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2016 year, number 3

1.
Procedure and Evidence of Seismic Research into Physico-Mechanical Properties of Cohesive Soils

M. V. KURLENYA1, A. S. SERDYUKOV1,2,3, G. S. CHERNYSHOV2,3, A. V. YABLOKOV2,3, P. A. DERGACH2, A. A. DUCHKOV2,3
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2Trofimuk Institute of Oil and Gas Geology and Geophysics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090 Russia
3Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia
Keywords: инженерно-геологические изыскания, малоглубинная сейсморазведка, метод преломленных волн, многоканальный анализ поверхностных волн, волна Рэлея, физические и механические свойства грунтов, связные дисперсные грунты, geological engineering, shallow seismic exploration, seismic refraction technique, multi-channel surface wave analysis, Rayleigh wave, physical and mechanical properties of soil, cohesive dispersed soil

Abstract >>
The article puts forward a procedure to determine structure and physico-mechanical properties of near-surface cohesive soil based on seismic surveying. The backbone of the approach is the use of distribution of P- and S-waves obtained from combination of the seismic refraction technique modification and the multi-channel surface wave analysis. The recovery of the physico-mechanical properties uses correlation dependences. The authors give an example of field data processing. The field research covered a section of a motor road where groundwater level is determined and zones subjected to washout and deformation are detected.



2.
Evolution of Stresses and Permeability of Fractured-and-Porous Rock Mass around a Production Well

L. A. NAZAROVA1,2, L. A. NAZAROV1,2
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia
Keywords: трещиновато-пористый породный массив, пороупругость, поропластичность, двойная пористость, фильтрация, эволюция напряжений, зона разрушения, численное моделирование, fractured-and-porous rock mass, pore elasticity, pore plasticity, double porosity, seepage, stress evolution, fracture zone, numerical modeling

Abstract >>
The authors model deformation and mass transfer in jointed and porous rock mass around a production well. The modeling based on the concept of a continuum with double porosity uses an original method with finite difference solution of mass transfer equations and analytical solution of pore elastoplasticity equations. From the numerical experiments, dimensions of irreversible straining zones in the well bore zone grow with the parameter Bio. The estimate of the reservoir permeability decline in the course of operation, obtained from the pore elasticity and pore plasticity models, qualitatively agrees with the in situ observation data.



3.
Method of Stress Calculation in Rock Mass around Underground Openings, Considering Weight Characteristics

V. E. MIRENKOV
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: выработка, порода, пласт, уравнение, решение, вес, напряжения, смещения, обратные задачи, underground opening, rock, bed, equation, solution, weight, stress, displacement, inverse problem

Abstract >>
The practical calculation of rock mass deformation around an underground opening accounts for the weight of rock mass by solving a complimentary problem on “weightless” rock mass. A domain with an opening is bounded by a plane with the preset zero vertical displacements, which enables taking into account difference of pressure along the height of the opening. This solution, with the adequately selected boundary conditions, is added with stress field of an intact rock mass and offers zero boundary conditions at the future opening perimeter, however, the issue on the validity of setting boundary conditions at the lower boundary of the calculation domain remains yet to be handled. This article presents a phenomenological model of rock mass deformation to answer the set question. It is taken into account that action of roof rock weight coincides with the orientation of tensile stresses at the opening perimeter and differs from it in the floor. The author thinks it is required to add the class of inverse problems of rock mechanics with the problems directly accounting for rock weight.



