Modelling the size of the crushed zone around a blasthole

Esen, Sedat; Onederra, Italo; Bilgin, Hasan

doi:10.1016/s1365-1609(03)00018-2

Cited by 128 publications

(55 citation statements)

References 10 publications

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“…As shown in Figure 1, theoretical researches and experiments indicate that the diameter of crushed zone is about 3-5 times that of a borehole, and the diameter of fractured zone is around 10-15 times that of borehole. 27,28 That means shock wave induced by blasting is usually within the range of about 0.21-1.05 m in diameter (for a typical 70-mm borehole), which is even smaller than diameter of a viaduct pier. Therefore, ground vibration induced by a pier-soil interaction can be analyzed in a similar way to blast-induced ground vibration.…”

Section: Ground Vibrationmentioning

confidence: 99%

Experimental study on ground vibration attenuation induced by heavy freight wagons on a railway viaduct

Luo

Zhuang

et al. 2018

Journal of Low Frequency Noise, Vibration and Active Control

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Studies on ground vibration induced by railway operation usually focused on wagons running on ground or abutments, while vibration from a railway viaduct is often assumed to be much lower. Based on field test in the vicinity of a heavy freight railway viaduct above Shenshan Village, China, the attenuation of ground vibration induced by heavy freight wagons for coal transportation is studied. And evaluation is conducted on an adjacent house to access vibration disturbance to residents near a viaduct. Propagation and attenuation of vibration induced from viaduct are studied by analyzing peak particle velocity and spectra of ground and house vibration in the vicinity of the viaduct. Vibration signals were collected for 34 trains with different train speed and wagon weight. In all monitored situations, vertical vibration is generally larger than horizontal vibration. The relationship between distance to pier and PPV is revealed by a power function modified from Sadovskii formula with high correlation factor. Analysis also indicates a much lower dominant frequency induced by low-speed trains with or without acceleration than normal speed trains. A dramatic amplitude reduction is shown within frequency between 25 Hz and 35 Hz when train speed is reduced. Empty wagons also show smaller amplitude in most frequency bands, with significant difference in 15-25 Hz. Analysis on the house also shows larger vibration in vertical than horizontal, and vibration amplitude in some frequency bands has exceeded relative criteria. Analysis result shows significant ground and house vibration effect form a viaduct, and piers should be considered as vibration sources for ground and houses in future studies.

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Section: Ground Vibrationmentioning

confidence: 99%

Experimental study on ground vibration attenuation induced by heavy freight wagons on a railway viaduct

Luo

Zhuang

et al. 2018

Journal of Low Frequency Noise, Vibration and Active Control

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“…Basing on these researches, leading scientists all over the world suggest their methodic, which take into consideration geological and mining conditions (Szuladzinski, 1993;Djordjevic, 1999;Esen et al, 2003;Vokhmin et al, 2014;Kurchin et al, 2015).…”

Section: Development Of Blasting Workmentioning

confidence: 99%

A brief history of the development of blasting and the modern theory of rock breaking

Kirsanov

Вохмин

Курчин

2016

J.Degrade.Min.Land Manage.

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Abstract:The article is devoted to the task today to improve the effectiveness of blasting during construction of horizontal and inclined mine excavations. Construction of new and reconstruction of existing mines requires large volume of excavation works, which length can reach tens of kilometers for only one project. Drilling and blasting workings allow not only to break out rocks from a frontal part of an excavation, but also cause an internal effect, which can lead to undesired damage that, in turn, often lead to increased expenses for excavation operations and safety problems for personnel. Calculation methods for blasting and explosion operations is a topical issue in mining industry as they allow to improve characteristics of excavation works and safety of explosion operations. Dozens of scientists offer their design, which reflects the vision of the problem and its solution. There are many methods for calculating the parameters of drilling and blasting, but so far not developed a uniform methodology of calculation, which would encompass all the factors and explained the mechanism of formation of cracks around the explosive charge and the process of breaking rock. The paper presents a novel methodology for calculations for blasting and explosion operations. That methodology comprises various specifics of rock geology and mining engineering during works in horizontal and vertical excavations. In this paper given an algorithm for calculation two main areas of destruction: crushed zone and fracturing zone. In addition, article outlines main aspects of Mining Engineering Development from Antiquity until present days and presents the dynamic of mineral resources.

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“…Most investigators hold the view that the radius of crushed zone r 1 is about three to five times the blasthole radius, and the radius of fractured zone r 2 is around ten to fifteen times the blasthole radius [36,38]. For the blast of stope holes, buffer holes and contour holes under the condition of existing free surface provided by the blast of the previous delay, the equivalent elastic boundary is newly formed excavation contour.…”

Section: Equivalent Simulation For Coupling Of Blasting Load and Tranmentioning

confidence: 99%

Dynamic response of rock mass induced by the transient release of in-situ stress

Yang

Peng

et al. 2012

International Journal of Rock Mechanics and Mining Sciences

152

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Modelling the size of the crushed zone around a blasthole

Cited by 128 publications

References 10 publications

Experimental study on ground vibration attenuation induced by heavy freight wagons on a railway viaduct

Experimental study on ground vibration attenuation induced by heavy freight wagons on a railway viaduct

A brief history of the development of blasting and the modern theory of rock breaking

Dynamic response of rock mass induced by the transient release of in-situ stress

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