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Journal of Mining Sciences

2015 year, number 5

1.
Technological Aspects of Transition to High Bench Stripping in Kuzbass

V. A. KOVALEV, V. S. FEDOTENKO
Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
Keywords: горнотехнические системы, открытые горные работы, высокий уступ, главные параметры карьера, технологические схемы, реконструкция разреза, mining systems, open pit mining, high bench, principal open pit parameters, flow charts, open pit mine modernization

Abstract >>
The article presents argumentation in favor of transition to high bench stripping in open pit mines in Kuzbass, which will increase coal production and improve mine performance. The authors find functional connection between the duration of the transition to high bench stripping and the increase in the finite depth of an open pit mine. Substantiation is given to choosing the height of a bench based on the change in relationship of operating costs and a cut layer height. The practical significant of the research is development of a new approach to validating expediency of high benches for mining with truck&shovel and creation of a procedure to find increment in ultimate pit contour in transition to stripping with high benches.
																								



2.
Analysis of Ventilation of Working Areas in Thick Gently Dipping Coal Seams

V. O. TORRO, V. P. TATSIENKO, A. V. REMEZOV
Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
Keywords: системы разработки, межслоевая пачка, концентрированные потери угля, схема проветривания, способ проветривания, аэродинамика выработанных пространств, утечки воздуха, очаг самонагревания, эндогенный пожар, mining methods, interlayer unit, accumulated coal loss, ventilation scheme, ventilation method, mined-out area aerodynamics, air leaks, spontaneous heating sources, endogenous fire

Abstract >>
Advanced technologies and modern high-production machines for underground mining of thick gently dipping coal demand strict adherence to technological discipline, reduction in operational loss and selection of optimized ventilation modes. The authors analyze ventilation schemes used in working areas in thick gently dipping seams in order to reveal influence exerted by the schemes, methods and parameters of ventilation on distribution of air loss in mined-out areas.
																								



3.
Technological Significance of Internal Dumping in Open Pit Coal Mining in Kemerovo Region

A. V. SELYUKOV
Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
Keywords: методические позиции, открытые горные работы, внутреннее отвалообразование, структурные схемы добычи, карьерное поле, угольные разрезы, methodical attitudes, open pit mining, internal dumping, structural mining scheme, open pit field, open pit coal mines

Abstract >>
The article reports research findings in the area of open pit coal mining and substantiates alternative technologies based on new technological and organizational principles of open pit mining. Using the method of geometrical analysis of an open pit mine field and technological design of mining systems, stage-wise mining technologies have been developed for the case when mining front advance is changed. Such technologies ensure the improvement of a wide range of technical-and-economical and ecological performance of an open pit mine. The main flow charts of the mining sequences are interconnected with natural-technological groups of deposits, that influence cross-wise configuration of an open pit (ultimate contour) and structural characteristics (parameters) of working areas and generate geometrical type of an open pit field.
																								



4.
Justification of Low-Output Equipment Systems for Open Pit Coal Mining, Considering Efficiency of Use of Land Resources

E. V. KUREKHIN
Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
Keywords: малые разрезы, способы размещения вскрышных пород, карьерная выемка, землеемкость, угольные месторождения с ограниченными запасами, технологическая классификация комплексов оборудования, small open pits, dumping methods, open pit mining, land size, limited coal reserves, technological classification, equipment systems

Abstract >>
Under discussion is the equipment for open pit mining of limited coal reserves. Methods of overburden dumping are systematized. A new dumping method is offered; it allows reducing land withdrawal by means of utilizing adjacent open pit. The author presents relations for area of internal dumping, considering coefficient of dumping in the adjacent open pit and the volume of the adjacent open pit. The feasibility of overburden placement in mined-out pits is analyzed.
																								



