Purpose is to identify the basic joint systems, their characteristics, distribution within the rock mass, and determine impact of the joints on the bench stability. Methods. The risks of strain emergence in the form of blocks sliding along weakness surfaces within the local areas were determined based upon the definition of rock stability loss. The results of large-scale measurements of jointing were processed using circular and bar diagrams as well as stereographic grids. In the context of the paper, kinematic analysis was implemented through Dips Rocscience Inc. Software. Findings. Five basic joint systems have been identified; joints of 2nd and 5th systems are the most commonly encountered among them. The results of the jointing determination within the open pit boundaries have been represented as well as the open pit wall stability in terms of each site inclusive of consideration of potential strains along the sliding surface. Originality. For the first time, zoning of the open pit wall in terms of slide types has been performed. It has been identified that potential shear of a prismatic block is 33%; at the same time, 66% are bench destruction with the block toppling. The risk of wedge-shaped block shear is minimal. Practical implications. The research findings may be helpful to define and select both parameters and conditions of safe mineral extraction under the specific mining and geological conditions. In turn, the abovementioned will help reduce the risk of accidence while providing scientifically substantiated approach to select quarrying sequence, techniques, and system.

Purpose. Determining a relationship between the shear/failure of the rock mass and the technogenic earthquakes caused by them during underground mining of ore deposits with the derivation of an equation for the dependence of the technogenic earthquake indicators for the conditions of the Zhezkazgan copper-ore field. Methods. The research methodology consists of studying and analyzing early research on technogenic earthquakes by the method of statistical data processing. Calculation of rock mass deformation distribution in the study area is based on numerical modeling in the Comsol Multiphysics 5.6 and MATLAB 2020 software package environment. Calculations are performed based on solving a plane problem using the Finite Element Method (FEM). Findings. Based on the transition from the failure area to subsidence and shear values of the overlying rock mass stratum, an equation for the dependence of the earthquake magnitude on the numerical values of the mass subsidence or shear has been obtained. Originality. For the first time, based on the physics and geomechanics of rock mass shear processes, empirical-analytical formulas have been obtained that make it possible to predict the technogenic earthquake magnitude during underground mining of ore deposits in the conditions of the Zhezkazgan copper-ore field. Practical implications. Preliminary predictive calculations made by the obtained formulas for the conditions of the active mine No. 31 of the East-Zhezkazgan mine, ТОО Kazakhmys Smelting, show acceptable results of magnitude value, comparable to in-situ measurements during field mining. This prediction makes it possible to pre-calculate the technogenic earthquake magnitude at the stage of designing mining operations and make appropriate scientifically sound decisions during further mining of the field.

In recent years all over the world special attention has been paid to the development and implementation of nanostructured materials possessing unique properties and opening fascinating prospects for the development of technical progress in various fields of human activities. A special place can be given to the development of service robots, the market of which is actively developing. There is problem associated mainly with the lack of heat-strengthened alloys which consists in low thermal stability of the alloy properties under the conditions of elevated variable temperatures and loads. The article presents studies to assess the effect of composition, the amounts of refractory nanoscale particles and methods for their introduction into the melt on the structure and properties in nanostructured composite aluminum alloys. The powders of metals, alloys, as well as silicon carbide and aluminum oxide were used to produce the nanostructured powder composite materials. As a result of the research, NPCM compositions containing micro-size particles of transition metals that are carriers of nanosized reinforcing particles and initiators of the formation of an intermetallide of endogenous origin in a melt.

Көмір тақталарының метаны бірнеше онжылдықтар бойы бүкіл әлемде баламалы энергия көзі ретінде пайдаланылуда. Көмірдің метаны әр түрлі салаларда шикізат ретінде кеңінен қолданылады. Өйткені ол табиғи газ. Көмірдің метанын пайдаланудың схемалары бойынша қамсыздандырылатын газдың көлемі мен құрамына белгілі талаптар бар. Бұл факторлар сатудың көлемі мен кірісіне айтарлықтай әсер етеді. Көмірдің метанын қолдану бойынша тиімді жобасының сауда-саттық негізгі критерийлері болып ұзақ мерзімді газ көзі және сенімді тұтынушы саналады. Метанды қолдану әдісін таңдау кезінде негізгі фактор болып өндіру көлемі мен өндірістің пайдалылығы арасындағы теңестік саналады. Әлемдік тәжірибе көмір тақталарының метанын энергетикалық бағытта шикізат ретінде жылу мен электр энергиясын өндіру үшін, сондай-ақ, химия өнеркәсібінде пайдаланудың мүмкіндігін көрсетеді. Көмірдің метанын басқа бағытта қолдану бойынша инвестициялық шешімдер қабылдаған кезде толық және мұқият талдау жүргізу қажет. In the global context, coal-bed methane has been used as an alternative energy source for several decades. Coal methane is widely used as a raw material in various industries, as it is a natural gas. Most schemes of using coal methane have certain requirements for the volume and composition of the supplied gas. These factors have a significant impact on sales volumes and profits. The main criteria for a commercially viable CBM project are a long-term source of gas and a reliable consumer. The main factor in selecting the method of using methane is the balance between the volume of production and profitability of production. The world practice shows the possibility of using coal-bed methane as a raw material both in the energy sector for generating heat and electricity, and in the chemical industry. When making investment decisions on the use of coal methane in one or another aspect, a complete and thorough analysis is needed. В мировых масштабах метан угольных пластов уже несколько десятков лет применяется в качестве альтернативного источника энергии. Углеметан широко используется в качестве сырья в различных отраслях промышленности, так как представляет собой природный газ. Большинство схем использования углеметана имеют определенные требования к обьемам и составу поставляемого газа. Эти факторы значительно влияют на объемы продаж и прибыль. Основными критериями коммерчески выгодного проекта по использованию углеметана являются наличие долгосрочного источника газа и надежного потребителя. Основным фактором при выборе метода использования метана является баланс между объемом добычи и рентабельностью производства. Мировая практика показывает возможность использования метана угольных пластов в качестве сырья как в энергетическом направлении для получения тепло- и электроэнергии, так и в химической индустрии. При принятии инвестиционных решений по применению углеметана в том или ином направлении необходимо проведение полного и тщательного анализа.

A method is presented for studying the influence of disjunctive geological faults on the formation of conditions that lead to gas-dynamic phenomena (GDP) during the ex-traction of outburst-prone coal seams. The methodology is based on numerical model-ing of the stress–strain state of the rock mass using the finite element method (FEM) to determine the magnitudes of principal stresses in the zone between the excavation and the fault. Based on the adopted coal–rock strength theory, areas of disturbed rock in-tegrity are identified, which are considered potentially hazardous in terms of sudden coal and gas outbursts. The results of modeling a real gas-dynamic event that occurred in an operating mine confirmed the applicability of the proposed approach for pre-dicting outburst-prone zones during excavations within disjunctive tectonic faults. The scientific novelty of this research lies in identifying the specific features of stress-field formation resulting from the interaction between natural geological faults and tech-nological disturbances induced by mining operations. On this basis, a method has been developed to detect potential zones of gas-dynamic manifestations. After validation under mine conditions, the proposed method can be recommended for practical im-plementation in the design and planning of mining operations to forecast and prevent GDP.