11 research outputs found
Analysis of the stress deformed state of rocks around the haulage roadway of the Beskempir field (Kazakhstan)
No full textPurpose. To perform research and detailed analysis of the stress deformed state of rocks around the haulage roadway based on the numerical modeling with the purpose to select the rational type and design of the haulage roadway support at the Beskempir field.
Methods. A comprehensive research method has been used: review and generalization of references related to the study of the stress deformed state of a rock mass, improvement of the walling technology, in-situ and laboratory tests in the research and testing of rock samples strength; application of mathematical statistics and processing of experimental data using software products. The numerical modeling of the stress deformed state was done using the Examine 2D application with due account for the shape of broken rocks area, which is a 138х138х138 m regular triangle. Barton’s Q-system was used to the RQD assessment.
Findings. The numerical modeling of the stress deformed state of rocks in the tectonic fault zone of the haulage roadway at +230 m was performed, and the rock mass deformation zones were defined around the mine contours. The charts showing displacement of roof rocks and walls of the haulage roadway were built, where it was established that the maximum displacement was manifest over the tectonic fault zone. The following zones were identified: the rock mass instability zones, the rock mass instability zones with due account for its fracturing, the zones of stable and unstable rock masses of the haulage roadway. It was established that 41.6% of the working with the fault zone is unstable, and 58% of it is a more stable part. It is proposed to divide the haulage roadway into three sections depending on the rock stability with a certain type of support.
Originality. Based on the study of the stress deformed state of the rock mass in the conditions of the Beskempir field, site-specific unstable sections were identified. They ensured the selection of the support design with adjustable resistance.
Practical implications. The application of support with adjustable resistance depending on the rock mass stability ensures minimization of costs for roadway support, maintenance of extensive sections of the working as well as enhanced mining safety in specific mining and geological conditions of the Beskempir field.Мета. Дослідження та детальний аналіз напружено-деформованого стану (НДС) гірських порід навколо транспортного штреку на основі чисельного моделювання для вибору раціонального типу і конструкції кріплення транспортного штреку родовища “Беспемпір”.
Методика. Використано комплексний метод дослідження: аналіз і узагальнення літературних джерел з вивчення НДС гірських порід масиву, вдосконалення технології кріплення гірничих виробок; натурних і лабораторних випробувань при дослідженні та визначенні міцності зразків гірських порід; застосування математичної статистики та обробки експериментальних даних у програмних продуктах. Чисельне моделювання НДС виконано в програмі Examine 2D з урахуванням утвореної області зруйнованих порід у вигляді правильного трикутника зі сторонами 138×138×138 м. Для оцінки стійкості порід використовували методику Бартона (Q-рейтинг).
Результати. Виконано чисельне моделювання НДС гірських порід в зоні тектонічного розлому транспортного штреку на горизонті +230 м і визначено зони поширення деформацій масиву навколо контуру виробки. Побудовано графіки зміщення порід покрівлі та боків транспортного штреку й встановлено, що максимальні зміщення проявляються протягом зони тектонічного розлому. Виявлено зони нестійкості масиву, зони нестійкості масиву з урахуванням тріщинуватості масиву виробки, зони поширення стійких і нестійких масивів транспортного штреку. Встановлено, що виробка з урахуванням розлому має протяжність нестійкої частини масиву 41.6%, а більш стійка частина виробки – 58%. Запропоновано протяжність транспортного штреку розділити на 3 ділянки за стійкістю гірських порід з певним видом кріплення.
Наукова новизна. Для умов родовища “Бескемпір” у транспортному штреку на основі вивчення НДС масиву гірських порід виявлено характерні ділянки за стійкістю, що дозволило визначити конкретну конструкцію кріплення регульованого опору (КРО).
Практична значимість. Застосування КРО залежно від стійкості масиву гірських порід, дозволяє мінімізувати витрати на кріплення штреку і підтримання протяжних ділянок виробки, а також підвищити безпеку ведення гірничих робіт у конкретних гірничо-геологічних умовах Бескемпірського родовища.Цель. Исследование и детальный анализ напряженно-деформированного состояния (НДС) горных пород вокруг транспортного штрека на основе численного моделирования для выбора рационального типа и конструкции крепи транспортного штрека месторождения “Бескемпир”.
Методика. Использован комплексный метод исследования: анализ и обобщение литературных источников по изучению НДС горных пород массива, совершенствованию технологии крепления горных выработок; натурных и лабораторных испытаний при исследовании и определении прочности образцов горных пород; применению математической статистики и обработки экспериментальных данных в программных продуктах. Численное моделирование НДС выполнено в программе Examine 2D с учетом образованной области разрушенных пород в виде правильного треугольника со сторонами 138×138×138 м. Для оценки устойчивости пород использовали методику Бартона (Q-рейтинг).
