive is detonated, it releases huge amount of effective and non-effective energies that can produce gas and shock accompanied by light, heat, sound and pressure. The effective energy can act as a useful tool in breaking rock for mining and construction purposes. However, the non-effective energy can cause …
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The conventional blasting rock excavation method is the main means of rock breakage because of its high productivity, and it is relatively inexpensive compared to other …
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The Kuznetsov equation relates the mean fragment size to the quantity of explosives needed to blast for a given volume of rock. The Kuznetsov equation is (2) k 50 = A ( V Q) 0.8 Q 1 / 6 where k50 is the average fragment in cm, A is a rock factor, V is the rock volume in m 3 broken per hole (burden × spacing × bench height), and Q is the mass ...
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