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Effect of sharp roof movements on the operation of hydraulic supports (in Russian)
differentials.
Lirmr superpositioncanbe used only far an isotropic continuum;The degree of non-linearitydeperrls on lhegeolcgicsl coditions;
ON THE OPERATION 775122 EFFECT OF SHARP ROOF XOVEMEiVTS OF HYDPAULIC SUPPORTS (IN RUSSIAN) Sadykov, NM; Orlw, A A Ugol, V52, Nl, Jan 1977, P41-44 Reports studies at 4 collieries.
Temporary and permanent supports 775118 FACE SUPPORT REY ARCHIIiG E==,I IntJ RockMechMin Pl-5
- APROBLEMIN
Scl, Vl4, Nl, Janl9j'7,
775123 FUFUREPROSPECTSOF SPRAYEDCONCRETEIN MINING UNDERGRC?JND(INGERMAN) Ruffert, G Gluckauf, vl_LZ,N21, 4 Nov 1976, P1224-1227 Discussesrequired quality of concrete,suitable equipment,rebound, dust development,addition of quick bilders, screeningcm ard meximum psrticle size, further development.
Requiranentsfar the load-bearingcharacteristics af powered suppcrtsinBritishmines havebeen 775124 CORRELATIONOF MINE ROOF FAILUREWITHTHETIME based upon observationsof losd/convergerme LAPSE BEFORE SUPPORI INSTALJ-ATION. FINAL REPORT relationshipset the face, tiewedlnthe light Cox, RM of apurelygeunetrlcslinterIsxtationofthe usBM OFR 11-77, July 1974, 80P (W 262478/A~) waylnwh&hroofstretacrumbleintothegoaf. No analysis of stress conditions at Me face has ever The objective of this study was to determine if been presented.This paper relates theory to significantrelationshipsexist between coal. the phenunena ani applies staniard equations mine roof stabilityaxxlthe time roof is left to calculatetheresidualload of u&eyed unsupported.Additionalfactors such as geology, brokenrcckwhich the supportshave to carry. openi~geanetry, animinirgmethodsware also This load proves to be closely equal to the studied.The results indicatethat geologic value which, in practice, suppcrt losds must factis such es shear zons (either joints or exceed if excessiveconvergenceis to be avoided. faults) sxl changes in roof litholo(yy were the The theory gives suppart to the current philosophy principalfactors governing mine roof stability. of support design insofar es losdi~g-bearing The time lapse factor appearal to be of critical capacity is comerned;Auth. impartazxewhen poor mine roof cotitions sre encountered.The studypointedupthe needfor 775119 DEVELOPMENTOFANEWFLEXIBLEROADSUPPORT improved and permissiblerock mechanics im.tnp CONSISTINGOF SIEEL TUBES WITH CONCRETE FILLING mentetion for use in coal mine investigations. (IN GERMAN) Dreganow,L Neue Bergbautech,Vi',N3, March 1977, P182-185 *vail: NTIS, S~ingfleld, Va, 22161, USA Utier conditionsoccurring in Bulgarian cccl mines, road supmts consistingof steel archeswithbellshaped section have proved unsatisfactoryin sane headings.A support consistingof concrete-filled steeltubeswithhingedjointsvasfourd tobe better in laboratorytests eni in trials; SUBSiDENCE 775120 EQUATION OF AFULL NON-SI'ABILISED TROWH (INPOLISH) Skirderowlcz,B Przegl Gorn, V33, N2, Feb 1977, p15-79 The profile of a full nonstabillsed subsidence trough arxlthe cme of subsidenceof egrouni point in time correspondsto the Gaussian integral curve: An equation is given for full non-stabilisedtroughsanlthedipcurvature, variationwith time of the dip of the tangent, ard rate of accelerationof subsidenceof a point on the surface. 77512l POSSIBILITIESFOR IKE APPLICATIONOF ANHYDRITE PACKIMj FOR PROI'ECTINGMNEWORKINGS (INPOLISH) Postawe, J; Mazurkiewicz,M Eesa Nauk Akad CarnHutn StanislawaStasaica, Nso>, 1976, PlO7-121 The autiors discuss sane examples of the application of -rite packing for the protection ofrosdways, drivage of twinroadways separated by a pa&w&l, initiatingof caving walls from developer& headings without using suppcrting pillars,fill&g voids in the roaf left after caving, ant packilgbehindroad suwts. The results of laboratory testing of anhydrite-ash ps&i~sre~esented,ardaprcgremeffurther research on hardened pscklrg is outlined.