Результаты. Выполнено численное моделирование НДС состояния горных пород в зоне тектонического разлома транспортного штрека на горизонте +230 м и определены зоны распространения деформаций массива вокруг контура выработки. Построены графики смещение пород кровли и боков транспортного штрека и установлено, что максимальные смещение проявляются на протяжении зоны тектонического разлома. Выявлены зоны неустойчивости массива, зоны неустойчивости массива с учетом трещиноватости массива выработки, зоны распространения устойчивых и неустойчивых массивов транспортного штрека. Установлено, что выработка с учетом разлома имеет протяженность неустойчивой части массива 41.6%, а более устойчивой части выработки – 58%. Предложено протяженность транспортного штрека разделить на 3 участка по устойчивости горных пород с определенным видом крепления.
Научная новизна. Для условий месторождения “Бескемпир” в транспортном штреке на основе изучения НДС массива горных пород выявлены характерные участки по устойчивости, что позволило определить конкретную конструкцию крепи регулируемого сопротивления (КРС).
Практическая значимость. Применение КРС в зависимости от устойчивости массива горных пород позволяет минимизировать затраты на крепление штрека и поддержание протяженных участков выработки, а также повысить безопасность ведения горных работ в конкретных горно-геологических условиях Бескемпирского месторождения.The results of these studies were obtained partially thanks to the support of Joint-Stock Company “AK Altynalmas”
Correction: Sarsekova D, Ayan S, Talgat A, 2020. Ectomycorrhizal Flora Formed by Main Forest Trees in the Irtysh River Region of Central and Northeastern Kazakhstan
No full textThe authors wish to make the correction of the paper of Sarsekova et al. (2020). In the original paper, there was a mistake in the order of the first and the second name of the author Talghat Abbzhabnov. The correct order is Talghat Abbzhabnov. The original paper published on 11 May 2020 has been updated and both versions will be available on the paper webpage. The authors emphasize that this change does not affect the results of this research, and they apologize for any inconvenience this change may cause
A Novel Approach to Selecting Rational Supports for Underground Mining Workings
No full textThe goal of this study is to examine the stress-strain state and stability of rock massifs to select a rational type of support for underground workings in challenging mining and geological conditions. The primary aims include increasing the speed of mine workings, reducing capital expenditure, and enhancing safety. Established and novel theoretical methods for mining, geomechanics, and rock massif management were employed. These methods involve analyzing factors affecting the mine working speed, studying the physical and mechanical properties of rocks, developing stratigraphic profiles, and assessing the stress-strain state and stability using Bieniawski's Rock Mass Rating (RMR), Barton's Q-rating, and construction norms and rules. Numerical modeling with the Rocscience RS2/RS3 software was utilized to identify failure-prone areas and determine rational support types and parameters. This study provides comprehensive insights into the stress-strain state of the massif, identifying high-risk zones, and recommending suitable support types. The findings contribute to accelerating the progress of underground work, enhancing safety, and reducing construction costs. The developed support systems for challenging mining and geological conditions were designed to increase the speed, safety, and profitability of underground workings. Additionally, this research emphasizes the significance of selecting appropriate support systems to ensure the longevity and stability of underground structures, thereby optimizing operational efficiency and cost-effectiveness. Doi: 10.28991/CEJ-2025-011-03-022 Full Text: PD
Optimization of Drilling and Blasting Parameters During the Drifting of Underground Mine Workings
No full textThe study aims to scientifically substantiate optimal drilling-and-blasting (D&B) parameters for driving underground mine workings under complex geological and mining conditions at the Akzhal deposit. The work addresses the selection of explosive types and the rational depth, configuration, and design of cut boreholes, together with their blasting pattern (BP), to improve rock-mass stability, operational safety, and advance efficiency. The methodology combines an assessment of geological-technical conditions with a review of current blasting practice, mathematical and numerical modelling of blast-induced face breakage, and pilot-scale industrial trials supported by statistical analysis and techno-economic evaluation under routine production constraints and reporting. The results show that optimization of the BP increases the borehole utilization factor (BUF) from η = 0.85 to η = 0.98. The locally produced Granulite A6 is proven effective, reducing blasting costs by 1.5 times relative to AS-8 while preserving the required energy characteristics. Charge optimization improves excavation-contour quality, enhances fragmentation uniformity, and reduces overbreak; the most rational solution is a rhombic cut combined with Granulite A6. Scientific novelty lies in integrating geological-geomechanical analysis, 3D modelling in Micromine, and industrial validation. Practical relevance is confirmed by decreasing cycle costs from USD 538.85 to USD 489.38, improving BUF, and enhancing contour quality
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No full textThis article considers the staging of documents and national identity in Talgat Batalov’s 2012 theatre production Uzbek, an autobiographical solo show that recounts Batalov’s experience emigrating from Tashkent to Moscow at the age of nineteen. Through its close reading of Uzbek in performance, this study illustrates how the author uses irony and humor to both embody and elucidate the sociospatial discourse that posits Russia as the “modern center” to Central Asia’s “pre-modern periphery.” Additionally, this article explores how by presenting his audiences with his actual immigration records, and undermining their credibility, Batalov activates the unreliable status of documents in contemporary Russian culture
The Impact of Corruption on the Institutions of Political Power in the Republic of Kazakhstan: The Cratological Context and Law Enforcement Activities
No full textSince the Republic of Kazakhstan gained its sovereignty in the law enforcement system, a number of large-scale reforms have been carried out, state programs have been approved and implemented, a full-scale recertification of employees of all law enforcement agencies, and a regulatory base have been updated through the adoption of special laws on law enforcement and internal affairs bodies. However, despite all the above circumstances, the level of corruption in the internal affairs bodies is still high.
