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Use of new types of artificial roof in the working of thick seams (in Czech)
27A
831220 USE OF NE~ TYPES OF ARTIFICIAL ROOF IN THE WOld,I -
OF T ~
~
BoI~ and anthem
(z~ CZECH)
I~mbrovsky, Z Uhli, V30, NS, 1982, P193-196 Describes the use af plastic mesh (as opposed to steel mesh) in the roofs af seams in the Ostrava-Karvina coalfield, Czechoslovakia. 831221 RATIONAL ROCKBOLT AND SHOTCREI~ SUPPORT IN FRIABLE ROCK MASS HEADINGS Wang Zhongde; Cao RuJie In: Tunnelling 82, Proceedings uf the 3rd Intarnatlomal Symposium, Brighton, 7-11 June 1982, P153-159. Publ London: D@4, 1982 A discussion is given of the defcrmation of characteristics of friable wallrock, sul~Crt effects add results obtained with grouted rockbolts add shotcrete in friable rock masses. Principles for designing rockbolt and shotcrete s u p p o r t a r e t h e n considered. By u s e o f t h e c h a r aeteristic curve method and t h e p e r i p h e r a l displacement equalization method for Ira-calculation of the long-term stability of the w~11~ock azrl the support, d ~ n a t i o n of a rational form and design p e r a m e t e r s o f systematic rockbolt and shotcrete support and local reinforcement is reviewed. Examples from actual IroJects are cited and analysed. 831222 OVERVIEW OF BUREAU OF MINES GROUND CONTROL RESEARCH Karhuak, J M Proc Ist Conference on ~ o u r ~ Corr~rol im Mining, Mcrgantcwn, 27-29 July 1981, P5966. Publ Mergantcwn: West Virginia University, 1981 Outlines the organisation, goals a~d methods of implementation of the US Bureau of Mines Ground Control research Irogramme. Examples of research IroJects are given including supports, a roof bolt tester, bolting machines, roof trusses, outburst warning studies. 831223 SZMFLE ROCK MECHANIC TOOLFOR EFFECTIVE ROOF CONTROL Pothini, R; Yon Schonfeld% H Proc ist Conference on Ground Control in Mining, M o r g ~ , 27-29 July 1981, Supplement. Publ Morgantcwn: West Virginia University, 1981 831224 EVALUATION OF ROOF TRUSSES, PHASE I Mamgelsdorf, C P US Bureau of Mines report OFR 56-82, Feb 1979, lllP The objective of this Irogram was to eval~ate a number of roof support systems that have same l~sieal s~-~larity to the t r u s s introduced by the Birmingham Bolt Co. in 1966. The r e p ~ is in two parts: Part 1 is a state-c~-~he-art study of roof truss technology as of January 1979. Included are a h l s t ~ y of the truss concept, a review of analysis techniques, a record of hardware available and equipment used in its installation, amd examples of user experience. Part 2 is concerned with a study of the role of friction in the behavlour of a reef truss.
831225 EXAMPLES OF THE USE OF KW SZ-I GLASS FI~REREINF(~ PQLYEST~ RESIN ROCK BOLTS IN COAL (IN POLISH) Twardokes, K Przegl Gown, V37, N12, Dec 1981, P~6-591 831226 CONTROILED THRUST AND TORQUE F L A C ~ T OF MECHANICAL ANCHOR BOLTS AND THEIR RELATIONSHIP TO IMPROV~ ROOF CONTROL Mahyera, A; Brest Van Kmnpen, C J H; Conway, J P Proc Ist Conference on Groumd Control in Mining~ Mer~.~'~own, 27-29 July 1981, P ~ 105. Publ Mcrgantown: West Virginia University, 1981 Describes a mew roof bolting machine able to achieve accurate roof bolting tension which will remain at an effective level fcr a considerable time. The machine minimises variability due to bolt tension decay caused by different anchor creep rates. 831227 NEW COMBINATION FRICTION-SUSPENSION S U ~ SYSTEM - SCOTT C%~TE SLINGS Scott, J J; Castle, B R Proc ist Conference on Grourd Control in Mining, Mcrgantown, 27"29 July 1981, P132" 136. Publ Murgantown: West Virginia University, 1981 Describes the Scott Cable Sling supp~=t system, a combination system featuring both interior rock reinforcement (Split Set Stabilizers) and ground suspension components (cables). The system is applicable for both r o ~ , add pillar add rib control. Field examples of its use are cited. 831228 INORGANIC CEMENT GROUTED BOLT S Y S I ~ Serbousek, M O; Bolstad, D D Proc 1st Conference on Groumd Control in Mining, Mcrgantown, 27-29 July 1981, P137l~O. Publ Morgantown: West Virginia University, 1981 Describes the development a~d testing of a ~-w inorganic cement grouted bolt system, as an alternative to organic resin grouted bolts. Two methods using inorganic cements are udder development: a cartridge system using microcapsules uf water and accelerator, add a mixinject slurry system. 831229 DEVELOPMENT OF A RESIN POINT ANCHOR Wilding, R R; Thomson, M L Proc ist Conference on Ground Control in Mining, Morgantown, 27-29 July 1981, I~i41143. Publ Mcrgantown: West Virginia University, 1981 Outlines t h e d e v e l o p m e n t o f a n a r c h e r resin fc~ resin grouted bolts. Ultimate requirements far both the bolt add the resin are listed. Problems likely to occur during installation are discussed. 831230 RESEARCH STUDY OF COAL MINE ROCK REINFORCEMENT Lamgs T A; Blsch~f, J A US Bureau uf Mimes relxrt OFR 72-82, Jan 1981, 227P