4.
Geomechanical Evaluation of Roof-and-Pillar Parameters in Transition to Underground Mining

A. B. MAKAROV1, I. YU. RASSKAZOV2, B. G. SAKSIN2, I. S. LIVINSKY1, M. I. POTAPCHUK2
1SRK Consulting (Russia) Ltd, ul. Kuznetskii most 4/3, Bld. 1, Moscow, 125009 Russia
2Institute of Mining, Far East Branch, Russian Academy of Sciences, ul. Turgeneva 51, Khabarovsk, 680000 Russia
Keywords: горно-геологические условия разработки, геодинамическое районирование, горные породы, напряженно-деформированное состояние, рейтинговые показатели, физико-механические свойства, математическое моделирование, параметры системы разработки, ground conditions, geodynamic zoning, rocks, stress state, rock mass rating indexes, physico-mechanical properties, mathematical modeling, mining system parameters

Abstract >>
The authors present studies into geomechanics of Berezitovoe gold-polymetal deposit at the stage of transition from open pit to underground mining. The authors have carried out geodynamic zoning and evaluated parameters of modern stress field. Rock mass ratings are used to assess physico-mechanical properties of rocks. Rock mass stress state at various stages of mining is examined using numerical modeling, and underground mining system parameters are evaluated using Mathews procedure and analytical relations.



5.
Deformation Criterion of Salt Rock Failure

V. N. APTUKOV1,2
1Perm State National Research University, ul. Bukireva 15, Perm, 614000 Russia
2Galurgia JSC, ul. Sibirskaya 94, Perm, 614000, Russia
Keywords: деформационный критерий разрушения, соляные породы, потеря несущей способности, численное моделирование, deformation criterion, failure, salt rocks, strength loss, numerical modeling

Abstract >>
The author offers a new deformation criterion for the compressive strength of salt rock specimens. The limiting principal strain is a function of stress parameter in the form of a ratio of hydrostatic pressure and stress intensity. The safety factor based on the deformation criterion is defined. The numerical modeling of experimental compression of various geometry specimens produces the deformation criterion for sylvinite and carnallite of Upper Kama deposit. The offered criterion is applicable to assessment of load-bearing capacity of stopes in salt rocks.



6.
Calculations of Strength of Overburden Dumps on Weak Bases

S. P. BAKHAEVA, V. A. GOGOLIN, I. A. ERMAKOVA
Gorbachev Kuzbass State Technical University, ul. Vesennyaya 28, Kemerovo, 650000 Russia
Keywords: отвал, слабое основание, метод конечных элементов, напряженно-деформированное состояние, смещение, критерий прочности Кулона-Мора, dump, weak base, finite element method, stress state, displacement, Mohr-Coulomb strength criterion

Abstract >>
The scope of the discussion covers the issues of open pit mining efficiency and safety with dry overburden dumping over clayey alluvium. The stress analysis of a dump at Kedrovsky open pit mine uses finite element modeling of linearly deformable medium based on geotechnical, surveying and hydromechanical data. The modeling produces the field of displacements of the dump and its base and the distribution of the Mohr-Coulomb strength criterion. The clayey rock breakout-hazardous areas are revealed, and displacements of the growing dump are predicted. The developed model enables operational forecasting of strength loss at dumps.



7.
A New Index of Rock-Breaking Tool Efficiency

B. L. GERIKE, V. I. KLISHIN, P. B. GERIKE
Institute of Coal, Siberian Branch, Russian Academy of Sciences, pr. Leningradskii 10, Kemerovo, 650065 Russia
Keywords: дисковый инструмент, массив полезного ископаемого, показатели прочности, разрушение, энергозатраты, коэффициент эффективности действия, disk tool, rock mass, strength indexes, failure, energy input, efficacy coefficient

Abstract >>
Based on the analysis of qualitative interaction between rocks and a rock-breaking tool, a new coefficient of the tool efficiency is proposed. This coefficient makes it possible to estimate the quality of the tool impact on broken rocks and to predict energy input of rock breaking and, consequently, productivity of mining machines in specific geotechnical conditions.



