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.     

Studies on fracture of rock blocks

To describe deformation of rock blocks with a fracture under breaking loading, a system of singular integral equations is derived and the numerical results are discussed. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 10–17, March–April, 2006.     

Influence of sign-variable temperature on rock strength

All-Union Scientific-Research Institute of Mine-Surveying (VNIMI), Leningrad. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 28–33, January–February, 1989.     

Limiting state of rock mass around mine workings,considering anisotropy in the strength properties of the rock

G. V. Plekhanov Mining Institute, Leningrad. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 12–21, May–June, 1990.     

Predicting the limiting zones of interseam rock

All-Union Scientific-Research Institute of Mine Surveying, Leningrad. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 3–7, September–October, 1988.     

Investigation of the advance unloading of a rock mass on three-dimensional models

Mining Institute, Academy of Sciences of the Ukrainian SSR, Dnepropetrovosk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp 20–24, July–August, 1988.     

Relative strength characteristics of fragments of a blasted rock mass and the blocks of a rock mass

All-Union Scientific-Research and Design Institute for Raw Building Materials, Moscow. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 38–44, January–February, 1989.     

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.     

Characteristics of rock pressure manifestations on reinforced-concrete tubular shields

Conclusions Investigations have confirmed the principal laws of the effect of rock pressure on shield supports and established the characteristic features of this effect on reinforced-concrete shields. The mean load on a ZhTShch-500 shield is 11.5–13.0 tons/m², which is 1.3 times greater than the mean loads on timber shield canopies. The overload coefficient of ZhTShch-500 shields is 1.6. Use of the established values in calculations ensures a load-bearing capacity of reinforced-concrete tubular shields equal to 30–35 tons/m², which should completely eliminate the possibility of failure of the load-bearing members of the canopy. During shield advance, the load increases to 20–25 tons/m² and then becomes stable. The appearance of peak loads after a shield advance of 35–40 m is due to caving of the roof. The intensity of loading is affected by the rate of shield advance and the uniformity of its displacement. Longitudinal loads due to displacement of the immediate and main roofs do nothave a marked effect on the deformation of the chief load-bearing elements of reinforced-concrete tubular shields. Institute of Mining, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 106–109, September–October, 1969.     

Effect of circular geologic structures of the Khibin intrusion on the stressed state of the rock

Mining Institute, Kola Branch, Academy of Sciences of the USSR, Apatity. Translated from Fiziko-Tekhnicheskoe Problemy Razrabotki Polezhnyk Iskopaemykh, No. 3, pp. 3–10, May–June, 1989.     

Statistical models of the probability distribution of the dielectric parameters of rock

Karaganda Polytechnic Institute. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 70–75, January–February, 1991.     

Rock drillability classification. Part II: Canonical representation of rock properties in the rock classification by fracture resistance

A multifactor classification of rocks by drillability is proposed based on canonical representation of the mechanical and structural properties of rocks by the dimensionless characteristics of rock fracture resistance. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6. pp. 86–104, November–December, 2008.     

Analysis of deformation of the compound rock blocks with cracks

The paper presents a derivation method for systems of singular integral equations for a rock block composed of two uniform parts with a crack. The resultant equations and numerical implementation data are discussed. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 28–40, March–April, 2007.     

Numerical modeling of rock failure

Numerical calculations for the magnitudes of stresses at the instant of failure and angles at which it occurs are presented on the basis of stiff- and elastoplastic body models for plane and axially symmetric strain. Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 36–44, March–April, 2000.     

Contact problems in rock mechanics

The review of publications on investigation into the contact problems in rock mechanics is presented. Derivation of system of singular integral equations for rock blocks under compound load conditions is reported. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 36–48, July–August, 2007.     

Stress measurement in a rock bed based on emission memory effects

Institute of Mineralogic Studies, Academy of Sciences of the USSR. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp 23–28, March–April, 1990.     

Rockburst-hazard criterion of rock mass

Technological operations employed in preparing blocks for mining by the induced block-caving system are investigated. An estimate is given for the stress-strain state of the mass, and a rockburst-hazart criterion of deposit adopted as the ratio of the seismic energy accumulated in the rock mass to the potential energy contained in the explosion of charge is substantiated. Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 44–47, November–December, 1999.     

Calculation of the stress state of a rock mass using in-situ data on depormation

The stress-strain state of three basic problems of elasticity theory is investigated for any part of a rock mass modeled by a half-plane. An integral relation is established between the stress and displacement components of the boundary of the half-plane. This makes it possible to obtain all components in explicit form through the boundary conditions. These results permit use of in-situ stress and/or displacement measurements to restore deformation in the half-plane. Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No 3, pp. 27–35, May–June, 1999     

Comparison of rock mass classification systems

The paper presents the comparison of the most widely-applied rock-mass classifications RMR and Q and a system developed by VNIMI in Russia. It has been shown that the results obtained from using these systems for the forecast of rock mass stability and selection of support types enjoy a satisfactory conformity. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 71–75, July–August, 2007.