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Protection of openings without leaving coal pillars (in Polish)
82A
Temporary and permanent supports 78~ii0 DRRP-TUNNEL ROOF SUPPORTS IN THE PAST AND ~ w (IN FRENSH w m m m~LZSH ~ M ~ a Y ) D ~ f a u % P; Piratrl~ J Industrie Minerale~ Set Mine~ NI, Feb 1976 , P15-31 Reviews past experience in deep tunnels as recorded between ~ amd 19~8, amd discusses th e theoretical analysis of Egger (1973). Surveys modern methods of support, in particular roof bolting and gunite, aml discusses t h e socalled New Austrian ~mmelling Method in the light of past and modern experience. 784111 EFFECTIVENESS OF SCHAFER SI13 BOLTING FOR GI CONTOURS FROM TESTS ON MODELS (IN FRENCH) Buscbma~n, N Publ Tech Cherbon Fr, N3, June 1977, P126-127 Describes tests of the loadbearing ani deformation behsviour of rigid arches in roadways. When bolting is used~ the framework r ~ ne in its initial plane, even -~hen the convergence is 20 per cent. U ~ o l t e d frames are laterally deflected and twisted. 784112 ROOF REINFORCEMENT USING WOOD RESIN BOLTS (IN ~OLI~) Bednsrek, W; Papierz, A Wiad Gorn, Oct 1976, P305-311 Wood bolts wi~h resin along their whole length were used to reinforce the roof in a thick seam which was being takem in several cuts using hydraulic stowing. The method is being developed further. 78~iiB ELASTIC ROOF BOLTS WITH RUBBER HEADS (IN
POUSH) Pochelal, Z Przegl Gorn~ V33, NI2, Dec 1977, P546-551 Selection criteria for this type of roof bolt were determined on the basis of tests. The design of the bolts is discussed~ and an optimmn geometry of the rubber sleeve is determined. Rapidly increasing rock deformations have no effect on the work characteristics of these bolts.
7~1~
ST~Ln~ ~ D~N~iON oF A P R ~ C T ~ E COAL ~ H
OF T ~ ~ i c ~ s s mmm A ~
Kidybinski; A; Michelski~ A Przegl Gorn, V33, N12, Dec 1977, P551-558 Studies on models were used as a basis for cslculation~ by the finite element method, of stresses in weak roof rocks over a lonKwall face with protective coal benches of varying %blcknesses. The stability index is given for 3 typical coal strer~Eths. Guidelines are given for choosing the thickr~ss of the coal bench left. 784115 PROTECTION OF OPENINGS WITHOUT LEAVING COAL PVTIARs (IN POLISH) Shttlnpf~ G G; Zaldenvarg, Z Przegl Gorn, V33, Nil, Nov 1977, P~26-528 Methods used in the Kusmetz Basin are discussed. It is claimed that at 3 mines better results are obtained than with coal pillars.
