gscienceMining Science and Technology (Russia)Горные науки и технологии2500-0632The National University of Science and Technology MISiIS (NUST MISIS)10.17073/2500-0632-2022-2-93-99gscience-345Research ArticleMINERAL RESOURCES EXPLOITATIONРАЗРАБОТКА МЕСТОРОЖДЕНИЙ ПОЛЕЗНЫХ ИСКОПАЕМЫХSubstantiation of pillar parameters in mining of inclined coal seams in Quang Ninh Province, VietnamОбоснование параметров целиков при отработке наклонных угольных пластов в условиях шахт провинции Куангнинь ВьетнамаНгуенВ. Н.NguyenV. N.

Вьет Нгиа Нгуен – преподаватель

Scopus ID 57204141788

г. Ханой

Viet Nghia Nguyen – Lecturer

Scopus ID 57204141788

Hanoi

nguyenvietnghia@gmail.comФамТ. Н.PhamT. N.

Ти Нхан Фам – преподаватель

Scopus ID 57369754200

г. Ханой

Thi Nhan Pham – Lecture

Scopus ID 57369754200

Hanoi

phamthinhan@humg.edu.vnhttps://orcid.org/0000-0003-1503-7650ОсинскийП.OsinskiP.

Петр Осинский – ассистент, Институт гражданского строительства

Scopus ID 55929586000

ResearcherID N-5911-2015

г. Варшава

Piotr Osinski – Assistant, Department of Geotechnical Engineering

Scopus ID 55929586000

ResearcherID N-5911-2015

Warsaw

НгуенТ. К.NguyenT. C.

Тхи Кук Нгуен – преподаватель

Scopus ID 57450931300

г. Ханой

Thi Cuc Nguyen – Lecturer

Scopus ID 57450931300

Hanoi

nguyenthicuc.nn@humg.edu.vnhttps://orcid.org/0000-0002-2403-063XЧиньЛ. Х.TrinhL. H.

Ле Хунг Чинь – преподаватель

Scopus ID 57035066200

г. Ханой

Le Hung Trinh – Lecturer

Scopus ID 57035066200

Hanoi

trinhlehung@lqdtu.edu.vnХанойский горно-геологический университетВьетнамHanoi University of Mining and GeologyViet NamВаршавский университет естественных наукПольшаWarsaw University of Life SciencePolandТехнический университет им. Ле Куи ДонВьетнамLe Quy Don Technical UniversityViet Nam202220072022729399Copyright © Nguyen V.N., Pham T.N., Osinski P., Nguyen T.C., Trinh L.H., 20222022Нгуен В.Н., Фам Т.Н., Осинский П., Нгуен Т.К., Чинь Л.Х.Nguyen V.N., Pham T.N., Osinski P., Nguyen T.C., Trinh L.H.This work is licensed under a Creative Commons Attribution 4.0 License.https://mst.misis.ru/jour/article/view/345

Design and operation of auxiliary underground workings in coal mines involves substantiation of parameters of coal pillars and requires development of new approaches to substantiate their geometrics. On the one hand, sufficient stability of a “rock mass – working – coal pillar” system should be ensured. On the other hand, the parameters of “frozen” coal reserves in the pillars should be justified. The joint solution of these two problems requires accurate forecasting based on modern digital models of a rock mass. In this study, a model of rock mass and mine workings with different dimensions of a coal pillar is presented with the use of Flac3D software. The simulation findings showed that when developing sloping coal seams, the volume of coal extraction in a longwall has an effect on the stress-strain state of the enclosing rock mass. During the study different factors having effect on geometrics of a coal pillar were analyzed, and their influence on the field of stresses and shear of inclined layers in a rock mass was studied, and the size of the plastic deformation zone around an auxiliary mine working was also determined. The study findings are also of practical importance in terms of substantiating the parameters of a working support design. The size of coal pillar is also connected with the support type. It should be taken into account that bolts should be of sufficient length to ensure firm fixing and located in the zone of intact rocks. The research showed that a coal pillar should be 10 to 15 m wide in order to ensure optimal mining conditions and safety.

Проектирование и эксплуатация вспомогательных подземных выработок при разработке угольных месторождений предполагают обоснование параметров целиков угля и требуют разработки новых подходов для обоснования их геометрических параметров. С одной стороны, необходимо обеспечить достаточную устойчивость системы «массив горных пород – выработка – угольный целик», с другой – обосновать параметры «замороженных» в целиках запасов угля. Совместное решение этих двух задач требует точного прогнозирования на основе современных цифровых моделей массива горных пород. В настоящем исследовании авторы публикации, используя программное обеспечение Flac3D, представили модель массива горных пород и выработок с различными размерами угольного целика. Результаты моделирования показали, что в условиях наклонного залегания угольных пластов и массива горных пород объём добычи угля в забое влияет на напряженно-деформированное состояние массива горных пород. В ходе исследования были проанализированы различные факторы, влияющие на геометрические параметры угольного целика, изучено их влияние на поле напряжений и смещений горных пород, происходящих в условиях их наклонного залегания в массиве, а также определена величина зоны пластической деформации вокруг вспомогательной выработки. Результаты исследования имеют практическое значение и в части обоснования параметров конструкции крепи выработки. Размер угольного целика также связан с типом крепи выработки. Следует учитывать, что анкер должен иметь достаточную для прочного крепления длину и располагаться в зоне ненарушенных горных пород. Исследования показали, что для обеспечения оптимальных условий ведения горных работ и безопасности ширина угольного целика должна составлять от 10 до 15 м.

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The authors declare that there are no conflicts of interest present.