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Investigation of new materials and constructions for road supports in Bulgarian mines (in German)
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bined support system analogous to that used in the New Austrian Tumr~lling Method. The support system is considered to be better than that provided by conventional arches. 796121 SUPPORT RESISTANCE AND ITS TRANSMISSION TO
n~LZSH) Ratz, B W Gluckauf, Vll4, NI, 5 Jan 1978, P9-12 (English text: P£-6) Discusses the calculation of support resistance by usimg moment equations. The magnitude ani position of the resultant support resistances are determined by the dimensions of the support components. The results of lab tests on different types of shield are reported. The effects of smooth unbroken roofs and of roof irregularities are considered briefly. 79612~ DEVELOPMENT AND USE OF ROADWAY SUPPORTS FOR
DZFFZCULT GEaMECHANZCAn CONDZ'HONS IN Ponis~
coAL ~z~s (IN OEm~) Raczynski, A Neue Bergbautech, VS, 118, Aug 1978, P452~56 Supports can be chosen on the basis of t h e rock index, which takes into account t h e effective rock strength, the specific rock mass, d e p t h , azzl s t r e s s e s depending on t h e r o a d shape, The a u t h o r d i s c u s s e s y i e l d i n g and rigid arches, yi~!d~ng and rigid frame supports and fibreglass strata bolts for use where the bolt will be cut by a shearer or dinting machine. Concrete rings of six precaat segments with a deformable material between them are being developed. 796123 INVESTIGATION OF NEW MATERIALS AND CONSTRUCTIONS FOR ROAD SUPPORTS IN BULGARIAN MINES (IN GERMAN) Draganow, L Neue Bergbautech, vS, N6, June 1978, P340-
796126 EFFECTIVE LINING BETWEEN SUPPORTS (IN RUSSIAN) Trushln, V S; Malygina, V L Shakhtnoe Stroit, N~, April 1978, P19 In the Cheiiabinsk Coalfield, a lining has been used successfully which consists of metal mesh to which a flbreglass, polymer-lmpregmated textile material is applied. The polymer coating is a bakelite or urea-formaldehyde resin. This type of lining is preferred to the use of reinforced concrete cover boards. ~ AI:~ICATION OF A ~ Z 0 M 796127 i~a~mrE~CES w ~ R00; ~ R T S AND s z ~ x - m n x m ~ com:~ims IN Tm~ ROa~ AND P!U.A~ WO~
~GAR.n~m) Here sl, J Bar~asz Kohasz Lapok: Bar~asz, VllO, NS, May 1977, P297-301 796128 DESIGN ASPECTS OF BARRIER PILLARS AGAINST WATERLOGGED WORKINGS IN COAL MINING OPERATIONS Whittaker, B N; Singh, R N In: Proc World Congress on Water in Miming and Undergroumd Works (SIAMOS-78), Granada, Spain, 18-22 Sept 1978, V1, P675-692° Publ Granada: Asoclacion Naclomal de Ingenleros de Minas, 1978 Discusses induced strata pressure loading and t h e development of fracture zones in rib pillars. R e l ~ s an investigation of in situ flow properties, permeability coefficient, and t h e effect of pillar size on long term stability in relation to prevention of water seepage. 796129 I N S T A L ~ I O N AND DESIGN GUIDELINES FOR CABLE DOWEL GROUND SUPPORT AT ZC/NBHC Hunt, R E B; Askew, J E Paper to Underground Operators Conference, Australia, 1977, Pl13-122. Publ: Parkville, Australasian Institute of Mining and Metalluray, 1977
3~ Reviews developments in t h e use of concrete, steel and reinforced concrete. Various materials for filling small gaps between precast concrete supports and the roof have been tested, and the bearing surfaces of concrete supports have been improved by the use of anchored steel plates. These ne~ materials and new methods of construction increase the initial bearing capacity of supports. U n N G S FO~ m m - 79612~ ~m,~o~s OF mSZGNING ~ ~xNG ~OADW~S O R Z v ~ Z~ ~mAK ~ K (IN reLiSh) MateJa, J Przegl Gorn, V ~ , NI2, Dec 1978, P526-531 Shows how to design curved, sprayed linings which adhere strongly to the rock. The principles of the new Austrian tura%elling method are used. 7961z5 I ~ % ~ c ~ . ~ S m ~ A ~ I O N OF ~ c ~ s oN ~m c o ~ s s ~ oF F~_~TNG ~ s corn TAnaNG A mOPOm'ION OF ~ m STOLON w~sz~ (I~ POnzSH) Mazurklewlcz, M Gornlctwo, V2, N~, 1978, P287-295
Groundwater problems See a l s o : 796209
796130 D..'.'a~MINATIONOF CERTAIN GEOI~CHNICAL AND HYDROG E O U ~ I C ~ PiRAnha, S TO AS~SS WATER FOR SEAP~S (IN POLISH) Glinko, H; Bromek, T Prace Glownego Ins% Gorn, Komunlkat N693, 1978, lIP 796131 SHAFT SINKING UNDER DIFFICULT HYDROLOGIC CONDITIONS (IN RUSSL~) Dobrovolskll, G B Shakhtnoe Stroit N6, Jtune 1978, P9-12 It is possible to avoid ground freezing when sinking shafts through rocks containing a moderate a n ~ of water by reducing the water level befcre or during sinking. The author examines the precautions which must be taken to avoid destruction of the shaft lining after settlement of the ground drained and bored through, which can reach several meters. The method can be used where 40-60cu ~ h o u r of water could e n t e r t h e shaft.
