scholarly journals Substantiation of parameters of mine working drivage with blasting technique and cleaning charges in advance cutting holes

2021 ◽  
Vol 5 (4) ◽  
pp. 336-348
Author(s):  
V. I. Lyashenko ◽  
O. E. Khomenko ◽  
M. N. Kononenko
Keyword(s):  
High Performance ◽  
Blast Hole ◽  
Practical Experience ◽  
Ore Deposits ◽  
Complicated Structure ◽  
Emulsion Explosive ◽  
Emulsion Explosives ◽  
Solid Media ◽  
Design Options ◽  
Scientific Achievements

Drilling and blasting operations (D&B) are the most difficult and laborious operations in the process of mineral extraction, requiring permanent development and upgrading of methods and equipment. The aim of the study is to substantiate the parameters of drilling and blasting drivage of horizontal and inclined (up to 12o) mine workings on the basis of high-performance self-propelled equipment and new designs of box cuts with cleaning explosive charges (0.2 kg of 6ZhV ammonite), placed in advance holes of 65 to 105 mm in diameter. The paper presents the results of the analysis of practical experience and scientific achievements in the field of drilling-andblasting rupture of solid media and continuum mechanics. The need for new designs of box cuts, reliability of which in the formation of high-quality (clean) cut cavity reaches 0.95-1.00, was substantiated. New design options of box cuts have been developed, the peculiarity of which consists in provision of sufficient compensation (peripheral) volume with the use of blast hole cut charges for blasting rupture of trapezoidal partitions, with the compensation volume factor of 2.50 to 1.34. Promising areas of research were shown using the example of complicated structure ore deposits and large faults in the Kirovograd ore district and crystalline rocks of the Ukrainian shield at the following mines of Ukraine: PJSC KZhRK, CJSC Sukhaya Balka (Kryvyi Rih), Vostok-Ruda LLC, SE VostGOK (Zheltye Vody), CJSC ZZhRK, etc. Promising areas of research were proposed using the example of complicated structure ore deposits typically formed at the junction of large faults; besides, the use of environmentally friendly emulsion explosives and self-propelled emulsion explosive chargers was recommended.

scholarly journals Application of the emulsion explosives in the tunnels construction

2019 ◽  
Vol 123 ◽  
pp. 01039 ◽  
Author(s):  
Oleh Khomenko ◽  
Maksym Kononenko ◽  
Inna Myronova ◽  
Mykola Savchenko
Keyword(s):  
Blast Hole ◽  
Hazard Index ◽  
Emulsion Explosive ◽  
Technical Standards ◽  
Emulsion Explosives ◽  
Atmospheric Air ◽  
Technical Parameters ◽  
Safety Requirements ◽  
Scientific Technical

The analysis has been made of the technical parameters of the existing passport for drilling and blasting operations (DBO) in terms of compliance with labour safety requirements and scientific-technical standards. The methodology for constructing the DBO passport has been developed, which takes into account the areas of blast-hole groups and the properties of emulsion explosives. The type of the cut has been analysed, modelled and accepted for use, which corresponds to the conditions of tunnelling as much as possible. The zones of deformation and fracturing in the massif around blast-hole charges have been simulated. The level of decrease in the hazard index for atmospheric air has been set when using the emulsion explosive Ukrainit-PP instead of TNT-containing charge – Ammonite No.6 ZhV.

A method to improve the quality of rock preparation for extraction with emulsion explosives in open-pit mines with high benches

2022 ◽  
pp. 62-67
Author(s):  
I.A. Pytalev ◽  
D.V. Domozhirov ◽  
E.E. Shvabenland ◽  
A.A. Prokhorov ◽  
V.V. Pronin
Keyword(s):  
Charge Density ◽  
Blast Hole ◽  
Production Capacity ◽  
Open Pit ◽  
Emulsion Explosive ◽  
Mining Operations ◽  
Emulsion Explosives ◽  
Density Control ◽  
Methodological Principles

