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Roof displacement in working thick steeply dipping seams in the kuzbass to the rise with stowing of the worked-out area
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forces of sufficient magnitude for initiating and propagating fractures of depth adequate to relieve strain. Strain relief by borehole Jackfracturing was studied with finite element analysis and also by simple consideration of boundary conditions and external tractions. The dependence of the initial state of stress on the strain-relief measurema~ts at different orientations is obtained by employing the classical theory of elasticity. The instrumentation unique to the method, a borehole-loading device and a friction-straln-geuge module, were tested in the lsboratory, and the results are s,,-~q~ized. Field-stress measurements made in a ss.udstone quarry for the magnitude and orientation of the stresses are in good agrecment wlt~h those obtained by an independent overcorlng technique. 772093 ROCK BURSTS AND THE SEARCH FOR AN EARLY W.~RNING SYST~ Heunis, R Min Nag, V136, N2, Feb 1977, P83-89 S~,mm~rises the nature of gold mining operations in South Africa and goes on to discuss the rock burst research project at Western Deep Levels. An automatic seismic location system was developed, ecmsisting of 15 highly sensitive geophones linked to a seismic processor s.ud minicomputer on the surface. Focal coordinates of seismic events are calculated and a c o ~ u t e r disk file is maintained for reference and analysis. Rock noise is being monitored by a network of accelerometers, signals from which are stored and analysed using a minicomputer. The accelerometers are also being used in dyke detection. 774094 ROCK BURSTING IN ROMISH DEEP COAL MINES IN LIGHT OF RESEARCH AND PRAOrICAL OBS~VATION Kra~,rlec, A; Stenislaw, T Tr~us SOC Min ~igr, AIME, V262, N1, March
1977, P30-36 Minln4~ and geophysical methods of predicting aad pceventln~ ro=k btu-sts are discussed, inzludimg seismic methods, various kinds of s.hock blasting, torpedoing and In~ectlng w~ter at high pressure. 772095 MEI"~OD ~ CALCULATING THE OPTIMUM SUPPORT PARAM~r,~S ~l~ DEVEI~M~NT WORKINGS Aitmatov, I T; Baknazarov, T S So'z Min Sci, V12, N3, Ma~-June 1976, P238Discusses the slm~lest type of mathematical model of a rock which takes into account disintegration and~ bsmed on this, suggests a method of calculating the optimum support parameters, considering factors influencing the stress-strain state around the working. 77~096 STRESS.STRAIN STATE (~m SOLID COAL DURING SHIELD EfI~ACTION OF THICK INCLINED SEAMS Tomashevskll, L P; Aksenov, V K; Senko, L S Soy ~ Sci, VI2, N3, M%y-J~ue 1976, P319323 Reports measurements in 2 shield pillars at the Tsentralnsya Colliery.