5.
Fuel Briquetting Using Finely Disperse Waste of Coal Mining and Processing

A. V. PAPIN, A. YU. IGNATOVA, A. V. NEVEDROV, T. G. CHERKASOVA
Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
Keywords: отходы угледобычи и углепереработки, брикетирование, топливные брикеты, угольная пыль, коксовая пыль, обогащение, масляная агломерация, фусы коксования, coal mining and processing waste, briquetting, fuel briquettes, coal dust, coke dust, dressing, oil agglomeration, heavy coal-tar

Abstract >>
In focus is fuel briquetting using coal mining and processing waste. The authors present an integrated technology of coal and coke dust processing, including oil agglomeration of input components and fuel briquetting using binder. The optimal binder is chosen to be heavy coal-tar. Influence of a type of compaction and content of different binders on strength of fuel briquettes is analyzed. The quality characteristics of concentrate obtained from dressed coal and coke dust and fuel briquettes made of the concentrate are presented.
																								



6.
Statistical Reliability of Forecasting Peak Vibration Velocity under Large-Scale Production Blasting

A. G. NOVIN’KOV1, S. I. PROTASOV2, P. A. SAMUSEV2, A. S. GUKIN1
1Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
2Kuzbass-NIOGR Innovation Company, Pionerskii blv. 4A, Kemerovo, 650054 Russia
Keywords: открытые горные работы, пиковая скорость колебаний, вибрация, вызванная взрывами, регрессионный анализ, прогнозирование пиковой скорости колебаний, массовые взрывы на горных предприятиях, open pit mining, peak vibration velocity, blast-induced vibration, regression analysis, peak vibration velocity forecasting, large-scale blasting in mines

Abstract >>
The authors review methods to assess reliability of forecasting of peak vibration velocities under large-scale production blasting using statistical analysis of regression residuals. The regression analysis of experimental data and the subsequent statistical analysis of the regression residuals is exemplified.
																								



7.
Mechanisms of Change in Physical Properties of Soil under Experimental Electrochemical Reinforcement

S. M. PROSTOV1, N. YU. NIKULIN2
1Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
2NOOSTROY LTD, ul. Voroshilova 30, Kemerovo, 650056 Russia
Keywords: электрохимическое закрепление, физические свойства грунтов, электрическое зондирование, георадиолокация, electrochemical reinforcement, physical properties, soil, electrical sounding, GPR positioning

Abstract >>
The article describes integrated experimental research into mechanisms of change in physical properties of soil under electrochemical reinforcement implemented in a test area. The monitoring methods involved geological engineering survey, laboratory testing of soil samples, as well as statistical, geomechanical, seismic, electrical and georadar sounding. It has experimentally been proved that three zones (strengthening, dehumidification and transient) are formed in the interelectrode space; the ranges of space and time change in humidity, deformation modulus, cohesion, internal friction angle, elastic wave velocities, electrical resistivity and integral parameters of georadargrams are found. The authors substantiate ways of improving efficiency of two- and one-stage schemes of electrochemical soil reinforcement and application areas of geophysical monitoring techniques.
																								



8.
Rock Failure Forecasting with 3D Modeling Using Probabilistic Cellular Automata

D. V. ALEKSEEV1, G. A. KAZUNINA2, A. V. CHEREDNICHENKO2
1Kemerovo Institute, Plekhanov Russian University of Economics, Kuznetskii pr. 39, Kemerovo, 650992 Russia
2Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
Keywords: моделирование накопления повреждений, импульсная эмиссия, предвестники разрушений, damage accumulation modeling, emission of impulses, failure signs

Abstract >>
The authors construct 3D probabilistic cellular automata to model accumulation of elementary damages and evolution of their cluster structure. Kinetic dependences of number of the clusters and evolution of time correlation functions are studied for the number of clusters and number of elementary damages. It is proved that intersection of the time autocorrelation function of a random process “number of impulses of emission” with the local minimum in the field of negative correlation can be interpreted as a sign of transition of a loaded material to a stage immediately preceding irreversible failure.
																								



