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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">10.17073/2500-0632-2018-2-51-57</article-id><article-id custom-type="elpub" pub-id-type="custom">gscience-111</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>Estimation of near-wall rock mass stability when extracting exposed coal seam</article-title><trans-title-group xml:lang="ru"><trans-title>Оценка устойчивости прибортового массива при отработке выходов угольного пласта</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>Бесимбаева</surname><given-names>О. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Bessimbaeva</surname><given-names>Olga G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Караганда</p></bio><bio xml:lang="en"><p>56, Mira blvd, Karaganda city, The Republic of Kazakhstan, 100027</p><p>Cand. Sci. (Tech.)</p></bio><email xlink:type="simple">bog250456@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Хмырова</surname><given-names>Е. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Khmyrova</surname><given-names>Elena N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Караганда</p></bio><bio xml:lang="en"><p>56, Mira blvd, Karaganda city, The Republic of Kazakhstan, 100027</p><p>Cand. Sci. (Tech.)</p></bio><email xlink:type="simple">hmyrovae@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Низаметдинов</surname><given-names>Ф. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Nizametdinov</surname><given-names>Farit K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Караганда</p></bio><bio xml:lang="en"><p>56, Mira blvd, Karaganda city, The Republic of Kazakhstan, 100027</p><p>Dr. Sci. (Tech.) (7212) 56-26-27</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Олейникова</surname><given-names>Е. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Oleinikova</surname><given-names>Elena A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Караганда</p></bio><bio xml:lang="en"><p>56, Mira blvd, Karaganda city, The Republic of Kazakhstan, 100027</p><p>(7212) 56-26-27</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Карагандинский государственный технический университет<country>Казахстан</country></aff><aff xml:lang="en">Karaganda State Technical University<country>Kazakhstan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2018</year></pub-date><pub-date pub-type="epub"><day>12</day><month>08</month><year>2018</year></pub-date><volume>0</volume><issue>2</issue><fpage>51</fpage><lpage>59</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Bessimbaeva O.G., Khmyrova E.N., Nizametdinov F.K., Oleinikova E.A., 2018</copyright-statement><copyright-year>2018</copyright-year><copyright-holder xml:lang="ru">Бесимбаева О.Г., Хмырова Е.Н., Низаметдинов Ф.К., Олейникова Е.А.</copyright-holder><copyright-holder xml:lang="en">Bessimbaeva O.G., Khmyrova E.N., Nizametdinov F.K., Oleinikova E.A.</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/111">https://mst.misis.ru/jour/article/view/111</self-uri><abstract><p>The paper considers assessing stability of the open pit southern wall when extracting exposed coal seam D6. To assess the open pit southern wall stability when extracting exposed coal seams, modern research methods were used: the study of geology and analysis of the near-wall rock mass condition, creation of an observation station and monitoring, estimation of the southern near-wall rock mass stability, and analysis of the study findings. The pit southern wall is composed of clayey sediments up to 5 m thick, underlain by siltstone and mudstone up to 10-20 m thick, and a coal seam up to 5 m thick. Substantiation of the estimated strength characteristics of the rocks composing the open pit bench slopes, which determine the stress state of the slopes, arising under the effect of internal and external forces, has been performed. Instrumental observations produced by the station and the survey of fractures on the open pit wall enabled determining contours of the deformation zone and dimensions of the landslide prism. A geotechnical model of the near-wall rock mass was created, and stability assessment within the geological section along the line of maximum development depth was carried out. After implementing measures on surcharging slopes of the southern wall, the factor of safety amounts to: nу =1.69−1.73 that indicates termination of the active phase of the wall deformation and confirms the wall stability.</p></abstract><trans-abstract xml:lang="ru"><p>Рассматриваются вопросы оценки устойчивости южного борта карьера при отработке выхода угольного пласта Д6. Для оценки устойчивости южного борта карьера при отработке выходов угольных пластов применены современные методы исследований: изучение геологического строения и анализ состояния прибортового массива, создание наблюдательной станции и производство наблюдений, выполнение расчетов устойчивости прибортового массива южного борта карьера и анализ результатов выполненных исследований. Южный борт карьера сложен глинистыми отложениями мощностью до 5 м, далее алевролитами и аргиллитами мощностью до 10–20 м и угольным пластом мощностью до 5 м. Выполнено обоснование расчетных прочностных характеристик горных пород, слагающих откосы уступов карьера, которые определяют напряженное состояние откосов, возникающих под воздействием внутренних и внешних сил. Инструментальные наблюдения по заложенной станции и съемка трещин на борту карьера позволили определить контуры зоны деформации и размеры оползневой призмы. Создана геомеханическая модель прибортового массива карьера и проведена оценка устойчивости по геологическому разрезу по линии максимальной глубины разработки. После выполненных мероприятий по пригрузке откосов южного борта карьера коэффициент запаса устойчивости составляет nу =1,69–173, что говорит о прекращении активной фазы деформирования борта и устойчивом его состоянии.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>участок открытой отработки</kwd><kwd>геологическое строение</kwd><kwd>оценка устойчивости борта карьера</kwd><kwd>деформационные процессы</kwd><kwd>коэффициент запаса устойчивости</kwd><kwd>скальная пригрузка.</kwd></kwd-group><kwd-group xml:lang="en"><kwd>open-pit mining area</kwd><kwd>geological setting</kwd><kwd>assessment of pit slope stability</kwd><kwd>deformation processes</kwd><kwd>factor of safety</kwd><kwd>rock surcharge.</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">Методические указания по определению углов наклона бортов, откосов уступов и отвалов строящихся и эксплуатируемых карьеров. 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