775125 FIELD INVESTIGATIONOF THE PERFORMANCEOF SHOTCRETE IN UNDERGROUNDCONSI'RUCIION Jones, R A Ph D thesis, Illinois Univ, Urbana-Champaign, 1976, 371~ Ihe results of an instrumsntation.program to study the behavior of a shotcrete-rockbolt suppcrtsysteminarock tunxmalfcrthe Washington,D.C. Subwaysrepresented; Measurementsof rock deformationby the use of embedment streingaugesweremade. Mechanical red-Qpe axtensometersani streingsges, horded electrical-resistance type ard vibrating-wiretype, were emplow in two major test sections.mensaueterswere also used through the tunnel in the general obsenrationprogram, including sections supportedwith shotcrete ani steel sets. Avail: UniversityMicrofilms,18, Bedford Row, Lo&onWC!lR 4EJ, UK 775126 FIELD-ORIENTEDINVESTIGATIONOF CONVENTIONAL ANDMpERlMExrALSHOPCRBTE FORTUNNELS Parker. HW Ph D thesis, IllinoisUniv, Urbsna-Champaign, 1976, 664~ The applicationof shotcreteby the dry-&x process ani the engineeriqgproperties 09 coarse sggregate shotcrete,typicsJ.lyused for uniargrovndsupport,wereinvestigatedin detail. Conventionalshotcreteandtcroexperimental shotcretes,steel fiber shotcretes& regulated setcementshotcretewere testeclun8argrouni successfullyusing typicalcrews anl equipment..
Lirmr superpositioncanbe used only far an isotropic continuum;The degree of non-linearitydeperrls on lhegeolcgicsl coditions;
ON THE OPERATION 775122 EFFECT OF SHARP ROOF XOVEMEiVTS OF HYDPAULIC SUPPORTS (IN RUSSIAN) Sadykov, NM; Orlw, A A Ugol, V52, Nl, Jan 1977, P41-44 Reports studies at 4 collieries.
Temporary and permanent supports 775118 FACE SUPPORT REY ARCHIIiG E==,I IntJ RockMechMin Pl-5
- APROBLEMIN
Scl, Vl4, Nl, Janl9j'7,
775123 FUFUREPROSPECTSOF SPRAYEDCONCRETEIN MINING UNDERGRC?JND(INGERMAN) Ruffert, G Gluckauf, vl_LZ,N21, 4 Nov 1976, P1224-1227 Discussesrequired quality of concrete,suitable equipment,rebound, dust development,addition of quick bilders, screeningcm ard meximum psrticle size, further development.