9.
Route Map for Innovation Development in Coal Kuzbass

YU. A. FRIDMAN1, G. N. RECHKO1,2, E. YU. LOGINOVA1
1Institute of Economics and Industrial Engineering, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrentieva 17, Novosibirsk, 630090 Russia
2Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
Keywords: Кузбасс, угольная отрасль, драйвер роста, инновационная трансформация, региональное развитие, территориальный кластер, Kuzbass, coal industry, progress driver, innovation-based transformation, regional development, regional cluster

Abstract >>
The presented information is a part of the authors’ research in the field of effect exerted by innovative development of coal business on competitiveness of a region. The described conceptual model of innovation-based transformation of the coal industry in Kuzbass rests upon coordination of interests of business and authority with the purpose to improve competitive ability of a region. With this model, it is proposed to develop a route map for modernization of regional coal mining industry, which should create conditions for the coal industry to change over from being a donor to becoming a driver of economics in the Kemerovo region. At the same time, this will enable appraisal of federal and regional reserves to be efficiently used in implementation of this ambitious, difficult and expensive “project”.
																								



10.
Ecological Risk Management in Coal Mining and Processing

V. G. MIKHAILOV1, A. G. KORYAKOV2, G. S. MIKHAILOV1
1Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
2Lomonosov Moscow University of Fine Chemical Technology, pr. Vernadskogo 86, Moscow, 119571 Russia
Keywords: угледобывающие предприятия, экологические риски, загрязнение окружающей среды, экологический риск-менеджмент, coal mines, ecological risks, environmental pollution, ecological risk management

Abstract >>
The article describes the analysis of theoretical and applied aspects of ecological risk management in terms of coal mining and processing companies, as well as assigns and solves tasks on identification of ecological risks, assessment of probability of undesired events, determination of structure of probable damage, assessment of risk, estimation of technological and organizational methods and measures of influence on ecological risk to reduce and avoid it, and decision-making on practical introduction of particular risk management and control measures. The groups of technological and organizational measures aimed to minimize or neutralize risks are considered. The key result of the research is the package of measures of ecological risk reduction, in particular: technologies of ultradeep purification of dielectric liquids; introduction of processing equipment for used-up tyres of heavy open pit dump trucks; formation and updating of quality management system; improvement of efficiency of reclamation of disturbed lands; treatment of hydraulic mining and coal processing waste.
																								



11.
Stress State of Rocks Surrounding Excavation under Variable Young Modulus

M. V. KURLENYA, V. E. MIRENKOV, A. A. KRASNOVSKY
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 4, Novosibirsk, 630091 Russia
Keywords: выработка, порода, большая глубина, физические эффекты, модуль Юнга, граничные условия, аналитическое решение, система сингулярных интегральных уравнений, excavation, rock, great depth, physical effects, Young modulus, boundary conditions, analytical solution, singular integral equations system

Abstract >>
Deep-level mining needs extra data on physical behavior of rocks at great depths (under high stresses). Without such data, any computations for deep-level technologies based on analogy with shallow-depth technologies are non-diagnostic. Elastic moduli of rocks may depend on the accumulated plastic deformation and their reduction is considerable in the known tests of metals. It seems interesting to study the influence of this property of rocks on distribution of residual stresses and displacements. Elastic transformation of an excavation after drivage (relief of stresses) largely affects surrounding rock mass and results in origination of a transition layer around the excavation. A local drop of deformation energy takes place in the surrounding rocks, which reduces stress concentration. The problem is studied based on an analytical solution obtained for a deep round excavation subjected to constant value compressive stresses at infinity and a solution taking into account the Young modulus. The article offers an algorithm for geomechanical condition of tocks and determines ranges for stresses and displacements in the zone of influence of excavation. Examples of calculations are given, and the results are discussed.
																								



12.
Joint Processing of Microseismic Monitoring Data in Surface and Underground Mineral Mining

G. N. LOGINOV1,2,3, S. V. YASKEVICH1,2, A. A. DUCHKOV1,2,3, A. S. SERDYUKOV1,2,3
1Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia
2Trofimuk Institute of Oil and Gas Geology and Geophysics Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090 Russia
3Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: микросейсмический мониторинг, система сбора данных, обратная кинематическая задача, локация гипоцентров, microseismic monitoring, data acquisition system, inverse kinematic problem, hypocenter positioning

Abstract >>
The article discusses optimization of microseismic monitoring in hard mineral mining. A procedure has been developed to estimate accuracy of positioning of seismic event hypocenters. The advantage of combination observation system with distributed underground receiving antennas and additional sensors installed at a distance from a productive seam plane is illustrated. The obtained results are important for optimizing observation systems and improving efficiency of microseismic monitoring in hard mineral mining.
																								



