Air-decked blasting techniques: some collaborative …
— 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 …
Optimized Burden-Spacing for Improvement of Rock …
— Different empirical models and techniques are available for predicting and investigating the consequences of blasting, one of which is the Kuznetsov-Cunningham …
Blasting methods to improve rock fragmentation
— 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 …
ANALYSIS OF DRILLING AND BLASTING …
— 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 …
Rock Fragmentation Evaluation towards Blast-To-Mill …
— 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 …
Prediction of Fragmentation Zone Induced by Blasting in …
— 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 …
Drilling and Blasting
Drilling and blasting is widely used in mining and construction industries, and ground vibration is one of the detrimental effects caused by blasting. To determine the fragmentation of rocks and to ensure the safety of ambient urban areas and residents, it is necessary to determine the parameters that have a reasonable influence on blast ...
SUBDRILL THE UNDERUTILISED BLASTING PARAMETER
ISEE, 46th Annual Conference on Explosives and Blasting Technique, Denver, CO. STAB HOLE TECHNIQUE. Subdrill - The Underutilised Blasting Parameter | January 2020 • ADVANTAGES • Better fragmentation of the top of the bench. • DISADVANTAGES • An extra drilling stage is required for the stab holes. • Stab holes need to be manually ...
Rock fragmentation size distribution control in …
— 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 …
Optimization of an Artificial Neural Network Using Four …
— Rock fragmentation is a critical process in mining operations, with blasting being one of the most common and effective methods employed to achieve the desired results. The primary goal of blasting operations is to deliver optimum rock fragmentation while avoiding adverse environmental effects like back-breaks, fly rock, and ground …
Experimental study of rock fragmentation under different stemming
— 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 ...
Plasma blasting of rocks and rocks-like materials: An …
— Plasma blasting technology (PBT) is a potential alternative to chemical blasting and mechanical cutting methods for fragmentation of natural rocks, concrete, geopolymers, and other rocks-like materials.We present an analytical model of PBT addressing currently inadequate understanding of the dynamics of shock waves …
Emerging trends in drilling and blasting technology: concerns …
— 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 …
Blasting mechanics revisited: Blasting design …
— 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 …
Experimental research and theoretical analysis on blasting
— 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 …
Advanced Analytics for Drilling and Blasting | SpringerLink
— 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 …
Chapter 8 BLAST DESIGN
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
Numerical investigation of blast-induced rock fragmentation
— Optimum fragmentation of rocks during blasting is pivotal for the productivity of mining and civil engineering systems. Extensive studies on the ubiquitous fragmentation phenomena in nature and artificial processes have attested to the dominant control of the effective dimensionality and material brittleness on the size distribution of fragments.
(PDF) Rock Fragmentation by Blasting – a review
— 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 ...
(PDF) Controlled blasting in a limestone mine …
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 …
Determination of the Effective Blasting Region by Using Fragmentation …
— 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 …
Airdecking and the use of modified blasting techniques
— 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.
Blasting Techniques Used in Underground and Opencast Mines | Mining
Read this article to learn about the blasting techniques adopted in underground and opencast mines. Blasting Techniques Adopted in Underground Mines: Drilling Patterns in Stone: Drilling patterns, also called shot-hole patterns, are named after the type of cut holes used and the principal patterns are: (1) Pyramid cut or cone cut (2) Wedge cut (3) Drage …
Study on blasting fragmentation mechanism of burnt rock …
— A large number of burnt rocks in some open-pit mines in Xinjiang, Inner Mongolia and Ningxia have a great influence on the blasting effect. For this kind of rock, through the analysis of physical ...
Numerical Modelling of Blasting Fragmentation …
— 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. …
Prediction of Rock Fragmentation for Surface Mine Blasting …
— Blasting is essential in mining for rock fragmentation, significantly impacting downstream processes, overall productivity, and the efficiency of resource extraction. This study uses machine learning models, including decision tree regressor, random forest …
Blasting mechanics revisited: Blasting design standards
— 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 …
Blasting Impact on Environment and their Control Measure Techniques …
Controlled blasting methods are used to control adverse impacts of blasting in the environment also it help in the better fragmentation of the rock [6]. There are various controlled blasting methods: 1. ... These control blasting techniques can be apply in any of the large open pit mines to reuse the impact Some of the important method are ...
Review of Empirical and Intelligent Techniques for …
— 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 []. ...
Harmonizing Blasting Efficiency: A Case Study on Evaluation …
— Fragmentation achieved after the blast occurred is a significant parameter for determining optimal blasting. In most situations, vibration and fragmentation are linked, …
blasting techniques for better fragmentation of stone
blasting techniques for better fragmentation of stone. Quarry blasting techniques - Royex System. ... blasting techniques in stone metal quarries in india XSM. blasting techniques for better fragmentation … . blasting techniques for better fragmentation of stone ... It encapsulates theoretical and practical aspects of drilling and ...
Prediction of blasting mean fragment size using support …
— To control and estimate the blasting MFS, two types of SVR-based techniques, i.e. v-SVR and e-SVR, are employed. Then, five types of optimal algorithms …