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Rock boring machinery
227A
2251 ORCHARD, PJ ~L7 ~N, WS Time dependence in m l n ~ subsidence. In Mirersls arzl the enviromment, Paper 26. Figs,Refs. INSTN .MIN.METALL. 1974,17P. S~atu%oz-j obligations upon the N.C.B. in relation to the surface settlements that occur in minirg areas are reviewed. An essential problem is to distimguish between settlement that is due to mining and that which has other causes. Consequently, an attempt is made to define the nature and size of post-minin¢ subsidence h a v i ~ regard tO the depth of mining~ the layout~ the rature of the strata and the sequence of miming. Examples show the measured residual effects under differing circumstances. 2252 KING, HJ WHITTAKER, BN SHADBOLT, CH Effects of mining subsidence on surface structures. In Minerals and the envirorm~nt, Paper 25. Fi~s. Tabls,Ref s. INSTN.MIN.METALL. 1974, 26P. Examples given show how a subsidence wave can l~rOduce differing effects on a structure, dependi~ on the spatial relationship between the structure ~ the subsidence wave. A description is given of meas%~ements taken to ascertain the effects produced in ard around buildlr~s that were completely ur~ermined a~l when precautionary measures involved the use of trenches to obtain (a) isolation of points of the buildiz~z az~ (b) the deflection of the effects of strain into zones ad~oint to the units. The effectiveness of this method is discussed in detail~ especially in combating the effects of curvature. Thereafter, the ~eneral criteria important in the design of surface structures in mining areas are discussed ar~ conclusions are drawn. Auth.
2253 SMITH, DB Mine roof support. Patent. UK PATENT NO 1,352,154.FLETCHER SIFIL~IFFE WILD LTD.,
NOV.25TH 1970,MAY 8TH 197~. A spring steel pro.lection extends from the base of a first support and is engagedby a lever on a second support to prevent the first suppor~ toppliDR on an incline~
the rocks aurroumding a thick steeply dipping seam. 2F,1T, 4R. SOVIET MIN. SCI .Vg, N2, MAR-APR .1973, P224- 226. The ~O~-4 mechanized support work=i== in combir~tion with a cutter-loader and a machine for assembling %he flexible canopy for the s y s ~ has been tested. Observations on roof displacements were ma~e and the loads on the support were measured by MPV-66 ~ecc~ders. T~e results enable the estimation of the influence of partial loss of seal in %he hy~rattlic props on their interaction with the wall rocks. Two equations are given which can be used to make a ~relimirmry calculation of the displacements and expected loads on the supports.
2256 TOMASHEVSKII,LP SHCHERBAKOV, LA SHEPELEV, MV The stress-atraln state of coal pillars under sup~ canopies. 3F, gR. SOVIET MIN. SCI.Vg, N2,MAR-AER.1973, P216- 220. Investigations were carried out in three extraction zones worked by the shield system in coal mines of the Prokopevskugol group to determine the stress-strain zones of weakness. By measuring the pressure cf the caved rocks on the support canopy it was fotu~ ~ the maximum load occurred in the middle of the ahleld. Contours were drawn giving the compressive s t r e ~ of the coal over the cross section of the s t ~ pillars. 2257 MISRA, GB INDIAN I N S L TECHNC~. KHARAGPUR, IRD Model studies on the resistance of airways s u ~ e d with round timber sets. Technical note. 3F,4R. TRANS. S0C .MIN .EN~RS. AIME, V2 56, N2, JUNE, 1974, PlOl-102. 2258 SUBRAMANIAN, RV AUSTIN, H RAFF, RA Mine roof reinforcement by specifically designed epoxy resin systems. 8F. US BUR.MINES, RI 7907,1974,14P. The use nf polymers for rock borzling amd to reinforce coal mine structures was investigated by the B1~eau of Mines. The techniques used to achieve support are d e r cribed. Several types of resin systems were tested in the Iaboratory stud the epoxy resins were considered to be most easily modified for rock injection. Several field tests using this support system are reported.
Temporary and permanent supports See also abstract: 2322,
225~ BARR, BI DELPAK, R Prediction of ground movement in areas of minority st~bsid ene e. 12F, IT, 3R. HIGHWAY ENGR .V21, N6, JUNE, 1974, PIS- 22,36 • This p~per discusses the estimation of surface strains and deflections caused as an immediate resttlt of longwall mining. The Pal~r describes the Slms-Bridle method of predicting displacements. Three ~al~hs, one of which is the well-known relationship between the percentage of maximum subsidence anl the widt~depth ratio of a coal seam are l~esented. When used conjointly they give values of vertical settlement, horizontal displacement, ground strain and grouni rotations caused as a result of mining operations. Sample calculations are included in the paper. A computer solution to the problem is also presented ar~ the c~nputer results obtained compare favourably with the values obtained in the sample calculations.
