Monitoring opencast operations with the use of laser systems

Results are presented or the first stage of the use of laser systems in coal opencasts to determine the “rock-coal” contact boundaries in the rock mass, as well as to create systems that will automatically update databases on the spatial position of workings in order to calculate the volumes of rock that have been moved. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 87–93, January–February, 2000.     

Rock movement at the Tashtagol iron-ore deposit in the course of large-scale underground blasting

The paper describes the results of studies into the processes of deformation of rock masses near protected objects and in mine workings of the Tashtagol iron-ore deposit, carried out with the conventional geodetic methods and the GPS-techniques. It is shown that rock mass movements in the periods of large-scale blasting mostly take place along flat-dipping tectonic faults and in the line of action of maximal stresses in the intact rock mass. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 25–33, May–June, 2008.     

Devices for Continuous Recording of the Parameters of Deformation — Wave Processes in Rock Mass. Part I: Measurement of Longitudinal Movements of Rocks in a Borehole and Design of the Position Sensor

A sensor for measuring movements in block rock mass through boreholes is presented. Being an organic part of multichannel instrumental set, the sensor ensures revealing of deformation changes in the controlled zones of block geomedia, which is of key importance when stress variations and fatigue failure in rock mass are determined. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 106–115, May–June, 2005.     

Geomechanical state of the rock mass at the Tashtagol Mine in the course of nucleation and manifestation of rock bursts

Integrated research data are presented for the earth motion and rock mass displacement at the Tashtagol Mine under general intensification of the dynamic geomedium activity, including periods of rock burst developments, by using conventional and satellite geodesy procedures. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 38–46, March–April, 2008.     

Calculation of stress-strain state in a rock mass with an oil formation

The papers considers the problems on deformation in a rock mass with an oil formation under condition of uncertain data on this rock mass. The pre-derived systems of integral equations are solved, and the results are discussed. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 29–37, March–April, 2008.     

Modeling the failure of rock blocks by blasting a cylindrical charge

The calculation model of breaking action exerted by a cylindrical charge blasted in a block rock mass is proposed. The deformation of a block medium in the zones of elasticity and heavy fragmentation is described by a continuum, properties of which are changed as compared with monolithic rocks. It is shown that the accounting of the block rock strength decrease in the massif influences greatly the calculated failure parameters and provides an opportunity to obtain fragmentation zone sizes, close to those observed in actual rock blasting. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 31–38, January–February, 2006.     

Math modeling of deformation of a rock mass with an oil-bearing bed

The authors offer the statement of the problem on the deformation of a piecewise-homogenous rock mass with an oil-bearing bed. The derived system of integral equations describes the stress-strain state on the contacts in such rock mass based on the in-situ data. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 3–10, September–October, 2007.     

On probable failure of an undercut rock mass

The paper analyzes probable failure conditions in an undercut piecewise-homogenous rock mass due to the low tension and compression strength limits as against the compression. The author derives singular integral equations for the determination of the stress jumps at different rock strata interfaces and considers numerical result. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 10–17, March–April, 2009.     

Effect of geological disturbances on the danger of rock bursts in a rock mass

Results are given for investigation of the effect of geological disturbances on the danger of rock burst in a rock mass during preparation and mining of operating blocks. Nature of the distribution of dynamic phenomena and the specific electrical resistance in the rock mass in regions of tectonic dislocations with a specific order of carrying out mining work are established which makes it possible to evaluate the efficiency of ore extraction technology. Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 14–20, January–February, 1999.     

Experimental investigation of spatial periodicity of induced deformations in a rock mass

The different-scaled periodicity of the non-uniform spatial distribution of deformations in a rock mass, resulted from its natural hierarchic block structure, is detected by using the Fourier and wavelet analyses. It is established that the block structure of the studied rock mass sections meets the concept on fundamental canonic series of geoblocks in the Earth’s crust. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 21–27, March–April, 2007.     

Estimate of the rock mass stress state in the course of mining the reserves subjacent the open pit bottom at the “Udachnaya” pipe

Using the mathematical modeling approach, the rock mass stress state is analyzed in the case of the open pit and underground mining of ore reserves of the “Udachnaya” pipe, the stability of the open pit walls and possible failure of the host rocks in the area of second working are estimated. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 25–35, July–August, 2007.     

Evaluation of Rock Mass Stability around Tunnels of the Irrigation System “Afrin”

Based on laboratory and in situ studies, geomechanical conditions of building free-flow tunnels of the irrigation system “Afrin” are evaluated. Recommendations for improvement of rock mass stability around mine workings are developed and taken for the use. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 35–48, July–August, 2005.     

Rock mass deformation modeling using the non-Archimedean analysis

The non-Archimedean space is a multi-scale one. The paper shows that this face is applicable to developing mathematical models of rocks exhibiting a hierarchy of structural levels. A closed model, considering anisotropy and weakening of a rock mass, is constructed. The equations in terms of displacements and the resultant internal force vector are derived. The authors have obtained the numerical solution to the problem on deformation of a rock mass around extended galleries, and showed how the areas of weakening and residual strength evolve. The energy flow lines are plotted. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 3–16, January–February, 2008.     

Causes of Technogenic Earthquake during Open Mining in the Khibiny Apatite Deposits

Based on an analysis of the results obtained from calculation of stress state in a rock mass in the vicinity of an open-pit mining under the action of gravitational and tectonic forces, the causes are substantiated for the technogenic earthquake in the Tsentralny mine of the “Apatit” Joint-Stock Company. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 11–16, May–June, 2005.     

Memory effects and variations of the physical fields and properties of rocks with the origination of dynamic phenomena in a rock mass

A relationship, which is independent of the scale of the object, is established between memory effects of a rock mass and precursors of natural and technogenic geodynamic events. State Mining University, Moscow. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 29–34, September–October, 1999.     

Investigation of stress fields occurred in the block caving process at a diasporite deposit in Western Turkey

The modeling with the finite element method was employed to study the block caving process for mining the Milas diasporite deposit in Western Turkey. The stress distribution in the vicinity of production and haulage levels is evaluated applying an elasto-plastic rock mass model. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 63–71, November–December, 2005.     

Geomechanical aspects of the genesis of exo-and endokarst

The paper gives grounds for the hypothesis that the existing kinds of karst are of the same nature that relates to evolution of a rock mass in the zones where endogenous ring-type structure emerge. A comparison is performed between the results of physical and numerical modeling of the karst generation and the in situ data. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 10–20, March–April, 2007.     

Determination of properties of structured rock mass by the acoustic method

An approach to determination of properties of a rock mass with a layered structure by acoustic sounding is proposed on the basis of solution of inverse problems of seismic probing. Methods for selecting the initial approximation ensuring convergence of iterative processes are indicated. The optimal parameters of the input signals and the duration of the output signal are found. It is shown that interlayer joints may serve as an indicator of the variation of external stress field in the mass. Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 36–44, May–June, 1999     

Estimation of the parameters of an imminent seismic event focus by the free surface strains

Dilatancy zones generated by an active internal source of isolated force in a heterogeneous rock mass are studied. Based on the solution of an inverse problem, the method is proposed for locating and determining the source focus parameters using the measurement data on strains of the daylight surface. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 25–35, May–June, 2007.     

Calculation model for breaking a lump off a rock mass by an impact of a blunt wedge-like tool

A mathematical model has been developed for the layer-by-layer fracture of a rock by a blunt wedge. The reduced efficiency of breaking by the blunt tool is estimated. It has been shown that there exists a limiting impact angle that confines the lump breaking off the rock mass. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 28–40, September–October, 2007.