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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">gscience</journal-id><journal-title-group><journal-title xml:lang="en">Mining Science and Technology (Russia)</journal-title><trans-title-group xml:lang="ru"><trans-title>Горные науки и технологии</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2500-0632</issn><publisher><publisher-name>The National University of Science and Technology MISiIS (NUST MISIS)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/2500-0632-2018-3-26-34</article-id><article-id custom-type="elpub" pub-id-type="custom">gscience-119</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MINING ROCK PROPERTIES. ROCK MECHANICS AND GEOPHYSICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>СВОЙСТВА ГОРНЫХ ПОРОД. ГЕОМЕХАНИКА И ГЕОФИЗИКА</subject></subj-group></article-categories><title-group><article-title>Analysis of fractal characteristics of mine working geometry for assessing quality of perimeter blasting</article-title><trans-title-group xml:lang="ru"><trans-title>Анализ фрактальных характеристик геометрии горных выработок для оценки качества контурного взрывания</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Латышев</surname><given-names>О. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Latyshev</surname><given-names>O. G.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Прищепа</surname><given-names>Д. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Prischepa</surname><given-names>D. V.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Уральский государственный горный университет (УГГУ)<country>Россия</country></aff><aff xml:lang="en">The Ural State Mining University (URSMU)<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>31</day><month>12</month><year>2018</year></pub-date><volume>0</volume><issue>3</issue><fpage>26</fpage><lpage>34</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Latyshev O.G., Prischepa D.V., 2018</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="ru">Латышев О.Г., Прищепа Д.В.</copyright-holder><copyright-holder xml:lang="en">Latyshev O.G., Prischepa D.V.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://mst.misis.ru/jour/article/view/119">https://mst.misis.ru/jour/article/view/119</self-uri><abstract><p>Methods of assessing quality of perimeter blasting when driving mine workings are considered. One of the main criteria is achieving “smooth” working contour. It is shown that a working contour line is a fractal object, geometry of which is adequately estimated by the fractional fractal dimensionality. Determining fractal dimensionality is based on Richardson’s law, connecting the length of an infinitely broken line with a measurement step. An algorithm for calculating the fractal dimensionality in computer software program is presented. Analysis of actual contours of underground workings produced using drilling and blasting operations allowed identifying statistically valid relationship between working surface roughness factor and the value of its fractal dimensionality. A criterion for assessing quality of perimeter blasting is proposed — fractal factor of a working shape. Its value is the ratio of the area of the working equivalent section to its squared perimeter, determined by fractal dimensionality of the contour line. The obtained relationships allow reliable assessing quality of perimeter blasting when driving mine workings.</p></abstract><trans-abstract xml:lang="ru"><p>Рассматриваются способы оценки качества контурного взрывания при проходке горных выработок. Одним из главных критериев является достижение «гладкого» контура выработки. Показано, что линия контура выработки представляет собой фрактальный объект, геометрия которого адекватно оценивается дробной фрактальной размерностью. Определение фрактальной размерности основано на законе Ричардсона, связывающего длину бесконечно изломанной линии с шагом измерения. Приводится алгоритм вычислений фрактальной размерности в компьютерной программе. Анализ реальных контуров подземных выработок, образующихся в процессе буровзрывных работ, позволил установить статистически надежную связь коэффициента шероховатости поверхности выработки с величиной ее фрактальной размерности. Предложен критерий качества контурного взрывания - фрактальный коэффициент формы горной выработки. Его величина представляет собой отношение площади эквивалентного сечения выработки к квадрату ее периметра, определяемого фрактальной размерностью контура. Полученные соотношения позволяют надежно оценивать качество контурного взрывания при проходке горных выработок.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>контурное взрывание</kwd><kwd>подземные выработки</kwd><kwd>фрактальная размерность</kwd><kwd>фрактальный коэффициент формы</kwd><kwd>коэффициент концентрации напряжений</kwd></kwd-group><kwd-group xml:lang="en"><kwd>perimeter blasting technique</kwd><kwd>underground workings</kwd><kwd>fractal dimensionality</kwd><kwd>fractal form factor</kwd><kwd>stress concentration factor</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Bieniawski Z.T. 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