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.     

Chamber Mining with Roof Caving at the Nikolaevsk Mine

The results are considered for the in situ testing of a new variant of chamber mining with roof caving by the chamber - pillar scheme under complicated conditions at large depths. It is shown that the increased horizontal stresses in a rock mass promote improvement of the undermined roof stability and give an opportunity to raise the volumes of chamber mining. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 60–67, July–August, 2005.     

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.     

Results of the integrated geophysical and geodetic investigation of the stress-strain state in Tashtagol Ore Field

The paper describes observations over the gravitation and electromagnetic field variations in a 900 m deep opening in Tashtagol Iron Ore Mine, as well as monitoring of movements in the rock mass and on the earth’s surface. The results provide characterization of the variability of the stress-strain state in the rock mass, and the rock pressure manifestations in the mining area. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 31–39, May–June, 2009.     

Mine stability with application of sublevel caving schemes

The paper expounds results gained in mathematical modeling of stress state of a rock mass under mining by sublevel caving with areal-frontal and frontal ore drawing schemes. Stability of underground excavations in the course of applying the compared methods is evaluated in terms of the Sheregesh deposit. The authors recommend on supporting the openings at the ore drawing-off level. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 90–100, January–February, 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.     

Estimate of stress state in rock masses adjacent to open pit walls

It is proposed to study the action exerted by the tectonic stresses on stability of open pit walls by using the method of core disking in exploratory holes and the tectono-physical method based on the analysis of tectonic structure of a rock mass. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 36–44, May–June, 2007.     

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.     

Mathematical Models of Block Media in Problems of Geomechanics. Part IV: Interaction of an Induced Structure and Stress State

A mechanical model of block rock-mass behavior when the block system depends on the existing stress-strain state is developed for the case of plane strain. The blocks are formed by intersecting nonorthogonal planes of weakening in the material, and the mathematical equations include elasticity constants for anisotropic body. The relations obtained for inelastic deformation (plasticity) of rock mass are illustrated by solving some problems of geomechanics. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 11–25, July–August, 2005.     

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.     

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.     

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.     

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.     

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.     

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.     

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.     

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.     

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.