Requiranentsfar the load-bearingcharacteristics af powered suppcrtsinBritishmines havebeen 775124 CORRELATIONOF MINE ROOF FAILUREWITHTHETIME based upon observationsof losd/convergerme LAPSE BEFORE SUPPORI INSTALJ-ATION. FINAL REPORT relationshipset the face, tiewedlnthe light Cox, RM of apurelygeunetrlcslinterIsxtationofthe usBM OFR 11-77, July 1974, 80P (W 262478/A~) waylnwh&hroofstretacrumbleintothegoaf. No analysis of stress conditions at Me face has ever The objective of this study was to determine if been presented.This paper relates theory to significantrelationshipsexist between coal. the phenunena ani applies staniard equations mine roof stabilityaxxlthe time roof is left to calculatetheresidualload of u&eyed unsupported.Additionalfactors such as geology, brokenrcckwhich the supportshave to carry. openi~geanetry, animinirgmethodsware also This load proves to be closely equal to the studied.The results indicatethat geologic value which, in practice, suppcrt losds must factis such es shear zons (either joints or exceed if excessiveconvergenceis to be avoided. faults) sxl changes in roof litholo(yy were the The theory gives suppart to the current philosophy principalfactors governing mine roof stability. of support design insofar es losdi~g-bearing The time lapse factor appearal to be of critical capacity is comerned;Auth. impartazxewhen poor mine roof cotitions sre encountered.The studypointedupthe needfor 775119 DEVELOPMENTOFANEWFLEXIBLEROADSUPPORT improved and permissiblerock mechanics im.tnp CONSISTINGOF SIEEL TUBES WITH CONCRETE FILLING mentetion for use in coal mine investigations. (IN GERMAN) Dreganow,L Neue Bergbautech,Vi',N3, March 1977, P182-185 *vail: NTIS, S~ingfleld, Va, 22161, USA Utier conditionsoccurring in Bulgarian cccl mines, road supmts consistingof steel archeswithbellshaped section have proved unsatisfactoryin sane headings.A support consistingof concrete-filled steeltubeswithhingedjointsvasfourd tobe better in laboratorytests eni in trials; SUBSiDENCE 775120 EQUATION OF AFULL NON-SI'ABILISED TROWH (INPOLISH) Skirderowlcz,B Przegl Gorn, V33, N2, Feb 1977, p15-79 The profile of a full nonstabillsed subsidence trough arxlthe cme of subsidenceof egrouni point in time correspondsto the Gaussian integral curve: An equation is given for full non-stabilisedtroughsanlthedipcurvature, variationwith time of the dip of the tangent, ard rate of accelerationof subsidenceof a point on the surface. 77512l POSSIBILITIESFOR IKE APPLICATIONOF ANHYDRITE PACKIMj FOR PROI'ECTINGMNEWORKINGS (INPOLISH) Postawe, J; Mazurkiewicz,M Eesa Nauk Akad CarnHutn StanislawaStasaica, Nso>, 1976, PlO7-121 The autiors discuss sane examples of the application of -rite packing for the protection ofrosdways, drivage of twinroadways separated by a pa&w&l, initiatingof caving walls from developer& headings without using suppcrting pillars,fill&g voids in the roaf left after caving, ant packilgbehindroad suwts. The results of laboratory testing of anhydrite-ash ps&i~sre~esented,ardaprcgremeffurther research on hardened pscklrg is outlined.
775125 FIELD INVESTIGATIONOF THE PERFORMANCEOF SHOTCRETE IN UNDERGROUNDCONSI'RUCIION Jones, R A Ph D thesis, Illinois Univ, Urbana-Champaign, 1976, 371~ Ihe results of an instrumsntation.program to study the behavior of a shotcrete-rockbolt suppcrtsysteminarock tunxmalfcrthe Washington,D.C. Subwaysrepresented; Measurementsof rock deformationby the use of embedment streingaugesweremade. Mechanical red-Qpe axtensometersani streingsges, horded electrical-resistance type ard vibrating-wiretype, were emplow in two major test sections.mensaueterswere also used through the tunnel in the general obsenrationprogram, including sections supportedwith shotcrete ani steel sets. Avail: UniversityMicrofilms,18, Bedford Row, Lo&onWC!lR 4EJ, UK 775126 FIELD-ORIENTEDINVESTIGATIONOF CONVENTIONAL ANDMpERlMExrALSHOPCRBTE FORTUNNELS Parker. HW Ph D thesis, IllinoisUniv, Urbsna-Champaign, 1976, 664~ The applicationof shotcreteby the dry-&x process ani the engineeriqgproperties 09 coarse sggregate shotcrete,typicsJ.lyused for uniargrovndsupport,wereinvestigatedin detail. Conventionalshotcreteandtcroexperimental shotcretes,steel fiber shotcretes& regulated setcementshotcretewere testeclun8argrouni successfullyusing typicalcrews anl equipment..