Obviously, there is a whole complex of latent reasons for this situation and the author denotes the contours of their scientific research. The most difficult direction, which the author singled out, should be recognized as a change in approaches to the formation of a strategy for combating corruption. This article suggests a preliminary analytical description of the impact of corruption on political institutions in terms of cratology and the most significant aspects of regulation.</jats:p
Innovative Compositions of Shotcrete Mixtures for Reinforcement of Underground Mine Excavations
No full textThe objective of this article is to develop a polymer-modified shotcrete composition to improve underground mine support. The authors propose a new formulation by integrating an aqueous emulsion of SKS-65 GP grade B latex into cementitious matrices. Methods include X-ray diffraction, particle-size analysis, rheological testing, mechanical strength tests, numerical modeling, in-situ trials at the Zholbarysty mine, and statistical evaluation. Findings show a 45% increase in compressive strength and a 30% reduction in rebound loss compared to standard mixtures. Field core samples confirmed reproducibility, with strength values within 1% of those from laboratory-tested cubes. The improved mix allows a 50% reduction in lining thickness, expanding the tunnel cross-section by 5% and lowering operational costs by 39%. Cost-benefit analysis and cross-sectional evaluation validate the approach's efficiency. The novelty of this work lies in combining microstructural insights with field-scale application, clarifying polymer-film formation mechanisms, and presenting an optimized, scalable shotcrete mix design. This integrated method provides a practical and cost-effective reinforcement solution, advancing current shotcrete technologies for underground operations
GPR-Driven Geomechanical Modeling and Drill-Blast Optimization for Enhanced Efficiency in Open-Pit Gold Mining
No full textThis study seeks to raise the operational efficiency and economic return of the Vasilkovskoye open-pit gold mine by integrating real-time ground-penetrating-radar (GPR) monitoring, geomechanical modeling, and digital optimization of drilling-and-blasting parameters. Continuous GPR scanning identified hazardous fracture zones that were subsequently characterized in DIPS and RS2 to model slope stability, while ShotPlus-based blast simulations and OrePro 3D displacement modeling guided the redesign of hole spacing, charge distribution, and delay timing. Fragmentation quality was verified with high-resolution photogrammetry and correlated to blast design through statistical analysis; a comparative techno-economic assessment quantified cost and dilution differentials between conventional and optimized schemes. The integrated workflow established a robust predictive link between blast geometry and fragment size, reducing oversize generation by 17% and ore dilution by 9%, while increasing gold grade in mill feed from 0.84 g t⁻¹ to 0.94 g t⁻¹. GPR-informed hazard mapping eliminated unplanned wall failures, and the revised pattern lowered specific explosive consumption without compromising fragmentation, cutting total unit costs by 8%. Unlike previous studies that treat slope stability and blasting as separate tasks, this study couples deformation dynamics with blast design in a single digital loop, offering a transferable framework for automation-ready, risk-aware mine planning at complex geological sites
Student's Performance Evaluation by Fuzzy Logic
No full textAbstractIn connection with the spread of ICT in education there is an acute issue about getting a qualitative education. Therefore, various methods of determining the quality of education are developed and applied. In this paper, we propose a fuzzy model of performance evaluation of students through the establishment of performance. And we will try to prove the advantages of the use of fuzzy logic in the evaluation of students’ knowledge