Increasing the production capacity of open-pit and strip mines while ensuring the efficiency of the mining enterprise can be achieved through enhancing the quality of rock preparation prior to excavation. The use of emulsion explosives and the transition to the high-bench technology can reduce the cost of mining operations by optimizing the drilling and blasting parameters. The article reviews methods to improve the efficiency of rock preparation for extraction based on the applicable scientific and methodological principles and it proposes a method to regulate the density of emulsion explosives. Schemes are presented for calculation of drilling and blasting parameters when implementing technical measures aimed at improving the blasting quality through rock preparation for extraction in conditions of overburden and mining operations with bench height of 15 m and higher. Parameters of drilling and blasting operations on high benches are justified with differentiation of the charge density along the length of the blast hole by controlling the delivery of the gas-generating additive. A simulation has been performed and the results of pilot tests of the emulsion explosive charge density control at the Ural deposits are presented.

ON-THE-FARM TESTS OF RECOMMENDATIONS AND VETERINARY AND SANITARY PREVENTION MEASURES OF CATTLE NECROBACILLOSIS

1970 ◽  
pp. 62-64
Author(s):  
М. G. Vinnikov ◽  
R. N. Melnik ◽  
S. А. Grin ◽  
А. Ya. Samuylenko ◽  
N. V. Melnik ◽  
...  
Keyword(s):  
Infectious Diseases ◽  
Production Process ◽  
Dairy Farm ◽  
Practical Experience ◽  
Moscow Region ◽  
Prevention Measures ◽  
Sex Composition ◽  
Therapeutic Measures ◽  
Age And Sex ◽  
Scientific Achievements

The system of veterinary and sanitary measures in the CJSC "Makeevo" of the Zarayskiy municipal district of the Moscow region was studied during 2015-2016. The tests were carried out on 2232 cattle with age and sex composition: 965 cows, 206 heifers, 186 heifers (2014 year of birth), 52 bulls (2014 year of birth,) 426 heifers (2015 year of birth), 397 male calves (2015 year of birth). The system of veterinary and sanitary measures to prevent infectious diseases of cattle have been developed on the basis of modern scientific achievements, taking into account many years of practical experience in Russia, includes a set of measures: an analysis of the current situation in the farm; identification of urgent priority measures, specialists training on the farm, monitoring of the proposed measures implementation; elaboration of the farm development plan. The results of the recommendations production tests and the system of veterinary and sanitary measures on number of cattle in the dairy farm enterprise through the modernization of the production process are presented. Application of organizational-economic, sanitary, diagnostic, preventive and therapeutic measures was allowed to protect 99.25% of animals from necrobacteriosis.

Enlightment of “May 20” Explosion Accident

2014 ◽  
Vol 1082 ◽  
pp. 391-394 ◽  
Author(s):  
Xing Hua Xie ◽  
Lei Wang ◽  
Hui Sheng Zhou
Keyword(s):  
Thermal Decomposition ◽  
Production Process ◽  
Ammonium Nitrate ◽  
Hot Spots ◽  
Hot Spot ◽  
Decomposition Mechanism ◽  
Heat Accumulation ◽  
Emulsion Explosive ◽  
Emulsion Explosives

This paper introduces the "5.20" of the emulsion explosive incident and analysis the cause of the accident. Based on the production of explosion accident summarizes the security problems of emulsion explosive production process, and relevant measures are put forward. Combining the decomposition mechanism of ammonium nitrate in the emulsion explosives and the lessons from the production of emulsion explosives explosion, the conditions of the emulsion explosives (matrix) thermal decomposition in the emulsifier are given that are the formation of hot spot and the accumulation of heat. Then the factors of hot spots generated in the production of emulsion explosives and the occurred conditions of the heat accumulation are analyzed and summarized.

