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Date submitted2021-01-19
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Date accepted2021-07-27
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Date published2021-10-21
Geological and structural characteristics of deep-level rock mass of the Udachnaya pipe deposit
- Authors:
- Evgenii V. Serebryakov
- Andrei S. Gladkov
For hard rock massifs, structural disturbance is a key indicator of mining structure stability. The presence of intersecting structural elements in the massif reduces rock strength and leads to formation of potential collapse structures. In addition to that, disjunctive deformations that penetrate rock strata serve as channels for fluid migration and connect aquifers into a single system. It was established that the largest of them –faults of east-northeastern, northeastern and northwestern directions – form the kimberlite-bearing junction of the Udachnaya pipe. These faults represent zones of increased fracturing, brecciation and tectonic foliation, distinguished from adjacent areas by increased destruction of the rock mass. Specifics of tectonic fracture distribution within structural and lithological domains are determined by the presence of multidirectional prevailing systems of tectonic fracturing, as well as by differences in their quantitative characteristics. With some exceptions, the main systems form a diagonal network of fractures (northeastern – northwestern orientation), which is typical for larger structural forms – faults. Despite the differences in dip orientation of the systems, most of them correspond to identified directions, which is typical for both kimberlites and sedimentary strata. Overall disturbance of the massif, expressed in terms of elementary block volume, reaches its peak in the western ore body. For such type of deposits, friction properties of fracture structures have average values. Consideration of geological and structural data in the design and development of new levels of the deposit will allow to maintain the necessary balance between efficiency and safety of performed operations.
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Date submitted2014-07-12
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Date accepted2014-08-24
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Date published2014-12-22
The study of structural features of outburst coal seams
- Authors:
- V. N. Zakharov
- O. N. Malinnikova
A study of the structural features of outburst-dangerous and non-outburst dangerous coal layers was conducted. It was shown that coal taken from a sudden outburst zone has a significantly greater sorption surface than coal from the same layer which was not part of the sudden outburst. The size of the sorption surface of coal is affected by its history up to that point; thus the heating of the coal sample during its preparation enlarges its sorption surface. An electron microscope study of coal surfaces has shown that for coal from outburst-dangerous layers, a disturbed structure with a large quantity of fissures and partings the size of 1 micrometer is typical. Under the same enlargement, a coal structure from safe coal layers is much more uniform. The study of digital images of coal surfaces, taken with the help of an electron microscope, shows that the structural institution of surface elements may be presented by multifractal analysis, with its spectrum of fractal dimensions, which allows us to state quantitative distinctions in coal microstructures for outburst-dangerous layers. Coal from outburst-dangerous layers has a greater set of structural elements, and therefore a spectrum of fractal dimensions that is 1.5-2 times wider than for nonoutburst dangerous layers.
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Date submitted2009-10-05
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Date accepted2009-12-05
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Date published2010-09-22
Control of rock mass state in mining the sections at mines оf the Vorkutaugol JST: up-to-date practice
- Authors:
- O. V. Yamenko
- I. E. Plisko
The article briefly outlines the methods and measures used at mines of the Vorkutaugol JSC to control the stress strain state of rock massif. These measures help to increase face load and to ensure mine safety.
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Date submitted2009-07-05
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Date accepted2009-09-27
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Date published2010-04-22
The methods of strength definition for the rock mass properties applying to the open mining cut
- Authors:
- A. A. Pavlovich
The review of factors influencing rock mass strength is given. Methods of definition for sample strength changeover to rock mass are considered in the article.