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Статті в журналах з теми "Explosive-mechanical destruction"
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Terentiev, Oleg Markovich, and Pavel Anatolievich Gontar. "IMPLEMENTATION OF THE COMBINED METHOD OF ROCK DESTRUCTION WITH EXPLOSIVE-MECHANICAL MEANS." Theoretical & Applied Science 12, no. 04 (April 30, 2014): 44–48. http://dx.doi.org/10.15863/tas.2014.04.12.8.
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Ozhigin, S. G., I. K. Chunuev, R. A. Musin, and S. G. Tyan. "Substantiation of the specific energy intensity of drilling as a criterion characterizing the explosive destruction of rocks on the example of the Koktaszhal." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 321, no. 2 (March 2, 2022): 79–86. http://dx.doi.org/10.31643/2022/6445.20.
Повний текст джерелаАнотація:
Drilling and blasting operations are one of the most important components of the mining industry. Currently, further improvement and optimization of technological processes at mining enterprises are possible mainly due to the determination and constant monitoring of the mining and technological properties of the rock mass – their drillability, explosivity and exaviability. A prospective assessment of the explosivity of rocks in the massif, which is the basis for designing and calculating the parameters of the DBO, is currently possible only using the energy parameters of technological work. The article provides information on methods for studying the strength and elastic characteristics of rocks in natural occurrence. The results of the study of the relationship between the specific energy intensity of drilling and explosive destruction of rocks are presented. The correlation between the specific energy intensity of drilling and the propagation velocity of elastic longitudinal waves is also considered. A comparative analysis is carried out between the traditional calculation of the explosive index using the results of laboratory studies on the physical and mechanical properties of the rocks of the Koktaszhal deposit and the calculation of the explosive destruction index taking into account the energy parameters of drilling. The validity of the use of the specific energy intensity of drilling as a criterion characterizing the explosive destruction of rocks in the design of drilling and blasting operations is shown.
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Nykyforova, Valentyna, Ernest Yefremov, Ihor Kratkovskyi, and Volodymyr Kurinnyi. "Influence rocks mass and explosives properties on dissipative energy losses during blasting." E3S Web of Conferences 109 (2019): 00064. http://dx.doi.org/10.1051/e3sconf/201910900064.
Повний текст джерелаАнотація:
The factors affecting the energy explosion loss on rock crushing on con-tact with explosives have been established. This makes it possible to substantiate ways to increase low explosion efficiency. Theoretical estimates of the explosion energy losses during the rocks destruction have been carried out taking into account the explosives properties and heterogeneities in the rocks structure. It has been established that homogeneities in the form of mineral grains of various strengths determine the mechanism of their destruction and crushing during blusting. A thermodynamic loss has been estimated during the expansion of gaseous detonation products, on which the maximum explosion work depends. These losses characterize the theoretical possibility of the transfer of energy stored in an explosive into mechanical work. The explosion losses associated with the origination of shock waves in rocks are also have been determined.
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Georgy S., Bordonskiy. "Influence of Liquid Inclusions to Explosive Instability of Ice." Scholarly Notes of Transbaikal State University 16, no. 3 (September 2021): 134–39. http://dx.doi.org/10.21209/2658-7114-2021-16-3-134-139.
Повний текст джерелаАнотація:
The influence of the nuclei of the liquid phase arising during mechanical deformations of polycrystalline ice at temperatures below -40 ... -45 C on its explosive instability is considered. The nucleus of the liquid phase appear in ice when part of the hydrogen bonds are broken when high pressure is applied to ice crystals. The resulting clusters can have characteristics close to those of bulk metastable water. It is known that such water in the region of negative temperatures has anomalous thermodynamic characteristics. In particular, at a temperature of -60 C and a pressure of 100 MPa, there is a second critical point of water for the liquid-liquid transition. It was found that the transition occurs between the two types of water LDL (low density water) and HDL (high density water), with the Widom line coming out into the one-component region of the water phase diagram. This line is the locus of increased fluctuations in entropy and density. Near atmospheric pressure, the temperature on the Widom line is -45 C. If the pressure inside the ice and its temperature turn out to be close to the line of coexistence of LDL and HDL, then liquid inhomogeneities can become a source of mechanical instability of the medium due to the growth of fluctuations in the energy of molecules and destruction of the ice structure. Such conditions can occur at temperatures below -45 C and pressures above 100 MPa.