Experimental Study on the Influence of other Factors on Compression Resistance Performance of Emulsion Explosives in Deep Water

2014 ◽  
Vol 535 ◽  
pp. 729-733
Author(s):  
Lei Liu ◽  
Qiang Liu ◽  
Li Cheng
Keyword(s):  
Experimental Study ◽  
Water Content ◽  
Deep Water ◽  
Experimental Results ◽  
Paraffin Wax ◽  
Emulsion Explosive ◽  
Emulsion Explosives ◽  
Small Influence ◽  
Resistance Performance ◽  
Compression Resistance

Since oil phase materials, oxidizer, and water are important components of emulsion explosive, their influences on compression resistance performance of emulsion explosives in deep water was studied by using reusable experiment device to simulate the deep charging environment. The experimental results show that with the equivalent content of the oil phase material, the sequence of three oil phase types of emulsion explosives from good to bad in terms of compression resistance performance and explosion performance in deep water are composite wax, composite wax and machine oil, paraffin wax, vaseline and machine oil. With the equivalent content of oxidant, the type of oxidant species has quite small influence on compression resistance performance and explosion property. Within a certain range, water content has small influence on compression resistance performance, and explosion performance increases with the increasement of water content, while it significantly decreases with water content increasing to a certain amount.

scholarly journals Enhancement of Explosive Welding Possibilities by the Use of Emulsion Explosive/ Rozwój Mozliwości Łączenia Wybuchowego Przez Użycie Emulsji Wybuchowych

2014 ◽  
Vol 59 (4) ◽  
pp. 1587-1592 ◽  
Author(s):  
B. Zlobin ◽  
V. Sil’Vestrov ◽  
A. Shtertser ◽  
A. Plastinin ◽  
V. Kiselev
Keyword(s):  
Thin Layer ◽  
Physical Properties ◽  
Detonation Velocity ◽  
Explosive Welding ◽  
Hardened Steel ◽  
Explosion Welding ◽  
Thin Layers ◽  
Emulsion Explosive ◽  
Emulsion Explosives ◽  
Thermo Physical Properties

Abstract Explosive welding is an effective method of joining of various metals and alloys. However, when the materials with very different strength and thermo-physical properties are welded or thin-layer cladding is performed, the difficulties occur which call for extra investigations. In the present paper, with the couples of steel / carbide composite and copper / hardened steel used as examples, under study were the peculiarities of bonding formation by the explosive welding of metals with highly differing properties. The experiments were carried out with emulsion explosive containing hollow micro-spheres and detonating in thin layers with the low (2 - 3 km/s) detonation velocity. Obtained results show that the emulsion explosives enable to extend the explosion welding potentiality.

Evaluation of the Effect of Misalignment and Profile Modification in Face Gear Drive by a Finite Element Meshing Simulation

2003 ◽  
Author(s):  
Sandro Barone ◽  
Leonardo Borgianni ◽  
Paola Forte
Keyword(s):  
Finite Element ◽  
High Performance ◽  
Load Sharing ◽  
3D Models ◽  
Practical Experience ◽  
Contact Length ◽  
Face Gear ◽  
Design Standards ◽  
Element Analysis ◽  
Contact Algorithm

Face gear drives have many advantages over other cross axis transmissions especially in high performance applications. The lack of published design experience and design standards make their design difficult. This is mainly due to the complex geometries and to the lack of practical experience. For these reasons face gears have not been used for long. This work is aimed at investigating the behavior of a face gear transmission considering contact path under load, load sharing and stresses, for an unmodified gear set including shaft misalignment and modification on pinion profile. The investigation is carried out by integrating a 3D CAD system and a FEA code, and by simulating the meshing of pinion and gear sectors with three teeth, using contact elements and an automated contact algorithm. The procedures followed to create the 3D models of teeth in mesh are described and finite element analysis results discussed showing the differences between unmodified, modified and misaligned teeth. Results show the influence of load on theoretically calculated contact paths, contact areas, contact length and load sharing. The differences with respect to the ideal case are sometimes remarkable. Further developments are discussed.

scholarly journals Effect of aluminium additives on selected detonation parameters of a bulk emulsion explosive

