2411-3336 2541-9404 Записки Горного института Journal of Mining Institute Санкт-Петербургский горный университет императрицы Екатерины ΙΙ Empress Catherine II Saint Petersburg Mining University GPKEBJ pmi-16186 https://pmi.spmi.ru/pmi/article/view/16186 Геотехнология и инженерная геология Geotechnical Engineering and Engineering Geology Predictive assessment of ore dilution in mining thin steeply dipping deposits by a system of sublevel drifts Прогнозная оценка разубоживания руды при отработке маломощных крутопадающих залежей системой подэтажных штреков Imashev Askar Zh. Имашев А. Ж. Imashev Askar Zh. a.imashev@kstu.kz 0000-0002-9799-8115 Карагандинский технический университет имени Абылкаса Сагинова (Караганда, Казахстан) Abylkas Saginov Karaganda Technical University (Kazakhstan, Kazakhstan) Suimbaeva Aigerim M. Суимбаева А. М. Suimbaeva Aigerim M. suimbayeva.aigerim@mail.ru 0000-0001-6582-9977 Карагандинский технический университет имени Абылкаса Сагинова (Казахстан, Казахстан) Abylkas Saginov Karaganda Technical University (Kazakhstan, Kazakhstan) Musin Aibek A. Мусин А. А. Musin Aibek A. musin_aibek@mail.ru 0000-0001-6318-9056 Карагандинский технический университет имени Абылкаса Сагинова (Караганда, Казахстан) Abylkas Saginov Karaganda Technical University (Karaganda, Kazakhstan) 22 02 2024 2024 266 283 294 14 03 2023 25 10 2023 25 04 2024 © 2024 А. Ж. Имашев, А. М. Суимбаева, А. А. Мусин © 2024 Askar Zh. Imashev, Aigerim M. Suimbaeva, Aibek A. Musin 2024 А. Ж. Имашев, А. М. Суимбаева, А. А. Мусин Askar Zh. Imashev, Aigerim M. Suimbaeva, Aibek A. Musin Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0) This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0) https://pmi.spmi.ru/pmi/article/view/16186

Цель исследования – изучение напряженно-деформированного состояния приконтурного массива горных пород вокруг очистного блока и прогнозная оценка разубоживания руды с учетом изменения мощности рудного тела при отработке маломощных рудных залежей на примере рудника Жолымбет. Изучение особенностей формирования напряженно-деформированного состояния проводилось по методике, основанной на использовании численных методов исследований с учетом геологического индекса прочности (GSI), который позволяет учитывать структурные особенности горных пород, трещиноватость, литологию, обводненность и другие прочностные показатели, за счет чего происходит корректный переход от прочности образца горных пород к прочности массива. Результаты численного анализа напряженно-деформированного состояния приконтурной части массива горных пород методом конечных элементов по критерию прочности Hoek – Brown позволили оценить геомеханическое состояние в приконтурном массиве при условии изменения мощности рудного тела и прогнозировать объем разубоживания руды. Установлено, что при отработке рудных залежей малой мощности на прогнозное значение разубоживания руды оказывают влияние мощность рудного тела и GSI. Получена зависимость изменения значений разубоживания руды от GSI с учетом изменения мощности рудного тела от 1 до 3 м. Анализ результатов исследования показал, что прогнозные размеры зоны разрушения пород вокруг очистных блоков имеют достаточно большие значения, за счет чего не достигаются показатели планового разубоживания руды. Возникает необходимость снижения сейсмического воздействия силы взрыва на законтурный массив горных пород и обновления паспорта буровзрывных работ.

The purpose of research is the study of stress-strain state of marginal rock mass around the stope and predictive assessment of ore dilution with regard for changes in ore body thickness in mining thin ore deposits on the example of the Zholymbet mine. Study of the specific features of the stress-strain state development was accomplished applying the methodology based on numerical research methods taking into account the geological strength index (GSI) which allows considering the structural features of rocks, fracturing, lithology, water content and other strength indicators, due to which there is a correct transition from the rock sample strength to the rock mass strength. The results of numerical analysis of the stress-strain state of the marginal part of the rock mass using the finite element method after the Hoek – Brown strength criterion made it possible to assess the geomechanical state in the marginal mass provided there are changes in ore body thickness and to predict the volume of ore dilution. It was ascertained that when mining thin ore deposits, the predicted value of ore dilution is influenced by the ore body thickness and the GSI. The dependence of changes in ore dilution values on the GSI was recorded taking into account changes in ore body thickness from 1 to 3 m. Analysis of the research results showed that the predicted dimensions of rock failure zone around the stopes are quite large, due to which the indicators of the estimated ore dilution are not attained. There is a need to reduce the seismic impact of the blasting force on the marginal rock mass and update the blasting chart.

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