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Viktorov, S. D., A. E. Frantov, and I. N. Lapikov. "Development of the Potential for the Cheap Explosives in Russia." Occupational Safety in Industry, no. 8 (August 2021): 7–14. http://dx.doi.org/10.24000/0409-2961-2021-8-7-14.
Повний текст джерелаАнотація:
The most accessible and popular means of destruction of rocks, which are used in the extraction of ores, non-metallic minerals, mining and chemical raw materials, are the cheap explosives, in the Russian technical literature called granulites or AS-DT, in the foreign — ANFO. The article presents the research carried out to improve the formulation and explosive properties of granulites A6, Igdanit, Igdanit-P, A3. They are aimed at using the modern raw material base, increasing the efficiency of blasting, the safety of manufacturing and loading drill holes and boreholes, maintaining a balanced composition, and preserving physical stability, providing energy potential with secondary aluminum additives. Further development of granulites is aimed at creating a line of formulations using saltpeter with variable technical parameters, mixed fuels in the form of liquid (waste oil products, fuel mixtures, diesel fuel) and solid (coal powder, coke fines, rubber crumbs) phases. Based on the use of the cheap explosives in the formulation of recycling materials formed at the mining enterprises, blasting technologies are being improved, and mixing and charging equipment is being developed. The proposed approaches are aimed at maintaining high technical and economic indicators of the use of explosives, ensuring the stationarity of the explosive process and the completeness of detonation of granulites reducing the sensitivity to mechanical and thermal influences, and maintaining susceptibility to initiation by practical means of an explosive pulse. When compiling the new formulations of granulites to reduce production costs, it is proposed to use the most economical types of oxidants and fuels with ensuring quality control of mixing components with different technological properties and conditioning the temperature-viscosity properties of the waste oil products.
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Bayseytov, D. A., M. I. Tulepov, Zh A. Amir, A. Ye Orazbayev, and S. Tursynbek. "Study and Development of the Components of Gas Generator Compositions Based on the Ammonium Nitrate to Improve Blasting Operations Safety." Occupational Safety in Industry, no. 11 (November 2021): 47–52. http://dx.doi.org/10.24000/0409-2961-2021-11-47-52.
Повний текст джерелаАнотація:
The article is devoted to the study and development of the components of gas generator compositions based on the ammonium nitrate to improve safety of blasting operations. This is primarily due to the low cost of ammonium nitrate, low sensitivity to mechanical and detonation effects and a significantly lower content of harmful compounds in the combustion products compared to the analogues. PA-4 aluminum powder was used as fuel, carbon black powder — as a gas-forming agent. The effect was studied concerning different amounts of aluminum powder on the combustion characteristics of a gas generator composition based on the ammonium nitrate. Calculated and experimental data showed that it is unreasonable to introduce more than 5 % of aluminum into the composition. According to the results of the conducted study, a gas generator composition based on the ammonium nitrate was developed to increase blasting operations efficiency and safety. Laboratory and polygon studies confirmed the efficiency and safety of using gas generator compositions at the destruction of stone. Destruction of the stone occurred without scattering of individual fragments, formation, and propagation of an air shock wave. Thus, the urgent task is to ensure blasting operations safety using gas generator compositions, which will allow to eliminate the formation of harmful, toxic gases and the high explosive effect.
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Wysocki, Krzysztof. "Engineering support for the mobility of the Ground Forces of the Russian Federation." Scientific Journal of the Military University of Land Forces 199, no. 1 (March 18, 2021): 137–54. http://dx.doi.org/10.5604/01.3001.0014.8116.