8.
Multiple Directional Hydraulic Fracturing with Chemically Active Mixtures

I. V. KOLYKHALOV, A. V. PATUTIN
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: гидроразрыв пласта, трещина гидроразрыва, термошахтная разработка, тяжелые нефти, hydrofracturing, hydrofracture, thermal mining, low-gravity oil

Abstract >>
The authors analyze numerically growth of a cross fracture between two existing fractures under multiple directional hydrofracturing using chemically active mixtures. The scope of the studies embraces effect exerted by problem parameters, such as value and orientation of external compression field, rate of healing of fractures, size and intermediate spacing of fractures, on deviation of a fracture from its initial orientation. The results are meant for optimization of the local hydrofracturing method for steam-distribution and producing wells in low-gravity oil reservoirs.



9.
Selection of Electrohydraulic Crushing Parameters for Quartz Ore

S. R. KORZHENEVSKY, V. A. BESSONOVA, A. A. KOMARSKY, V. A. MOTOVILOV, A. S. CHEPUSOV
Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, ul. Amundsena 106, Ekaterinburg, 620016 Russia
Keywords: Электрический пробой жидкости, импульсный пробой твердого диэлектрика, ударная волна, генератор высоковольтных импульсов, измельчение минеральных материалов, рудоподготовка, electric fluid breakdown, solid dielectric impulse breakdown, shock wave, high-voltage pulse generator, mineral crushing, ore pretreatment

Abstract >>
Under analysis is electrohydraulic crushing of rocks under electric charge using nanosecond high-stress pulses to optimize ore pretreatment. A nanosecond high-voltage generator of pulses at a capacity to 500 MW is designed and tested. A flow-through discharge cell at a voltage to 550 kW is developed. The new method of mineral crushing is highly efficient and enables designing commercial plants for electrohydraulic rock processing.



10.
Estimate of Blow Frequency Range for an Air Drill Hammer with a Ring-Shaped Elastic Valve in Backstroke Exhaust Line

V. V. CHERVOV, B. N. SMOLYANITSKY, I. V. TISHCHENKO
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: Пневмомолот, упругий клапан, расход воздуха, частота ударов, энергия удара, air drill hammer, elastic valve, air flow rate, blow frequency, blow energy

Abstract >>
The authors report and discuss the experimental results on an air drill hammer with an elastic valve installed in the backstroke exhaust line for mechanical closing. It is approved that such air hammer is capable to ensure the wanted blow capacity at fixed blow energy by varying blow frequency through adjustment of cross section choke coupling the backstroke and front stoke chambers of the hammer. With larger cross section of choke coupling, the maximum blow frequency is achieved and remains the same later on.



11.
Calculating Bending Vibrations of Axial Main Mine Fan Rotor Shaft

A. M. KRASYUK, P. V. KOSYKH
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: Вентилятор, критическая частота, прецессия, гироскопический момент, податливость опор, эквивалентная нагрузка, диаграмма Кэмпбелла, fan, critical frequency, precession, gyroscopic moment, bearing assembly yielding, equivalent load, Campbell diagram

Abstract >>
The article presents a calculation procedure for limiting rotation frequency of an axial main mine fan rotor. The calculations are made for fan model VO-21. The suppositions that make the calculations simpler without considerable errors of the results are evaluated. The calculations use the finite element method and ANSYS software. The critical frequencies are determined from the Campbell diagrams plotted for the estimates with and without regard for the stiffness of the bearing assemblies of the rotor. The effect exerted by the rotor bearing assembly stiffness and by the gyroscopic moment of the fan impeller on the frequency of free bending vibrations of the rotor shaft under direct and back precession is illustrated. The estimated critical frequencies are compared with the analytical data obtained based on discrete two-mass models. For the preliminary engineering estimation, it is possible to use a discrete two-mass model of the fan rotor without regard for the yielding of the bearing assemblies and for the influence of the gyroscopic model; in the design model, it is required to replace the transmission shaft by the point mass. The calculation error will not exceed 7%.



