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Готові списки джерел за темами / Blasthole charge

Добірка наукової літератури з теми "Blasthole charge"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Blasthole charge"

1

Yang, Renshu, Changda Zheng, Liyun Yang, Jinjing Zuo, Tonglei Cheng, Chenxi Ding, and Qing Li. "Study of Two-Step Parallel Cutting Technology for Deep-Hole Blasting in Shaft Excavation." Shock and Vibration 2021 (May 7, 2021): 1–12. http://dx.doi.org/10.1155/2021/8815564.

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In hard rock deep-hole blasting excavation, blastholes are rarely utilized due to the clamping effect of the lower rock, which affects excavation progress and restricts the development and application of deep-hole blasting technology. Cut blasting is a key to improving excavation speed. In this paper, a new cutting method designating the two-step cutting technology was presented. The blasthole was divided into upper and lower sections without changing the blasthole layout. The upper section was detonated first, creating sufficient free surface for the lower section, which was detonated secondly. This created a larger cavity and improved blasthole utilization. Results showed good blasting effects for two-step cutting technology through theoretical analysis and engineering applications. The blasthole utilization rate was 96.1% when the upper and lower specific charge ratio = 0.78. This paper provides a good reference for resolving the low blasthole utilization problem in deep-hole blasting of vertical shafts within a hard rock.

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2

Leshchinskiy, Alexandr, Evgeniy Shevkun, Yuriy Lysak, and Andrey Plotnikov. "Features of schemes of the explosive loosening, with big slowdowns." E3S Web of Conferences 192 (2020): 01024. http://dx.doi.org/10.1051/e3sconf/202019201024.

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The task of the article is to determine the influence of the blasting charge power on the intensity of preliminary destruction of the blasting block mass at long delays. Increase of the destruction radius r from the blasthole charges action at diagonal pattern of hole-by-hole blasting, caused by change of explosive charge energy or rock properties, decreases the number of stress waves passing in the vicinity of specific blast holes. They cause the rock disturbance in the pre-destruction area due to increasing of explosion energy absorption in the area of blasthole charges destruction. However, at the same time, the value of the predestruction factor increases. The calculation shows that 3.5 times increase of the blasthole charge destruction radius, reduces in 1.36 times the number of stress waves passing through the vicinity of specific blasthole charges, but the factor of pre-destruction intensity increases tenfold and the total impact of these factors – by a factor of 8.

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3

Umarov, Farkhodbek, Utkir Nasirov, Gafur Nutfulloev, Zoir Nazarov, and Lazizzhon Sharipov. "Improving the efficiency of tunneling underground mine workings with the use of blasthole charges with Munroe effect." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 3 (May 14, 2020): 15–23. http://dx.doi.org/10.21440/0536-1028-2020-3-15-23.

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Introduction. Various techniques of breaking rock by explosion have currently been developed when tunneling underground mine workings, but asymmetrically directed stress fields application is of the main interest. Research aim is to study explosion energy distribution and maximum concentration deep down the blasted rock mass. Blast energy concentration may be achieved by using the principle of cumulation in the hole back by means of changing the design of the blasthole explosive charge. Methodology. Based on the analyzed literature and theoretical research it is recommended to use the design of a blasthole explosive charge with the use of Munroe effect, which makes it possible to increase the blasthole efficiency ratio (BER), reduce drilling activity, reach sharper design contours of mine workings and eliminate bootlegs. The action of blasthole explosive charges with Munroe effect has been theoretically investigated, hydrodynamic theory of cumulation has been studied, and the dependences have been determined between the liner’s collapsing angle alternation and the radius of the cone, its height, initial velocity, and cumulative jet velocity. Results. The main factors which determine the efficiency of the proposed new technique of blasting against the basic technique are the blasthole efficiency ratio, face advance pace after one blast, the amount of rock mass detached after one blast, and the granulometric composition of the blasted rock mass. Summary. The developed design of the blasthole explosive charge with Munroe effect makes it possible to increase BER, face advance per one cycle, and increase the amount of the broken rock mass.

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4

Sergei D., Viktorov, Zakalinskii Vladimir M., Shipovskii Ivan E., and Mingazov Rafael Ia. "New aspect of drilling development and application in today’s mineral extraction." Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal, no. 6 (September 24, 2020): 5. http://dx.doi.org/10.21440/0536-1028-2020-6-5-13.