13.
Numerical Analysis of Plastic Behavior of Granular Media Exposed to Deformation under Broken Trajectory Loading

S. V. KLISHIN, A. F. REVUZHENKO
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: континуальная модель, сплошная среда, гранулированный материал, напряженное состояние, дилатансия, метод дискретных элементов, численный анализ, continuum model, continuum medium, granular material, stress state, dilatancy, discrete element method, numerical analysis

Abstract >>
Based on DEM, the problem on uniform shearing of granular material specimen is considered, the shape of the particles was chosen to be spherical, with assigned distribution per radii. At interfaces of the particles, dry friction and viscosity were taken into account. Loading was implemented as simple and broken trajectory shearing. The load trajectory was broken by means of sudden change in the shearing direction. It has been found that in this case, dilatancy rate and angle between axes of stress tensors and strain rates change jump-wise. The discrete medium shows the properties of the continuum model of granular material with internal friction and dilatancy. The authors discuss a criterion of the continuum model to be equivalent to the initial discrete model. Applicability of the numerical results to the continuum modeling of deformation is demonstrated.
																								



14.
Control of Dynamic Rock Pressure Events Using Improved EME Recording Instrumentation

A. A. BIZYAEV, G. E. YAKOVITSKAYA
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: горные выработки, разрушение, электромагнитное излучение, регистрация, приборы, диагностика, mine workings, failure, electromagnetic emission, recording, instrumentation, diagnosis

Abstract >>
The article reports electromagnetic emission (EME) measurements in rocks using REMI-2 equipment and recording-diagnosing system RDS REMI-3 developed jointly at the Institute of Mining and Novosibirsk State Technical University. REMI-2 measures EME signal strength and displays the results digitally. RDS REMI-3 is advantageous over earlier designed equipment as it downloads measurement data in the embedded memory. The EME records are displayed as oscillograms to enable detecting initial stage of rock failure based on analysis of change in structure, parameters and spectrum-and-time behavior of EME signals.
																								



15.
Permanent-Magnet Synchronous Generator Voltage Stabilization by Rotation Frequency Variation in Self-Contained Power Supply Systems

B. F. SIMONOV1, S. A. KHARITONOV2, A. V. SAPSALEV2
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2Novosibirsk State Technical University, pr. K. Marksa 20, Novosibirsk, 630073 Russia
Keywords: синхронный генератор, постоянные магниты, переменная частота вращения, стабилизация напряжения, регулировочная характеристика, synchronous generator, permanent magnets, variable rotation frequency, voltage stabilization, regulating characteristic

Abstract >>
Under consideration is feasibility of voltage stabilization in permanent-magnet synchronous generator with variable frequency in self-contained systems of power supply. The method of stabilization is based on varying frequency of rotation of generator shaft. The authors have derived analytical expression for regulating characteristics and determined required ranges for rotation frequency variation at preset parameters of generator and loading. The symmetry conditions are found for a regulating characteristic relative to rotation frequency change.
																								



16.
Sulfhydryl Phosphorus-Containing Collectors in Flotation of Copper-Nickel Platinum-Group Metals

V. A. CHANTURIA, A. A. LAVRINENKO, L. M. SARKISOVA, T. A. IVANOVA, N. I. GLUKHOVA, E. A. SHRADER, I. V. KUNILOVA
Research Institute of Comprehensive Exploitation of Mineral Resources-IPKON Russian Academy of Sciences, Kryukovskii tupik 4, Moscow, 11120 Russia
Keywords: Медно-никелевая руда, пирротин, пентландит, платиновая чернь, фосфорсодержащие сульфгидрильные собиратели, диизобутилдитиофосфинат натрия, флотация, электродный потенциал, гидрофобность поверхности, адсорбция, copper-nickel ore, pyrrhotine, pentlandite, platinum black, sulfhydryl phosphorus-containing collectors, sodium di-isobutyl dithiophosphinate, flotation, electrode potential, surface hydrophobicity, adsorption