77~097 INFLUENCE OF CRACKS ON STATE OF STRESS OF I"HE ROCK AROUND A MINE WORKING Sentsov, P I Soy Min Sol, V12, N3, M~v-June I~;6, P333-
336
Analyses the influence of cracks related to the stability of workings in l_:d~e rocks of medium to high hmrdness. 77£098 ASSESSMENT OF THE S'IIRESSED STATE OF MARGINAL ZONES OF CoAL SEAW~ BY ELECTRO~T-RY Tarasov, B G; Dyrdln, V V Soy Min Sol, V12, N3, M%v.Jun= 1976, F336339 Reports an investigation of 2 electrical methods: the natural potential distribution and the effective resistance dlstr~butlon, and concludes that they can be used to determine i~he mechanical stress distribution pattern in the l~edlate face zones of coal seams, but are far shorter and ~/ch less involved than existing methods. 772099 FIFTH AI/--UNION S ~ I N A R ON THE .~_ASURE~--~T OF STRESSES IN SOLID ROCK Leont ev, A Soy Min Sol, V12, N3, May.J~ne 1976, P347-
3~49 Reviews briefly som~ of the papers and reports presented at the semln~~, the proceedlngs of which are to be published sep~-ately. 77~100 ROOF DISPLACEMENT IN WORKING THICK STFL~LY DIPPING SEAMS IN THE ~JZBASS TO ~ E RISE WITH STOWIN.3 OF THE WORKED-OUT AREA Posolahovs G E; Tereshkln~ A F; Sevostyanov, V V Soy MJ_% Sol, Vl2, N2, March-Aprll 1976, PI~9-
133 Reports an inwestigatlon of the development of roof displacements daring extraction of a single laterally inclined panel, or of all the pan.-l~ worked up to the time of scheduled advance of the extraction front, in a mine on the Kuznetsk coalfield. The data ~ e intended to be used to predict rock pressure phenomena in slmilsr s it uations. 774101 METHOD FOR CALCOLATING THE DISPLAC~INT S:/RFACES OF THE WALZBOCKS IYJRING WORKING OF A COAL SEAM Grltsko, G I; Vlaser~, B V Soy Min Sci, V12, N2 Mgrch-April 1976, P13~139 Field observations of displanement increments with unit advances of the working face permit calculation of the displacement s ~ a c e of the roof dtu~ing advance of the minlng.out face. The experlmental.analytlcal method of ths authors for determining the state of stress from knovn displacements enables study of the meeh~ical state of a rock mass ~ad prediction of rock pressure. 77hi02 PREDICTION OF THE STATE OF SrR~oS OF ROCK MASSES IN THE PROSPECTING A~ND CONSTR:JC~IDN STAGES OF A MINING ENTERPRISE POpOV, S N; Kurlenya, M V Soy Min Sci, V12, N2, MSrch-April 1976, PI~0144 Discusses 2 methods for d.~termlnine_ - the complete stcess tensor, th~ first based on the use of a prospecting borehole and extra~.tion of a bore-hole wail core by drilling, the other based on the use of a mine shaft or other mine working ~ on the relief of a core from the c ~ t r a l bore-hole.
forces of sufficient magnitude for initiating and propagating fractures of depth adequate to relieve strain. Strain relief by borehole Jackfracturing was studied with finite element analysis and also by simple consideration of boundary conditions and external tractions. The dependence of the initial state of stress on the strain-relief measurema~ts at different orientations is obtained by employing the classical theory of elasticity. The instrumentation unique to the method, a borehole-loading device and a friction-straln-geuge module, were tested in the lsboratory, and the results are s,,-~q~ized. Field-stress measurements made in a ss.udstone quarry for the magnitude and orientation of the stresses are in good agrecment wlt~h those obtained by an independent overcorlng technique. 772093 ROCK BURSTS AND THE SEARCH FOR AN EARLY W.~RNING SYST~ Heunis, R Min Nag, V136, N2, Feb 1977, P83-89 S~,mm~rises the nature of gold mining operations in South Africa and goes on to discuss the rock burst research project at Western Deep Levels. An automatic seismic location system was developed, ecmsisting of 15 highly sensitive geophones linked to a seismic processor s.ud minicomputer on the surface. Focal coordinates of seismic events are calculated and a c o ~ u t e r disk file is maintained for reference and analysis. Rock noise is being monitored by a network of accelerometers, signals from which are stored and analysed using a minicomputer. The accelerometers are also being used in dyke detection. 774094 ROCK BURSTING IN ROMISH DEEP COAL MINES IN LIGHT OF RESEARCH AND PRAOrICAL OBS~VATION Kra~,rlec, A; Stenislaw, T Tr~us SOC Min ~igr, AIME, V262, N1, March
1977, P30-36 Minln4~ and geophysical methods of predicting aad pceventln~ ro=k btu-sts are discussed, inzludimg seismic methods, various kinds of s.hock blasting, torpedoing and In~ectlng w~ter at high pressure. 772095 MEI"~OD ~ CALCULATING THE OPTIMUM SUPPORT PARAM~r,~S ~l~ DEVEI~M~NT WORKINGS Aitmatov, I T; Baknazarov, T S So'z Min Sci, V12, N3, Ma~-June 1976, P238Discusses the slm~lest type of mathematical model of a rock which takes into account disintegration and~ bsmed on this, suggests a method of calculating the optimum support parameters, considering factors influencing the stress-strain state around the working. 77~096 STRESS.STRAIN STATE (~m SOLID COAL DURING SHIELD EfI~ACTION OF THICK INCLINED SEAMS Tomashevskll, L P; Aksenov, V K; Senko, L S Soy ~ Sci, VI2, N3, M%y-J~ue 1976, P319323 Reports measurements in 2 shield pillars at the Tsentralnsya Colliery.