bined support system analogous to that used in the New Austrian Tumr~lling Method. The support system is considered to be better than that provided by conventional arches. 796121 SUPPORT RESISTANCE AND ITS TRANSMISSION TO
n~LZSH) Ratz, B W Gluckauf, Vll4, NI, 5 Jan 1978, P9-12 (English text: P£-6) Discusses the calculation of support resistance by usimg moment equations. The magnitude ani position of the resultant support resistances are determined by the dimensions of the support components. The results of lab tests on different types of shield are reported. The effects of smooth unbroken roofs and of roof irregularities are considered briefly. 79612~ DEVELOPMENT AND USE OF ROADWAY SUPPORTS FOR
DZFFZCULT GEaMECHANZCAn CONDZ'HONS IN Ponis~
coAL ~z~s (IN OEm~) Raczynski, A Neue Bergbautech, VS, 118, Aug 1978, P452~56 Supports can be chosen on the basis of t h e rock index, which takes into account t h e effective rock strength, the specific rock mass, d e p t h , azzl s t r e s s e s depending on t h e r o a d shape, The a u t h o r d i s c u s s e s y i e l d i n g and rigid arches, yi~!d~ng and rigid frame supports and fibreglass strata bolts for use where the bolt will be cut by a shearer or dinting machine. Concrete rings of six precaat segments with a deformable material between them are being developed. 796123 INVESTIGATION OF NEW MATERIALS AND CONSTRUCTIONS FOR ROAD SUPPORTS IN BULGARIAN MINES (IN GERMAN) Draganow, L Neue Bergbautech, vS, N6, June 1978, P340-
796126 EFFECTIVE LINING BETWEEN SUPPORTS (IN RUSSIAN) Trushln, V S; Malygina, V L Shakhtnoe Stroit, N~, April 1978, P19 In the Cheiiabinsk Coalfield, a lining has been used successfully which consists of metal mesh to which a flbreglass, polymer-lmpregmated textile material is applied. The polymer coating is a bakelite or urea-formaldehyde resin. This type of lining is preferred to the use of reinforced concrete cover boards. ~ AI:~ICATION OF A ~ Z 0 M 796127 i~a~mrE~CES w ~ R00; ~ R T S AND s z ~ x - m n x m ~ com:~ims IN Tm~ ROa~ AND P!U.A~ WO~
~GAR.n~m) Here sl, J Bar~asz Kohasz Lapok: Bar~asz, VllO, NS, May 1977, P297-301 796128 DESIGN ASPECTS OF BARRIER PILLARS AGAINST WATERLOGGED WORKINGS IN COAL MINING OPERATIONS Whittaker, B N; Singh, R N In: Proc World Congress on Water in Miming and Undergroumd Works (SIAMOS-78), Granada, Spain, 18-22 Sept 1978, V1, P675-692° Publ Granada: Asoclacion Naclomal de Ingenleros de Minas, 1978 Discusses induced strata pressure loading and t h e development of fracture zones in rib pillars. R e l ~ s an investigation of in situ flow properties, permeability coefficient, and t h e effect of pillar size on long term stability in relation to prevention of water seepage. 796129 I N S T A L ~ I O N AND DESIGN GUIDELINES FOR CABLE DOWEL GROUND SUPPORT AT ZC/NBHC Hunt, R E B; Askew, J E Paper to Underground Operators Conference, Australia, 1977, Pl13-122. Publ: Parkville, Australasian Institute of Mining and Metalluray, 1977
3~ Reviews developments in t h e use of concrete, steel and reinforced concrete. Various materials for filling small gaps between precast concrete supports and the roof have been tested, and the bearing surfaces of concrete supports have been improved by the use of anchored steel plates. These ne~ materials and new methods of construction increase the initial bearing capacity of supports. U n N G S FO~ m m - 79612~ ~m,~o~s OF mSZGNING ~ ~xNG ~OADW~S O R Z v ~ Z~ ~mAK ~ K (IN reLiSh) MateJa, J Przegl Gorn, V ~ , NI2, Dec 1978, P526-531 Shows how to design curved, sprayed linings which adhere strongly to the rock. The principles of the new Austrian tura%elling method are used. 7961z5 I ~ % ~ c ~ . ~ S m ~ A ~ I O N OF ~ c ~ s oN ~m c o ~ s s ~ oF F~_~TNG ~ s corn TAnaNG A mOPOm'ION OF ~ m STOLON w~sz~ (I~ POnzSH) Mazurklewlcz, M Gornlctwo, V2, N~, 1978, P287-295
Groundwater problems See a l s o : 796209
796130 D..'.'a~MINATIONOF CERTAIN GEOI~CHNICAL AND HYDROG E O U ~ I C ~ PiRAnha, S TO AS~SS WATER FOR SEAP~S (IN POLISH) Glinko, H; Bromek, T Prace Glownego Ins% Gorn, Komunlkat N693, 1978, lIP 796131 SHAFT SINKING UNDER DIFFICULT HYDROLOGIC CONDITIONS (IN RUSSL~) Dobrovolskll, G B Shakhtnoe Stroit N6, Jtune 1978, P9-12 It is possible to avoid ground freezing when sinking shafts through rocks containing a moderate a n ~ of water by reducing the water level befcre or during sinking. The author examines the precautions which must be taken to avoid destruction of the shaft lining after settlement of the ground drained and bored through, which can reach several meters. The method can be used where 40-60cu ~ h o u r of water could e n t e r t h e shaft.