Abstract >>
The analysis involves influence of sulfhydryl phosphorus-containing collectors (SPC) on flotation of copper-nickel ore bearing metals from platinum group. Efficiency of SPC and butyl xanthate combination is illustrated, and their optimal ratio is determined. The authors study influence of the test agents on electrode potential and hydrophobic behavior of pyrrhotine, pentlandite and platinum black. UV and IR spectrophotometry has shown origination of disulfide di-isobutyl dithiophosphinate on the surface of pyrrhotine.
																								



17.
Modifying Acid-Base Surface Properties of Calcite, Fluorite and Scheelite in Electromagnetic Pulse Treatment

M. V. RYAZANTSEVA, I. ZH. BUNIN
Research Institute of Comprehensive Exploitation of Mineral Resources-IPKON Russian Academy of Sciences, Kryukovskii tupik 4, Moscow, 11120 Russia
Keywords: кальцит, флюорит, шеелит, наносекундные электромагнитные импульсы, индикаторный метод, кислотно-основные свойства, поверхность твердого тела, calcite, fluorite, scheelite, nano-second electromagnetic pulses, indicator method, acid-base properties, solid surface

Abstract >>
With acid-base indicators, the change in functional composition of surface of calcite, fluorite and scheelite under the action of high-voltage nano-second pulses has been analyzed. After impulse treatment of mineral samples for t ≤ 50 s, the concentration of electron-donor Lewis (рКа = - 4.4) and proton-donor (рКа = 1.3, рКа = 4.1) Brønsted centers has grown on the surface of calcite. It is shown in the article that basic transformations of fluorite and scheelite surface under pulse treatment are connected with mutual transformations of Lewis bases and Brønsted acids.
																								



18.
Optimized Activity Ratio for Different Types of Adsorption of Reagent on Sulfide Minerals

S. A. KONDRAT’EV1, N. P. MOSHKIN2, E. A. BURDAKOVA1
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2Lavrentiev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrentieva 15, Novosibirsk 630090 Russia
Keywords: флотация, сульфиды, физическая и химическая форма сорбции, минеральная частица, мениск, критическая толщина прослойки, селективность, flotation, sulfides, physical and chemical adsorptions, mineral particle, meniscus, critical film thickness, selectivity

Abstract >>
The authors evaluate the ratio of activities exhibited by physical and chemical adsorptions of an agent on sulfide minerals. The following assumptions are made: 1) the main kinetic restriction for flotation contact (particle-bubble interaction) is the film between mineral particle and air bubble; 2) water is removed from the film by both physical and chemical adsorptions; 3) the water volume removed by physical adsorption is conditioned by the difference in the volumes of water in the films bounded by meniscuses with advancing angle Θ A and receding angle Θ R and neck radius R. The water volume removed under the action of surface forces (hydrophobic, dispersive) was disregarded as the agent attachment was low dense and mosaic. The article reports experimental data on limit values of static advancing and receding angles on the surface of some sulfide metals. It is shown that selectivity of flotation of sulfides depends on the ratio of water volumes removed from the film by desorbable physical adsorption and non-desorbable chemical adsorption types of agents. The proposed method of selectivity estimation is suitable for minerals with similar (close) properties of the surface when stabilizing ion-electrostatic interaction between minerals and air bubbles is absent or insignificant. The calculation results may be of use to optimizing collecting ability of physically adsorbed low-polar or desorbable derivants of ionized agent with intent to improve selectivity of separation of sulfide minerals.
																								



19.
Copper Adsorption at Porozhinsky Manganese Ore

G. R. BOCHKAREV, K. A. KOVALENKO, G. I. PUSHKAREVA
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: марганцевая руда, медь, кинетика сорбции, изотерма сорбции, manganese ore, copper, adsorption kinetics, adsorption isotherm

Abstract >>
The authors have analyzed copper adsorption at manganese ore from Porozhinsky province. The results allow a hypothesis on the mechanisms of adsorption kinetics: adsorption rate is limited both by diffusion processes and by chemical interaction. The analysis of adsorption isotherm and its mathematical processing show that copper exhibits strong affinity toward manganese ore surface; the Langmuir equation describes the copper adsorption equilibrium with high correlation factor. The Gibbs energy has negative value.
																								