Повний текст джерелаАнотація:
The article addresses selected aspects of supporting the mobility of the Ground Forces in the Armed Forces of the Russian Federation. The experience of contemporary armed conflicts in which Russian forces were involved confirmed the need to maintain subunits, guaranteeing maneuver freedom in the area occupied by the enemy. The study aims to present explanations concerning: the role and tasks of the engineering troops of the Russian Federation in contemporary armed conflicts, characteristics of the currently used methods of performing mine barriers, namely mechanical, electromechanical, explosive, manual, and combined ones. Also, the essence of engineering activities according to the views adopted in the Armed Forces of the Russian Federation, the content of engineering support for mobility in tactical departments, and the interpretation of basic concepts, and the role of engineering units and subunits in the activities in question are presented. Besides, the executive potential of selected organizational and functional structures of engineering units, their purpose, and the possibility of implementing individual engineering tasks in tactical activities related to maneuvering and displacement are described. In the aspect of the issue of the impact of engineering barriers and destruction on the pace of the enemy’s attack, an analysis of the execution potential and tactics of operations (doctrinal patterns of combat operations) of a potential enemy (the other party and its capability of supporting the mobility of own troops in the implementation of engineering projects related to crossings (paving) in dams, through natural obstacles and areas of destruction as well as demining terrain and objects) was performed.
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Luo, Feng, Guodong Li, and Hao Zhang. "Mechanical behavior and damage mechanism of loaded coal and rock." World Journal of Engineering 14, no. 3 (June 12, 2017): 200–207. http://dx.doi.org/10.1108/wje-03-2017-0059.
Повний текст джерелаАнотація:
Purpose The purpose of this paper is to obtain the mechanical behavior and damage mechanism of the coal and rock near the stope under the stress state and stress paths of the surrounding rock with the dynamic mining. Design/methodology/approach Through the three-axial compression test and the uniaxial compression test by meso experiment device, the mechanical behavior and fracture evolution process of coal and rock were studied, and the acoustic emission (AE) characteristics under uniaxial compression of the coal and rock were contrasted. Findings Under the three-axial compression, the strength of coal and rock enhance significantly by confining pressure. The volume of outburst coal shows obvious stages: compression is followed by expansion. The coal first appear to undergo compaction under vertical stress due to volume decrease, but with the development of micro- and macro-cracks, the specimens appeared to expand; under the uniaxial compression, through the comparison of stress–strain relationship and the crack propagation process, stress drop and fracture of coal have obvious correlation. The destruction of coal was gradual due to the slow and steady accumulation of internal damage. Due to the influence of the end effect, the specimens show the “conjugate double shear failure”. The failure process of the coal and rock and the characteristics of the AEs have a corresponding relationship: the failure causes a large number of AE events. Before the events peak, there was an initial stage, calm growth stage and explosive growth stage. There were some differences between the rock and coal in the characteristics of the AE. Originality/value These research studies are conducted to provide guidance on the basis of mine disaster prevention and control.
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Kulynych, Viktoriia, Valerii Chebenko, Ruslan Puzyr, and Iryna Pieieva. "Modelling the influence of gaseous products of explosive detonation on the processes of crack treatment while rock blasting." Mining of Mineral Deposits 15, no. 3 (September 2021): 102–7. http://dx.doi.org/10.33271/mining15.03.102.
Повний текст джерелаАнотація:
Purpose is mathematical modeling of fracturing as well as influence of gaseous products of explosive detonation on the changes in rock strength. Methods. Mathematical model, using foundations of Griffith theory, has been developed. To explain conditions of bridge formation while exploding lead azide charges, a two-stage description of solid particle condensation at a crack surface and inside it has been applied using the smoothed particle hydrodynamics. The analysis, involved electronic microscope, has helped verified the results experimentally. Findings. The effect of rock mass disturbance, resulting from explosive destruction, is manifested maximally right after the action. Subsequently, it decreases owing to the gradual relaxation of the formed defects. Therefore, an urgent problem is to develop ways slowing down strength restore of the blasted rock mass fragments. The process of rock fragment strength restoring may be prevented by microparticles getting into the microcrack cavities together with the detonation products. The research simulates their action. The data correlate to the simulation results confirming potential influence of the blasted rock on the dynamics of changes in the strength characteristics of the rock mass. Various compositions of charges with shells made of inert solid additions have been applied which solid particles can avoid the process of microcrack closure. Originality. For the first time, the possibility of deposition formation within rock micro- and macrocracks has been proposed and supported mathematically. Practical implications. Strength properties of the finished product and the energy consumption during impulse loading as well as subsequent mechanical processing of nonmetallic building materials depend on the strength properties of rock mass fragments. Hence, the ability to control the strength restore has a great practical value. Moreover, it can be implemented during the blasting operations.