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Introduction. The method of applying the factor of short period delay initiation in rock blasting and its effectiveness can be substantiated by the technical possibility of applying it for both conventional inter-row and current downhole delay intervals. The state of the art in blasting has made it possible to implement the technology of a short period delay. So it is rather relevant and extremely difficult to study of the technology’s aspects in full-scale production conditions. Methodology. This work analyzes the options for rock blasting and blasthole charges designs in order to find out how to implement them in a new and more effective way in modern conditions. A well-known method has been chosen, which combines the rock blasting method and the unconventional design of the blasthole charge. It is used as an example to demonstrate the possibility of expanding the practical range of the selected charge placement schemes. This work has been the first to introduce a hypothesis on the possibility of achieving the same effect in two different designs of blasthole charges, but "acting" in almost the same range of short period delay (SPD) use. The fact is that "vertical" distances between downhole short-delay detonators in a conventional blasthole charge (in this case, a single charge) and "horizontal" distances between parallel converged wells of a beam are almost the same. In this regard, it has become possible to focus not on its "internal" content on the "external" one and explain the features of these mechanisms by means of computer simulation. Due to the apparent specific character of conducting a blast in production conditions and intricate experimental observation, this approach is more realizable in practice and the only possible one. 12 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 6. 2020 ISSN 0536-1028 Results. It is proposed to test various methods of blasting (detonation) based on the idea of replacing (transforming, transferring) the explosion action of detonators ( ≥ 1) in a single well charge (conventionally large diameter) with the detonation of ( ≥ 1) lines of a beam of converged borehole charges of the corresponding small diameter. As soon as the number of beam charge design options increases, the range of research options that can lead to the results with improved quality expands significantly. To achieve this goal, the action of various configurations of charges with in-line short period delay blasting in a beam was studied. It should make it possible to come up to some recommendations for blast control. Summary. On the one hand, the proposed blast patterns show the technological departure from the traditional circular shape of the blast wave, on the other hand, they allow using the effect found in the course of numerical experiment for various purposes, in particular, to ensure blasting effect on (interaction with) design features of various mining methods and production systems in complex geomechanical environment

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5

Sher, E. N., L. V. Gorodilov, and A. G. Chernikov. "Loosening cone of an annular blasthole charge in soft ground." Journal of Mining Science 33, no. 5 (September 1997): 422–26. http://dx.doi.org/10.1007/bf02765616.

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6

Yang, Renshu, Shizheng Fang, Aiyun Yang, Huanzhen Xie, and Liyun Yang. "In Situ Stress Effects on Smooth Blasting: Model Test and Analysis." Shock and Vibration 2020 (January 7, 2020): 1–14. http://dx.doi.org/10.1155/2020/2124694.

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Most of the roadway excavation is completed by the drilling and blasting method. With the increase of buried depth, the existence of ground stress will generate a significant impact on the rock blasting, especially on the smooth blasting. In this study, self-made homogeneous similar materials and digital image correlation methods were used to determine influence of ground stress on the smooth blasting under uniform explosive charge parameters and various in situ stress conditions. The results show that the crack outline after blasting changes from zigzag to straight in shape, and multifractal calculation results of the rupture section between blastholes show that the fracture surface becomes flatter as ground stress increases, which is conducive to roadway formation. The strain and equivalent strain rate obviously decrease as the distance between the blasthole and measuring points increases. The same trend occurs as the confining pressure goes up. Meanwhile, a postexplosion acoustic wave test indicates that confining pressure inhibits damage of the retained rock, which is consistent with strain and equivalent strain rate results. Finally, we discussed the crack propagation mechanism of rock in smooth blasting.

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7

Gao, Qidong, Wenbo Lu, Zhendong Leng, Zhaowei Yang, Yuzhu Zhang, and Haoran Hu. "Effect of Initiation Location within Blasthole on Blast Vibration Field and Its Mechanism." Shock and Vibration 2019 (December 6, 2019): 1–18. http://dx.doi.org/10.1155/2019/5386014.

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In drill and blast, the explosive filled in each blasthole is cylindrically shaped and generally initiated by the detonator. Thus, the effect of the initiation location must be addressed, as it determines the detonation direction along the entire column explosive. In this paper, the effect of the initiation location on blast vibration field and its acting mechanism were comprehensively investigated through the theoretical, computational, and experimental approaches. The results indicate that the initiation location plays an important role in the blast vibration filed of the cylindrical charge. The underlying effect of the initiation location can be regarded as the combined results of the energy distribution and phase delay effects of the column explosive source. The behavior of the rock mass in the single-hole blasting experiment demonstrates that the explosion energy is preferentially transmitted to the forward direction of the detonation wave. The seed wave-based computation model verifies that owing to the phase delay effect, the blast vibration field of the cylindrical charge is not uniformly distributed and is strengthened at the forward direction of the detonation wave. The production blasting experiment indicates that the ground PPV under bottom initiation is 61.3%∼211.7% larger than that under top initiation. In addition, the effect of the initiation location is sensitive to the charge length L and the denotation velocity D. Meanwhile, the effect of the initiation location vanishes with distance. The present study provides valuable reference for understanding the effect of the initiation location on blast vibration in drill and blast.