831220 USE OF NE~ TYPES OF ARTIFICIAL ROOF IN THE WOld,I -
OF T ~
~
BoI~ and anthem
(z~ CZECH)
I~mbrovsky, Z Uhli, V30, NS, 1982, P193-196 Describes the use af plastic mesh (as opposed to steel mesh) in the roofs af seams in the Ostrava-Karvina coalfield, Czechoslovakia. 831221 RATIONAL ROCKBOLT AND SHOTCREI~ SUPPORT IN FRIABLE ROCK MASS HEADINGS Wang Zhongde; Cao RuJie In: Tunnelling 82, Proceedings uf the 3rd Intarnatlomal Symposium, Brighton, 7-11 June 1982, P153-159. Publ London: D@4, 1982 A discussion is given of the defcrmation of characteristics of friable wallrock, sul~Crt effects add results obtained with grouted rockbolts add shotcrete in friable rock masses. Principles for designing rockbolt and shotcrete s u p p o r t a r e t h e n considered. By u s e o f t h e c h a r aeteristic curve method and t h e p e r i p h e r a l displacement equalization method for Ira-calculation of the long-term stability of the w~11~ock azrl the support, d ~ n a t i o n of a rational form and design p e r a m e t e r s o f systematic rockbolt and shotcrete support and local reinforcement is reviewed. Examples from actual IroJects are cited and analysed. 831222 OVERVIEW OF BUREAU OF MINES GROUND CONTROL RESEARCH Karhuak, J M Proc Ist Conference on ~ o u r ~ Corr~rol im Mining, Mcrgantcwn, 27-29 July 1981, P5966. Publ Mergantcwn: West Virginia University, 1981 Outlines the organisation, goals a~d methods of implementation of the US Bureau of Mines Ground Control research Irogramme. Examples of research IroJects are given including supports, a roof bolt tester, bolting machines, roof trusses, outburst warning studies. 831223 SZMFLE ROCK MECHANIC TOOLFOR EFFECTIVE ROOF CONTROL Pothini, R; Yon Schonfeld% H Proc ist Conference on Ground Control in Mining, M o r g ~ , 27-29 July 1981, Supplement. Publ Morgantcwn: West Virginia University, 1981 831224 EVALUATION OF ROOF TRUSSES, PHASE I Mamgelsdorf, C P US Bureau of Mines report OFR 56-82, Feb 1979, lllP The objective of this Irogram was to eval~ate a number of roof support systems that have same l~sieal s~-~larity to the t r u s s introduced by the Birmingham Bolt Co. in 1966. The r e p ~ is in two parts: Part 1 is a state-c~-~he-art study of roof truss technology as of January 1979. Included are a h l s t ~ y of the truss concept, a review of analysis techniques, a record of hardware available and equipment used in its installation, amd examples of user experience. Part 2 is concerned with a study of the role of friction in the behavlour of a reef truss.
831225 EXAMPLES OF THE USE OF KW SZ-I GLASS FI~REREINF(~ PQLYEST~ RESIN ROCK BOLTS IN COAL (IN POLISH) Twardokes, K Przegl Gown, V37, N12, Dec 1981, P~6-591 831226 CONTROILED THRUST AND TORQUE F L A C ~ T OF MECHANICAL ANCHOR BOLTS AND THEIR RELATIONSHIP TO IMPROV~ ROOF CONTROL Mahyera, A; Brest Van Kmnpen, C J H; Conway, J P Proc Ist Conference on Groumd Control in Mining~ Mer~.~'~own, 27-29 July 1981, P ~ 105. Publ Mcrgantown: West Virginia University, 1981 Describes a mew roof bolting machine able to achieve accurate roof bolting tension which will remain at an effective level fcr a considerable time. The machine minimises variability due to bolt tension decay caused by different anchor creep rates. 831227 NEW COMBINATION FRICTION-SUSPENSION S U ~ SYSTEM - SCOTT C%~TE SLINGS Scott, J J; Castle, B R Proc ist Conference on Grourd Control in Mining, Mcrgantown, 27"29 July 1981, P132" 136. Publ Murgantown: West Virginia University, 1981 Describes the Scott Cable Sling supp~=t system, a combination system featuring both interior rock reinforcement (Split Set Stabilizers) and ground suspension components (cables). The system is applicable for both r o ~ , add pillar add rib control. Field examples of its use are cited. 831228 INORGANIC CEMENT GROUTED BOLT S Y S I ~ Serbousek, M O; Bolstad, D D Proc 1st Conference on Groumd Control in Mining, Mcrgantown, 27-29 July 1981, P137l~O. Publ Morgantown: West Virginia University, 1981 Describes the development a~d testing of a ~-w inorganic cement grouted bolt system, as an alternative to organic resin grouted bolts. Two methods using inorganic cements are udder development: a cartridge system using microcapsules uf water and accelerator, add a mixinject slurry system. 831229 DEVELOPMENT OF A RESIN POINT ANCHOR Wilding, R R; Thomson, M L Proc ist Conference on Ground Control in Mining, Morgantown, 27-29 July 1981, I~i41143. Publ Mcrgantown: West Virginia University, 1981 Outlines t h e d e v e l o p m e n t o f a n a r c h e r resin fc~ resin grouted bolts. Ultimate requirements far both the bolt add the resin are listed. Problems likely to occur during installation are discussed. 831230 RESEARCH STUDY OF COAL MINE ROCK REINFORCEMENT Lamgs T A; Blsch~f, J A US Bureau uf Mimes relxrt OFR 72-82, Jan 1981, 227P