12.
Hybrid Unit for Directional Hydrofracturing

YU. M. LEKONTSEV, A. V. PATUTIN, P. V. SAZHIN, O. A. TEMIRYAEVA
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: направленный гидроразрыв, скважина, инициирующая щель, directional hydrofracturing, drill hole, initiation slot

Abstract >>
The structural layout is presented for a hybrid unit for directional hydrofracturing with the description of operating principles of the unit in the mode of drilling and slotting. The kinematic parameters of the movable parts of the unit are calculated.



13.
Designs of Mine Shovels with Working Attachment of Nonclassical Structural Layout

S. V. DORONIN, YU. F. FILIPPOVA
Institute of Computational Technologies, Siberian Branch, Russian Academy of Sciences, pr. Mira 53, Krasnoyarsk, 660049 Russia
Keywords: расчетный случай нагружения, рабочее оборудование экскаватора, loading case, shovel working attachment

Abstract >>
A formalized approach is proposed to evaluating design loads on shovels with compound kinematic chains, based on numerical estimates of response of primary structural members to unit forces. The practical implementation of the approach uses structural layout of a mine shovel with electromechanical push-bars of pressure and uplift drives.



14.
Coalbed Methane Release as a Function of Coal Breakup

A. A. ORDIN1, A. M. TIMOSHENKO2
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2VostNII Science Center, ul. Institutskaya 3, Kemerovo, 650002 Russia
Keywords: шахта, угольный пласт, фракционный состав, сортность угля, метановыделение, скорость подвигания очистного забоя, mine, coalbed, breakup, coal sizing, methane release, production face advance

Abstract >>
The authors give theoretical and actual evidence of reduction in absolute methane release under higher rates of advance of production face in coal mines. The parabolic relation between methane release, feed speed and productivity of cutter-loader is evaluated.



15.
Experimental Studies into Technology of Generation of Pay Zones in Gold Mine Waste

V. S. ALEKSEEV, R. S. SERYI
Institute of Mining, Far East Branch, Russian Academy of Sciences, ul. Turgeneva 51, Khabarovsk, 680000 Russia
Keywords: техногенные россыпные месторождения, фильтрационные потоки, миграция частиц золота, формирование продуктивных зон, gold mine waste, seepage flows, gold particle migration, pay zone forma

Abstract >>
The experimental studies allow determining efficient parameters of a technology meant for formation of pay zones in gold mine waste dumps. The technology is applicable to developing gold mine waste early assumed unprofitable.



16.
Classification of Mineral Species on the Surface of Natural Diamond Crystals

V. A. CHANTURIA1, G. P. DVOICHENKOVA1, O. E. KOVAL’CHUK2
1Institute of Integrated Mineral Development-IPKON, Russian Academy of Sciences, Kryukovskii tupik 4, Moscow, 111020 Russia
2ALROSA Research and Geological Exploration Company, Chernyshevskoe shosse 16, Mirny, 678174 Russia
Keywords: минеральные образования, алмаз, кимберлит, гидрофильность, гидрофобность, классификация, mineral species, diamond, kimberlite, hydrophilic behavior, hydrophobic behavior, classification

Abstract >>
The analytical research has yielded differences in composition of mineral species on the surface of natural diamonds of hyperaltered kimberlites under conditions of diamond ore occurrence and processing. The classification of the mineral species is based on the mineral origin, properties and attachment on the diamond crystal surf.



17.
Collectability of Physically Adsorbed Xanthate Ion-Dixanthogen Associates

S. A. KONDRAT’EV, E. A. BURDAKOVA, I. A. KONOVALOV
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: флотация, флотационная активность реагента, эмульсия диксантогенида, поверхностное давление, прослойка жидкости, физическая форма сорбции, селективность, аlotation, flotation activity, dixanthogen emulsion, surface pressure, liquid film, physical adsorption, selectivity