2020 ◽  
pp. 99-113
Author(s):  
Bartłomiej Kramarczyk ◽  
Mateusz Pytlik ◽  
Piotr Mertuszka
Keyword(s):  
Detonation Velocity ◽  
Free Field ◽  
Aluminium Content ◽  
Velocity Measurements ◽  
Emulsion Explosive ◽  
Emulsion Explosives ◽  
Air Blast ◽  
Explosive Strength ◽  
Detonation Parameters

The article presents an assessment of the influence of aluminium granules content on selected detonation parameters of a chemically sensitised bulk emulsion explosive. The analysis covered determination of relative explosive strength using a ballistic mortar and Trauzl blocks, free field air blast tests and detonation velocity measurements. Five types of emulsion explosives with differing aluminium content were tested at loadings of 0, 1, 3, 5 and 7%.

Full-scale tests and application of NPGM emulsion explosive at ALROSA

2021 ◽  
pp. 58-62
Author(s):  
I. F. Bondarenko ◽  
R. Ya. Nikitin ◽  
I. V. Zyryanov
Keyword(s):  
Production Efficiency ◽  
Oil And Gas ◽  
Underground Mining ◽  
Investment Project ◽  
Full Scale ◽  
Underground Mines ◽  
Open Pit ◽  
Processing Plant ◽  
Emulsion Explosive ◽  
Emulsion Explosives

ALROSA performs blasting operations mainly using explosives manufactured on the spot. Considering modern trends of using local manufacture explosives, Company’s experience of application of emulsion explosives, as well as prompt introduction of technological innovations, novel process solutions are utilized in manufacture and use of emulsion explosives. To this effect, Udachny Mining and Processing Plant constructed and commissioned a plant to manufacture non-explosive components for emulsion explosives within the Plant’s infrastructure area. Emulsion explosives enable blasting in open pit and underground mines which are assumed hazardous in terms of oil and gas shows. Within the framework of technical upgrading at MMLT-500-PR Plant, the investment project on construction and commissioning of a modular production line to manufacture packaged emulsion explosives has been implemented. The field trials of NPGM grade emulsion explosive has proved the economic and production efficiency of blasting using this explosive in open pit and underground mining. This article presents the results of testing and application of NPGM emulsion explosive during blasting in open pit and underground mines of ALROSA. The outcomes of pilot explosions using this type explosive as the main borehole and chain charges, as well as intermediate detonators in full-scale conditions of an underground mine and in an open pit are described. The proposed technology features higher operational efficiency and is applicable in various geotechnical conditions of mineral mining.

Dependence of Critical Diameter of Emulsion Explosive on Density in Steel Confinement

2013 ◽  
Vol 8 (3) ◽  
pp. 128-134
Author(s):  
Sergey Rafeichik
Keyword(s):  
Reaction Zone ◽  
Acoustic Impedance ◽  
Detonation Front ◽  
Initial Density ◽  
Critical Diameter ◽  
Emulsion Explosive ◽  
Emulsion Explosives ◽  
Minimum Diameter ◽  
Zone Length ◽  
Strong Confinement

Emulsion explosives (EMX) based on fine emulsion matrix are characterized by high detonation ability. Critical diameter (as minimum diameter when detonation occurs) and reaction zone length are known in the case of thin confinement with low acoustic impedance. The dependence of critical diameter of EMX in steel confinement with high acoustic impedance was examined in the range of initial density 0,75–1,37 g/cm3 . Density was varied by the concentration of glass microballoons, which were used as the sensitizer. It was shown experimentally, that characteristic value is /2 1 cr R d a  in the case of strong confinement. This can be due to the decrease of detonation front curvature. Comparison was made between the values of critical diameter in weak and strong confinement. The main distinction is that such dependence in strong confinement is lower and almost monotonic. This can indicate the influence of some processes besides lateral rarefaction wave. Period of reaction is closely connected with critical diameter and reaction zone length. Model based on heterogeneous kinetic of heating of emulsion surrounding single microballoon was proposed to describe the experimental dependence of the reaction zone time of EMX on concentration of microballons

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