77~097 INFLUENCE OF CRACKS ON STATE OF STRESS OF I"HE ROCK AROUND A MINE WORKING Sentsov, P I Soy Min Sol, V12, N3, M~v-June I~;6, P333-
336
Analyses the influence of cracks related to the stability of workings in l_:d~e rocks of medium to high hmrdness. 77£098 ASSESSMENT OF THE S'IIRESSED STATE OF MARGINAL ZONES OF CoAL SEAW~ BY ELECTRO~T-RY Tarasov, B G; Dyrdln, V V Soy Min Sol, V12, N3, M%v.Jun= 1976, F336339 Reports an investigation of 2 electrical methods: the natural potential distribution and the effective resistance dlstr~butlon, and concludes that they can be used to determine i~he mechanical stress distribution pattern in the l~edlate face zones of coal seams, but are far shorter and ~/ch less involved than existing methods. 772099 FIFTH AI/--UNION S ~ I N A R ON THE .~_ASURE~--~T OF STRESSES IN SOLID ROCK Leont ev, A Soy Min Sol, V12, N3, May.J~ne 1976, P347-
3~49 Reviews briefly som~ of the papers and reports presented at the semln~~, the proceedlngs of which are to be published sep~-ately. 77~100 ROOF DISPLACEMENT IN WORKING THICK STFL~LY DIPPING SEAMS IN THE ~JZBASS TO ~ E RISE WITH STOWIN.3 OF THE WORKED-OUT AREA Posolahovs G E; Tereshkln~ A F; Sevostyanov, V V Soy MJ_% Sol, Vl2, N2, March-Aprll 1976, PI~9-
133 Reports an inwestigatlon of the development of roof displacements daring extraction of a single laterally inclined panel, or of all the pan.-l~ worked up to the time of scheduled advance of the extraction front, in a mine on the Kuznetsk coalfield. The data ~ e intended to be used to predict rock pressure phenomena in slmilsr s it uations. 774101 METHOD FOR CALCOLATING THE DISPLAC~INT S:/RFACES OF THE WALZBOCKS IYJRING WORKING OF A COAL SEAM Grltsko, G I; Vlaser~, B V Soy Min Sci, V12, N2 Mgrch-April 1976, P13~139 Field observations of displanement increments with unit advances of the working face permit calculation of the displacement s ~ a c e of the roof dtu~ing advance of the minlng.out face. The experlmental.analytlcal method of ths authors for determining the state of stress from knovn displacements enables study of the meeh~ical state of a rock mass ~ad prediction of rock pressure. 77hi02 PREDICTION OF THE STATE OF SrR~oS OF ROCK MASSES IN THE PROSPECTING A~ND CONSTR:JC~IDN STAGES OF A MINING ENTERPRISE POpOV, S N; Kurlenya, M V Soy Min Sci, V12, N2, MSrch-April 1976, PI~0144 Discusses 2 methods for d.~termlnine_ - the complete stcess tensor, th~ first based on the use of a prospecting borehole and extra~.tion of a bore-hole wail core by drilling, the other based on the use of a mine shaft or other mine working ~ on the relief of a core from the c ~ t r a l bore-hole.