7 8 ~ n 6 C O N m U ~ A T I O N OF R ~ S
w~
I~m~
~ s I N 11~
AT S T O I C c o ~ M I = (IN M S ) GaJda, B Przegl G ~ n , V33, toO, Oct 1977, ~ 5 4 ~ 5 8 D e ~ I b e s the technique of rock consolidstion usimg injected resin in tectomlcally dlsturbed zomes r u l i n g diagonally to the wQrkimg faces. The method is used in the rebuilding of roadways, and its technical effects are discussed. 784117 BE~AVIOUR OF ROOF BOLTS IN ROADWAYS AS A FUNCTION OF THE LOCATION OF THE LONGWALLFACE
(IN H~ISH) Gromysz, J; Zyzakj A Przegl Gorn, V33, NIO, Oct 1977, P471-477 The effect upon a roadway of the passage over of a lom~wall face % h r o ~ an overlying seam was investigated. Vertical displacement of r ~ masses amd of the support were measured, also the loads on bolts and roQf pressure in the roadway. Measurements were msde of roof bolt loads in gate roads as a function of distance from a ion@wall face which was beimg worked b~ means of roof caving and hydraulic stowing. The effect of tectonic disturbances is emphas: 784118 DYNAMIC EFFECTS OF BUMPS ON SUPPORTS (IN POLI~ Olaszow ski, W Arch GCrn, V21, NI, 1976, P37-6~ The causes of b ~ p s are outlineda and formul~ are given for the frequency of vibrations of roof and for the relationship between the loa bearing capacity of the suplx~ and the amplitude and frequency of the rock movements. ~S instr~nent used to measure the vibrations is described. 784119 FACTORS AFFECTIND THE LOAD CARRYING CAPACITY OF YTk~nlNG RING SUPPORTS BOdomyl, J; Benecz, I Publ Hung Min Res Inst, NI9, 1976, P53-58 Describes the use and develolxBerrb of yielding rings as roadway supports, aid discusses factors affecting the loadbearing capacity of steel segments which are clamped together and the effect of eccentric pressures produced by overlapped binding elements. An analysis is presented of the stresses induced by loading when the rings start to yield. 784120 STOWED PACKS IN STEEP, THICK SEAMS (IN RUSSI~ Ryzhkovj Y A; Gogolin, V A Ugol, V52, N6, June 1977, P27-31 Information is presented on the pattern of pressure distribt~tion on the seam and on the waste~ on the use of different pack meterials on the construction of composite packs. 784121 S H O I ~ I N G AT SL~ZERO T ~ U H E S (IN RUSSD Demlndov, V D Montazhn Spets Rab Strolt, NT, July 1977~ P: 784122 COAL PILLAR STRENGTH STUDY (THE DESIGN OF PRODUCTION PT[IARS IN COAL MINES) Pariseau, W G; Hustrulid, W A; Swanson, S R US~M OFR 166-77, July 1977, ~ 2 P Laboratory teats for unconfined compressive strength and Yottng's modulus on a large numbe~
Temporary and permanent supports 78~ii0 DRRP-TUNNEL ROOF SUPPORTS IN THE PAST AND ~ w (IN FRENSH w m m m~LZSH ~ M ~ a Y ) D ~ f a u % P; Piratrl~ J Industrie Minerale~ Set Mine~ NI, Feb 1976 , P15-31 Reviews past experience in deep tunnels as recorded between ~ amd 19~8, amd discusses th e theoretical analysis of Egger (1973). Surveys modern methods of support, in particular roof bolting and gunite, aml discusses t h e socalled New Austrian ~mmelling Method in the light of past and modern experience. 784111 EFFECTIVENESS OF SCHAFER SI13 BOLTING FOR GI CONTOURS FROM TESTS ON MODELS (IN FRENCH) Buscbma~n, N Publ Tech Cherbon Fr, N3, June 1977, P126-127 Describes tests of the loadbearing ani deformation behsviour of rigid arches in roadways. When bolting is used~ the framework r ~ ne in its initial plane, even -~hen the convergence is 20 per cent. U ~ o l t e d frames are laterally deflected and twisted. 784112 ROOF REINFORCEMENT USING WOOD RESIN BOLTS (IN ~OLI~) Bednsrek, W; Papierz, A Wiad Gorn, Oct 1976, P305-311 Wood bolts wi~h resin along their whole length were used to reinforce the roof in a thick seam which was being takem in several cuts using hydraulic stowing. The method is being developed further. 78~iiB ELASTIC ROOF BOLTS WITH RUBBER HEADS (IN
POUSH) Pochelal, Z Przegl Gorn~ V33, NI2, Dec 1977, P546-551 Selection criteria for this type of roof bolt were determined on the basis of tests. The design of the bolts is discussed~ and an optimmn geometry of the rubber sleeve is determined. Rapidly increasing rock deformations have no effect on the work characteristics of these bolts.