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8

Yu, Jianxin, Zhibin Zhou, Xin Zhang, Xiaolin Yang, Jinxing Wang, and Lianhao Zhou. "Vibration Response Characteristics of Adjacent Tunnels under Different Blasting Schemes." Shock and Vibration 2021 (December 28, 2021): 1–13. http://dx.doi.org/10.1155/2021/5121296.

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The vibration caused by the tunnel blasting and excavation will harm the surrounding rock and lining structure of the adjacent existing tunnels. This paper takes a two-lane large-span highway tunnel as the research object, conducts on-site monitoring tests on the impact of vibration caused by the blasting and excavation of new tunnels on the existing tunnels under different blasting schemes, and analyses in detail the three-dimension vibration velocity by different excavation footages. From the vibration speed, it is concluded that the influence of the existing tunnel of the newly built tunnel blasting team is affected by various factors, such as distance, free surface, charge, and blasthole distribution. With different blasting schemes, the greater the amount of charge, the greater the vibration caused by blasting. Existing tunnels correspond to the front of the tunnel, and the axial and radial vibration peaks are greater than the vertical. Although the cut segment uses a less amount of explosive and has a less blasthole layout, there is only one free surface. Because of the clamping of the rock, it is compared with the other two segments. The vibration caused is the largest. Although the peripheral holes are filled with a large amount of explosive, the arrangement of the blast holes is relatively scattered and there are many free surfaces. Hence, the vibration caused is the smallest. Corresponding to the back of the tunnel face, since there is no rock clamp, the vibration caused by the cut segment is the smallest, and the vibration caused by the peripheral segment and the floor segment is relatively large. The vibration caused by the front explosion side is significantly greater than the vibration caused by the back explosion side. The vibration velocity caused by the unit charge of 1.5 m footage is greater than that of the 3.0 m footage. The vibration velocity caused by the unit charge of the cut segment is the largest, and the vibration velocity caused by the peripheral segment and the floor segment is smaller. The research results provide a reference for the blasting control of similar engineering construction.

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9

Ye, Hai Wang, Dong Ling Nong, Ting Li, and Jie Wang Ye. "Numerical Simulation of Mixed Emulsion Explosive Charging in Water-Filled-Hole." Advanced Materials Research 634-638 (January 2013): 3563–66. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.3563.

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When charging in water-filled-hole with emulsion mixed loading truck, if the charging hose can not reach the borehole bottom, there will be a water column in the charge. Emulsion explosive charging in water-filled-hole is simulated under three conditions with different water levels, charging velocity and hole diameter when the hose of the explosive mixed loading truck does not reach the hole bottom. The results show that explosive can not reach the bottom of the blasthole if the water depth exceeds the maximum effective range of the jet flow, which is proportional to charging speed and hole diameter, and there will exist a water column at the bottom of the hole. To prevent that, the distance between the hose outlet and the hole bottom must be shorter than the effective range when charging. Besides, increasing charging velocity also works.

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10

Borovkov, Iurii A., and Temur M. Iakshibaev. "THEORETICAL STUDIES OF CHANGES IN FRACTURE ZONES RADIUS IN THE ORE PILE OF HEAP LEACHING WITH CAMOUFL ET BLASTHOLE CHARGE EXPLOSION." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII GORNYI ZHURNAL 5 (August 6, 2019): 30–36. http://dx.doi.org/10.21440/0536-1028-2019-5-30-36.

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Більше джерел

Дисертації з теми "Blasthole charge"

1

Фролов, Олександр Олександрович. "Керування енергетичними потоками при вибуховому руйнуванні різноміцнісних масивів гірських порід на кар’єрах". Doctoral thesis, Київ, 2013. https://ela.kpi.ua/handle/123456789/7327.

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Частини книг з теми "Blasthole charge"

1

"excess(ive) (blasthole) charge." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 490. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_51976.

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2

"(blasthole) charger." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 132. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_21856.

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3

"(blasthole) hose charger." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 133. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_21872.

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4

"(blasthole) tube charger." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 133. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_21882.

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5

"ejector (blasthole) charger." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 458–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_50627.

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6

"compressed-air (blasthole) charger." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 265. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_33677.

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