20.
Prediction of Structural-Chemical Change in Minerals under Mechanical Impact during Grinding

T. S. YUSUPOV1, F. KH. URAKAEV1, V. P. ISUPOV2
1Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrentieva 3, Novosibirsk, 630090 Russia
2Institute of Chemistry of Solid and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128 Russia
Keywords: минерал, тонкое измельчение, дефектообразование, аморфизация, растворимость, флотируемость, поверхностно-активные вещества, mineral, fine grinding, defect formation, amorphization, dissolvability, floatability, surfactants

Abstract >>
There is sufficient experimental database thus far collected on structural and chemical changes in minerals with different types of chemical bonding under activation grinding. The research has shown the possibility to predict specifics of grinding and defect formation in minerals with different types of chemical bonding. The article shows that type and number of defects formed on the surface of minerals govern important processing properties of the minerals such as capacities to be hydrated, dissolved, floated etc.
																								



21.
Cloud Computing for Seismic Data Processing Based on Voronoi Diagrams Using Google App Engine

V. P. POTAPOV1, V. N. OPARIN2, O. L. GINIYATULLINA1, I. E. KHARLAMPENKOV1
1Institute of Computational Technologie Siberian Branch, Russian Academy of Sciences, ul. Rukavishnikova 21, Kemerovo, 650025 Russia
2Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: геомеханико-геодинамическая безопасность, угледобывающие районы Кузбасса, геоинформационные технологии, web-сервисы, облачные хостинги, миграция сейсмособытий, обработка сейсмологических бюллетеней, geomechanical and geodynamic safety, coal mining areas in Kuzbass, geoinformation technologies, web-services, cloud hostings, seismic event migration, seismic report processing

Abstract >>
The authors offer a new approach to processing seismological reports using Voronoi diagrams to detect clustered dynamic events in an area exposed to high production loading, implemented as a cloud service in the framework of geomechnical-geodynamic safety system of Kuzbass. The cloud service allows pre-processing of array of seismic events prior to computation of migration trajectories of reduced seismic energy release centers according to Oparin, which greatly improves computation accuracy. The article reports the results of seismicity assessment for the Kemerovo Region using the chain of services “Voronoi diagram-migration trajectories of reduced seismic energy release centers”.
																								



22.
Protection of Operating Degassing Wells from Air Flow from Underground Excavations

T. V. SHILOVA, S. V. SERDYUKOV
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: угольный пласт, дегазационная скважина, направленный гидроразрыв, непроницаемый экран, предотвращение подсосов воздуха, давление разрыва, скважинное оборудование, coal bed, degassing well, directional hydraulic fracturing, impermeable screen, air leak-in prevention, fracturing pressure, well equipment

Abstract >>
The article considers the method of recovering structural integrity of operating degassing wells without outage and the scheme of cross-wise hydraulic fracturing in well bottom zone using mechanical anchor. Advantages of the scheme with anchor are discussed as against directional fracturing with a slot initiator. The technical solutions on protection of methane drainage zone from air leaks from underground excavations are presented.
																								



23.
Processing and Measuring Equipment Haulage in Uncased Boreholes

V. V. TIMONIN, A. S. KONDRATENKO
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: скважинные горные технологии, геофизические исследования скважин, система транспорти-рования оборудования в горизонтальных скважинах, пневмоударное устройство, drilling technologies, geophysical borehole investigations, equipment haulage system for horizontal boreholes, pneumatic percussion device

Abstract >>
Results of design and analysis of system for haulage of equipment in uncased boreholes drilled from underground excavations are reported. A thruster is a pneumatic percussion device. The optimal parameters of the haulage system operation in various conditions are determined. Using mathematical description of movement of thruster in well, the authors derive relations for the thruster velocity as a function of various initial data.