Abstract >>
Under discussion is collectability of ethyl and butyl xanthate species resulted from non-stoichiometric interaction with oxidizer. It is visually proved that solution contains fine micro-drops stabilized by negative charge. The size and ζ-potential of micro-drops are determined together with the spreading velocity of emulsion over water surface. The mentioned velocity is higher than the spreading velocity of products of non-stoichiometric interaction between xanthate and heavy metal salt. The products of interaction between xanthates and oxidizers, at the moment of rupture of water film between mineral particle and air bubble, can detach from particle surface and attach to air-water interface (desorbable species DS). Spreading of a DS over the interface forces water out of the film. The forces applied to liquid in the film from the side of DS of ethyl and butyl xanthates are evaluated. The volume-flow rate of water from the film is related with the surface pressure of reagent species active at the air-water interface. The surface pressure of dixanthogen-xanthate emulsion is evaluated as a function on initial concentration of xanthate. Collectability of a reagent depends on the surface tension of solution of its DS and is governed by the structure of hydrocarbon fragment of the agent.



18.
Adsorption of Tannin-Bearing Organic Reagents on Stibnite, Arsenopyrite and Chalcopyrite in Complex Gold Ore Flotation

T. N. MATVEEVA, N. K. GROMOVA, L. B. LANTSOVA
Institute of Integrated Mineral Development-IPKON, Russian Academy of Sciences, Kryukovskii tupik 4, Moscow, 111020 Russia
Keywords: комплексные золотосодержащие руды, стибнит, халькопирит, арсенопирит, таннин, растительные экстракты, адсорбция, complex gold ore, stibnite, arsenopyrite, chalcopyrite, tannin, plant extract, adsorption

Abstract >>
The authors report studies into adsorption of tannin and cow-parsnip extract components on stibnite, arsenopyrite and chalcopyrite using UV spectroscopy, scanning laser microscopy and measurement of air bubble detachment from mineral particle. It is found that tannin and the organic reagents are selectively adsorbed on the surface of the listed sulfide minerals and exert selective effect on adsorption of sulfhydryl collecting agent, which, in its turn, may result in efficient recovery of the minerals in the proper concentrates under complex gold ore flotation.



19.
Improvement of Dissociation of Rebellious Minerals

T. S. YUSUPOV
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090 Russia
Keywords: руда, тонкая вкрапленность, минералы, сростки, измельчение, дезинтеграция, скорость соударения, прочность границ минералов, химическая связь, дефекты в структурах, ore, fine dissemination, minerals, aggregates, milling, disintegration, collision velocity, mineral interface strength, chemical bond, structural defect

Abstract >>
Under analysis is low efficiency of drum mills when dissociating higher strength aggregates of rebellious ore. It is shown that the main reason is insufficient destructive force. The structural-chemical characteristics of mineral aggregates and the role of defects in their dissociation are described. The author evaluates principles of estimating required energy input to dissociate aggregates composed of minerals with different types and values of interatomic and intermolecular bonds under high-power and high-velocity free impacts in disintegrators. By way of example, velocities of collision between minerals and disintegrator tools in dissociation of aggregates of sulfide and rare-metal ores and coal are given.



20.
Method to Make Nests of Useful Components by Way of Accumulation

A. G. MIKHAILOV, M. YU. KHARITONOVA, I. I. VASHLAEV, M. L. SVIRIDOVA
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, ul. Akademgorodok 50, Bld. 24, Krasnoyarsk, 660036 Russia
Keywords: геохимический сорбционный барьер, водный раствор, фильтрация, концентрирование, зона аэрации, geochemical sorption barrier, aqueous solution, permeation, concentration, aeration zone

Abstract >>
Experimental evaluation is given for mineral preconcentration in a bed of a sorption collector in percolation of low concentration useful components from aqueous solutions of salts. Sorption collectors represented by interlayers of lignite, peat, marble and vermiculite are included in an evaporation barrier installed in subsurface zone of rock mass aeration. Storage properties of such geochemical sorption barriers are examined. Migrating solution was aqueous solutions of salts of cobaltous and nickelous nitrates. It has been found feasible to shape beneficiation zones under up-going capillary permeation of the solutions through the sorption barriers in the zone of aeration in rock mass.