7~1~
ST~Ln~ ~ D~N~iON oF A P R ~ C T ~ E COAL ~ H
OF T ~ ~ i c ~ s s mmm A ~
Kidybinski; A; Michelski~ A Przegl Gorn, V33, N12, Dec 1977, P551-558 Studies on models were used as a basis for cslculation~ by the finite element method, of stresses in weak roof rocks over a lonKwall face with protective coal benches of varying %blcknesses. The stability index is given for 3 typical coal strer~Eths. Guidelines are given for choosing the thickr~ss of the coal bench left. 784115 PROTECTION OF OPENINGS WITHOUT LEAVING COAL PVTIARs (IN POLISH) Shttlnpf~ G G; Zaldenvarg, Z Przegl Gorn, V33, Nil, Nov 1977, P~26-528 Methods used in the Kusmetz Basin are discussed. It is claimed that at 3 mines better results are obtained than with coal pillars.
7 8 ~ n 6 C O N m U ~ A T I O N OF R ~ S
w~
I~m~
~ s I N 11~
AT S T O I C c o ~ M I = (IN M S ) GaJda, B Przegl G ~ n , V33, toO, Oct 1977, ~ 5 4 ~ 5 8 D e ~ I b e s the technique of rock consolidstion usimg injected resin in tectomlcally dlsturbed zomes r u l i n g diagonally to the wQrkimg faces. The method is used in the rebuilding of roadways, and its technical effects are discussed. 784117 BE~AVIOUR OF ROOF BOLTS IN ROADWAYS AS A FUNCTION OF THE LOCATION OF THE LONGWALLFACE
(IN H~ISH) Gromysz, J; Zyzakj A Przegl Gorn, V33, NIO, Oct 1977, P471-477 The effect upon a roadway of the passage over of a lom~wall face % h r o ~ an overlying seam was investigated. Vertical displacement of r ~ masses amd of the support were measured, also the loads on bolts and roQf pressure in the roadway. Measurements were msde of roof bolt loads in gate roads as a function of distance from a ion@wall face which was beimg worked b~ means of roof caving and hydraulic stowing. The effect of tectonic disturbances is emphas: 784118 DYNAMIC EFFECTS OF BUMPS ON SUPPORTS (IN POLI~ Olaszow ski, W Arch GCrn, V21, NI, 1976, P37-6~ The causes of b ~ p s are outlineda and formul~ are given for the frequency of vibrations of roof and for the relationship between the loa bearing capacity of the suplx~ and the amplitude and frequency of the rock movements. ~S instr~nent used to measure the vibrations is described. 784119 FACTORS AFFECTIND THE LOAD CARRYING CAPACITY OF YTk~nlNG RING SUPPORTS BOdomyl, J; Benecz, I Publ Hung Min Res Inst, NI9, 1976, P53-58 Describes the use and develolxBerrb of yielding rings as roadway supports, aid discusses factors affecting the loadbearing capacity of steel segments which are clamped together and the effect of eccentric pressures produced by overlapped binding elements. An analysis is presented of the stresses induced by loading when the rings start to yield. 784120 STOWED PACKS IN STEEP, THICK SEAMS (IN RUSSI~ Ryzhkovj Y A; Gogolin, V A Ugol, V52, N6, June 1977, P27-31 Information is presented on the pattern of pressure distribt~tion on the seam and on the waste~ on the use of different pack meterials on the construction of composite packs. 784121 S H O I ~ I N G AT SL~ZERO T ~ U H E S (IN RUSSD Demlndov, V D Montazhn Spets Rab Strolt, NT, July 1977~ P: 784122 COAL PILLAR STRENGTH STUDY (THE DESIGN OF PRODUCTION PT[IARS IN COAL MINES) Pariseau, W G; Hustrulid, W A; Swanson, S R US~M OFR 166-77, July 1977, ~ 2 P Laboratory teats for unconfined compressive strength and Yottng's modulus on a large numbe~