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Ji, Qing, Zhijun Wang, Jianya Yi, and Xuezhi Tang. "Mechanical Properties and a Constitutive Model of 3D-Printed Copper Powder-Filled PLA Material." Polymers 13, no. 20 (October 19, 2021): 3605. http://dx.doi.org/10.3390/polym13203605.
Повний текст джерелаАнотація:
Three-dimensional printing is becoming increasingly popular because of its extensive applicability. However, printing materials remain limited. To determine the mechanical properties of polylactic acid (PLA) and copper powder-filled polylactic acid (PLA-Cu) materials subjected to static and dynamic loading, stress–strain curves were obtained under the conditions of different strain rates using a universal material testing machine and a separated Hopkinson pressure bar experimental device. Scanning electron microscopy (SEM) was used to analyze the micro-morphology of the quasi-static compression fracture and dynamic impact sections. The results revealed that the yield stress and elastic modulus of the two materials increased with increasing strain rate. When the strain rate reached a critical point of 0.033 s−1, the rate of crack propagation in the PLA samples increased, resulting in the material undergoing a change from ductile to brittle. The strength of the material subjected to dynamic loading was significantly higher than that subjected to quasi-static loading. The SEM image of the PLA-Cu material revealed that copper powder was evenly distributed throughout the 3D-printed sample and that stress initially began to concentrate at the defect site corresponding to the interface between the copper powder and PLA matrix; this resulted in comparatively lower toughness. This finding was consistent with the photographs captured via high-speed photography, which confirmed that the destruction of the specimen was accompanied by an explosive crushing process. Additionally, a Zhu–Wang–Tang constitutive model was used to fit the experimental results and establish a viscoelastic constitutive model of the material. By comparing the dynamic stress–strain curve to the theoretically predicted curve, we found that the established constitutive model could predict the mechanical properties of the PLA-Cu material with reasonable accuracy when the strain was below 7%.
Дисертації з теми "Explosive-mechanical destruction"
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Гонтарь, Павло Анатолійович. "Удосконалення технології механічного руйнування гірських порід використанням кумулятивного вибухового ядра". Doctoral thesis, Київ, 2017. https://ela.kpi.ua/handle/123456789/18700.
Повний текст джерелаАнотація:
Дисертаційна робота присвячена розробці нового енергоефективного вибухо-механічного способу руйнування гірських порід з використанням кумулятивного вибухового ядра. Розроблено математичну модель енергоємності руйнування гірських порід, що враховує параметри вибухо-механічного навантаження вибою і сукупність дії природної та внесеної технологічної тріщинуватостей. Створено повнорозмірний експериментальний пристрій для реалізації комбінованого вибухо-механічного руйнування гірських порід. Пристрій дозволив експериментально встановити зниження питомої енергоємності вибухо-механічного руйнування гірських порід від частоти навантажень кумулятивним вибуховим ядром (на 9…16 %) та температури вибуху (на 4…7 %). При цьому забезпечено зростання коефіцієнта корисної дії з 77 % до 80 % та продуктивності руйнування гірських порід на 9…14 %. Результати досліджень апробовано в технологічному процесі ПП «Давидівський гранкар’єр». Досягнуто зниження питомої енергоємності руйнування граніту з 201 до 188 кВт·год/м³ вибухо-механічним способом за рахунок доповнення природних тріщин внесеними технологічними кумулятивним вибуховим ядром.
Тези доповідей конференцій з теми "Explosive-mechanical destruction"
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Xiao, Qiang, and Bin Zhang. "Research on the Destruction System of Minitype Fuze Explosive Element." In 2018 International Conference on Mechanical, Electronic, Control and Automation Engineering (MECAE 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/mecae-18.2018.110.
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