21.
Initiation of Underground Fire Sources

V. N. OPARIN1,2, T. A. KIRYAEVA1, V. YU. GAVRILOV3, YU. YU. TANASHEV3, V. A. BOLOTOV3
1Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia
3Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrentieva 5, Novosibirsk, 630090 Russia
Keywords: выбросо- и пожароопасность угольных пластов, уголь, пористость, температура, выход летучих, стадии метаморфизма, массо-газообменные процессы, химических состав газов, coal outburst- and fire-hazard, coal, porosity, temperature, volatile yield, ranks, mass- and gas-exchange processes, chemical composition

Abstract >>
Parameters of porous structure of different rank Kuzbass coal and gas- and mass-exchange processes under coal heating are analyzed. The main part of volatile matter is dissolved in the volume of coal layers. For all coal specimens, it is typical that mass fraction of methane and ethane decreases with temperature while mass fraction of hydrogen, carbonic oxide and ethane increases. The latter gases can be the sources of violent burning of coal beds. UHV pyrolysis of bituminous coal reveals physical balance and composition of gaseous products. The results permit coal rating based on carbonization, enable recommending using inert gases in underground fire fighting and allow estimating temperature level in fire source zones in coal beds based on chemical composition of emitted gases.



22.
Temperature Field Analysis in Salty Rocks at Shaft Mouth under Operation of a Freezing Unit

YU. A. KHOKHOLOV, A. S. KURILKO, D. E. SOLOV’EV
Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, pr. Lenina 43, Yakutsk, 677980 Russia
Keywords: математическое моделирование, криолитозона, теплообмен, вертикальный ствол, засоленные породы, замораживающая система, несущая способность свай, mathematical modeling, permafrost, heat exchange, shaft, salty rocks, freezing unit, load-bearing capacity, pole

Abstract >>
The 3D mathematical model of temperature conditions in salty rock mass at shaft mouth takes into account parameters and modes of freezing unit operation, temperature of ambient air and air in the shaft, as well as nonuniformity and rate of salinity of enclosing rocks. The model allows dynamics of temperature variation in rocks around the shaft and load-bearing capacity of each pole of head frame foundation depending on rock mass temperature and salinity. Different variants of freezing unit operation are considered to select the variants to ensure the required load-bearing capacity of the head frame poles and the diamond shaft lining safety.



23.
Modeling Temperature Field Dynamics in Post-Blasting Open Pit Mines in Permafrost

M. V. KAIMONOV, S. V. PANISHEV
Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, pr. Lenina 43, Yakutsk, 677980 Russia
Keywords: карьер, криолитозона, многолетнемерзлые породы, смерзание, температура пород, драглайн, математическое моделирование, open pit mine, permafrost, adfreezing, rock mass temperature, dragline, mathematical modeling

Abstract >>
The article discusses the case study of temperature behavior prediction in permafrost rock mass before and after blasting at Kangalass lignite deposit. It is illustrated how the blasting period is related with the temperature behavior in the disintegration of broken rocks. The results are the basis to predict dragline productivity in different seasons and to select efficient scheme for blasted rock removal.



24.
Down-the-Hole Measurement Tool for Gas Recovery and Coal Permeability

S. V. SERDYUKOV, T. V. SHILOVA, L. A. RYBALKIN
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Krasnyi pr. 54, Novosibirsk, 630091 Russia
Keywords: угольный пласт, скважина, газодинамические исследования, гидроразрыв, скважинный прибор, coal bed, hole, gas-dynamic research, hydrofracturing, down-the-hole tool

Abstract >>
A down-the-hole tool has been designed for gas-dynamic research of coal. The tool is manufactured based on the layout of a straddle packer with an adjustable interval. The tool design is suitable for hydrofracturing and gas-dynamic researches using the methods of indicator diagrams and pressure drop and recovery curves in package with relaxation of coal and rock mass by means of radially symmetric loading of hole walls in the hydrofracture interval.