— This paper presents a simple method to evaluate the two-dimensional fragmentation zone induced by gas pressure during blasting in rock. The fragmentation zone is characterized by analyzing crack propagation from the blasthole. To do this, a model of the blasthole with a number of radial cracks of equal length in an infinite elastic …

of explosive energy be placed into proper perspective within the entire drilling, blasting, handling and process-ing operation. This relationship is illustrated in Figure 8-7. (Figure 8-7) Analysis of efficient blast design.. Efficient blast designs combined with the proper choice of explosive can produce better fragmentation with

 — 1 Introduction. Deep-hole bench blasting is currently the primary method for aggregate extraction in mines. However, during the process of aggregate extraction, issues such as uneven rock fragmentation and high fines content often arise due to the complex geological conditions and suboptimal blasting process parameters (Roy et al., 2016).The …

 — This project conducted in order to analyses the optimization of drilling and blasting parameters to influence achievement of good fragmentation at Songwe II Limestone quarry. The main objective of this …

 — Delay blasting techniques can also be used to manage adverse geologic conditions and control of vibration and air blast effects. Major advantages of millisecond (MS) blasting are: Reduction of ground vibration and air blast; Improved fragmentation; Reduction of overbreak and flyrock; Improved productivity and lower costs

 — A laboratory and theoretical study of air decks was carried out to assess the effects of the size and location of air-decks on fragmentation. The degree of fragmentation was found to depend on both factors. As the size of the air-deck increases the degree of fragmentation is reduced relative to a full column charge. However, the reduction is …

 — This paper evaluates the fragmentation of in-situ rock blasting, and further introduces a unique approach to evaluate rock fragmentation on the ROM pad and the …

 — In addition, better fragmentation was obtained by using the plaster stemming method. Blast trials showed that plaster stemming produced finer material. ... Inappropriate blasting techniques can ...

 — The blasting operation considerably influences the overall productivity of opencast mines, especially when blasting results in oversized fragments that impact the operations ranging from excavation to milling. …

 — The magnification ratio and fragment sizes show that Block A has better fragmentation than Block B. Ammonia gas was not present in the area of study before blasting but the fume emitted after ...

Semantic Scholar extracted view of "A Field Study Of Fracture Control Techniques For Smooth Wall Blasting" by D. Holloway et al. ... A series of detailed small-scale tests have been made to investigate the use of short delays to promote better fragmentation caused by shock wave interactions. ... Abstract The ornamental stone industry is ...

 — Article Highlights. ML models, including RFR, SVR, XGBoost, and ANN, are used to optimize fragmentation prediction. This study utilizes permutation importance …

 — Blasting is accompanied by a number of side effects that have a negative impact on the environment, such as ground vibration, flyrock, AOp, and backbreaks [33, 42].These effects are more severe if they are carried out in close proximity to residential buildings, factories, offices or if they are improperly designed [].Proper designing of a …

 — blast performance assessment in terms of fragmentation analysis have always been done in the pit or stope and not on the ROM pad. This paper presents an innovative way of assessing rock fragmentation from in-pit blasting to the mill. The importance of blast optimization to the mine-to-mill concept of the extractive industry has …

 — The experimental results showed that: (1) the blasts with full sand stemming yielded better (finer) fragmentation than the blasts with partial steel stemming at a constant specific charge, and (2 ...

 — The new heaving blasting techniques give a considerable increase in the amount of useful energy and significantly reduce the requirements for explosives. The experimental investigations of the three principal stages of the heaving process during an air-cavity charge explosion have shown (Melnikov et a/., 1976) that the transmission of …

 — 2.1 Role of Blast Design in Sustainable Mining and Mineral Processing. Utilizing blasting for rock fragmentation offers distinct cost advantages over employing crushing and grinding methods, which is the reason most mine-to-mill strategies focus on optimizing blast design to produce a desired particle size distribution (Shields and Silva …

 — 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 …

 — 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 ...

 — Deep-hole bench blasting is the primary method for aggregate extraction in mines. However, factors such as complex geological conditions and suboptimal blasting parameters often result in …

Drilling and blasting are fundamental operations in the mining cycle and constitute an important component of the mining costs. Rock fragmentation can in principle be managed by means of two options: by increasing or …

 — The borehole effect provided the proper placement and movement of the muckpile and allows for better fragmentation of the rock mass. As the stiffness ratio is reduced (closer to 1), the cratering action will become more prevalent. ... The stemming ratio should be about 0.7 when using crushed stone; when using other materials, the …

 — 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 …

 — The development of new blasting techniques, such as pre-splitting, cushion blasting, and water-based blasting, has aimed to reduce the environmental and social impacts while maintaining the blasting efficiency and safety. ... [11] have been claimed to be better representations of blast fragmentation. However, the constraints in such prediction ...

 — Airdecking once considered a fringe concept is proving that conventional practices can be re-imagined. With a broad range of applications, it can be applied to airdecking and other new techniques – coupled with advances in material and better design of plugs – are raising the ceiling in what can be achieved in blasting.

 — Fragmentation optimization is achieved by considering the energy efficiency of the explosive, the optimal distribution of explosive energy in the rocky mass, and the programmed and controlled release …

 — Fragmentation, the most common method for assessing blast efficiency, provides significant benefits to post-blast operations. The most important parameter affecting fragmentation in blasting is geological formation characteristics. This study aimed to investigate the blasting efficiency on different geological units in the blasting area …

 — Under well-controlled conditions, Ouchterlony et al. [] assessed energy partitioning of limestone production blasts and computed in-hole losses, seismic energy, the kinetic energy of throw, and fragmentation energy.Their search revealed the energy partitioning of a blast with bulk emulsion explosive would be []Crushing and other losses …

Ask the Chatbot a Question Ask the Chatbot a Question blasting, process of reducing a solid body, such as rock, to fragments by using an explosive.Conventional blasting operations include (1) drilling holes, (2) placing a charge and detonator in each hole, (3) detonating the charge, and (4) clearing away the broken material.. Upon detonation, the …

 — 1. Burden ratio (KB). This is the ratio of burden (in feet) to the diameter of the explosive (in inches) due to the fact that typically the burden will be scaled based on the diameter of the explosive. 2. Hole …