2255 KOVRIZHIN,AK YAKOVLEV,SP FIRSOV, VP Interaction between GKK-4 mechanized suppcrts and
Construction methods 2259 PATENT Rock boring machinery. Patent. UK PATENT N0.1,352,~ 7. ANSL0 CONSDL]DATED INVESTMENT CO.LTD.,JULY qlST 1970,MAY 8TH 1974. A mobile and lightweight rock tunmellimg machine ham cutting rotors with ~utting h ~ m m ~ s mc~xfced for independent rotation on a rotatable drive shaft.
226o TAIT, A NAT.COAL BOARD, DONCASI~R, GB Some aspects of structural engineering in the Mining Industry. 13F. MIN.TECHNOL.V56, N643,MAY, 1974, P178-187. General aspects of structural e ~ g i n e ~ i ~ within %he minir~ industry and in particular some of the design and construction problems which have caused failures are discussed in this paper. 2261 JONES, JR POST, BASHFCRD ASSOC. UKIAHt CALIF. USA Raise stoping-novel underground method combini:X new and old techniques. 2F. ENGNG .MIN.J .V175, N6, JUNE, 1974, PI21-123. Raise-stoping - longhole drillirg in raises from a ausperr
2251 ORCHARD, PJ ~L7 ~N, WS Time dependence in m l n ~ subsidence. In Mirersls arzl the enviromment, Paper 26. Figs,Refs. INSTN .MIN.METALL. 1974,17P. S~atu%oz-j obligations upon the N.C.B. in relation to the surface settlements that occur in minirg areas are reviewed. An essential problem is to distimguish between settlement that is due to mining and that which has other causes. Consequently, an attempt is made to define the nature and size of post-minin¢ subsidence h a v i ~ regard tO the depth of mining~ the layout~ the rature of the strata and the sequence of miming. Examples show the measured residual effects under differing circumstances. 2252 KING, HJ WHITTAKER, BN SHADBOLT, CH Effects of mining subsidence on surface structures. In Minerals and the envirorm~nt, Paper 25. Fi~s. Tabls,Ref s. INSTN.MIN.METALL. 1974, 26P. Examples given show how a subsidence wave can l~rOduce differing effects on a structure, dependi~ on the spatial relationship between the structure ~ the subsidence wave. A description is given of meas%~ements taken to ascertain the effects produced in ard around buildlr~s that were completely ur~ermined a~l when precautionary measures involved the use of trenches to obtain (a) isolation of points of the buildiz~z az~ (b) the deflection of the effects of strain into zones ad~oint to the units. The effectiveness of this method is discussed in detail~ especially in combating the effects of curvature. Thereafter, the ~eneral criteria important in the design of surface structures in mining areas are discussed ar~ conclusions are drawn. Auth.
2253 SMITH, DB Mine roof support. Patent. UK PATENT NO 1,352,154.FLETCHER SIFIL~IFFE WILD LTD.,
NOV.25TH 1970,MAY 8TH 197~. A spring steel pro.lection extends from the base of a first support and is engagedby a lever on a second support to prevent the first suppor~ toppliDR on an incline~
the rocks aurroumding a thick steeply dipping seam. 2F,1T, 4R. SOVIET MIN. SCI .Vg, N2, MAR-APR .1973, P224- 226. The ~O~-4 mechanized support work=i== in combir~tion with a cutter-loader and a machine for assembling %he flexible canopy for the s y s ~ has been tested. Observations on roof displacements were ma~e and the loads on the support were measured by MPV-66 ~ecc~ders. T~e results enable the estimation of the influence of partial loss of seal in %he hy~rattlic props on their interaction with the wall rocks. Two equations are given which can be used to make a ~relimirmry calculation of the displacements and expected loads on the supports.
2256 TOMASHEVSKII,LP SHCHERBAKOV, LA SHEPELEV, MV The stress-atraln state of coal pillars under sup~ canopies. 3F, gR. SOVIET MIN. SCI.Vg, N2,MAR-AER.1973, P216- 220. Investigations were carried out in three extraction zones worked by the shield system in coal mines of the Prokopevskugol group to determine the stress-strain zones of weakness. By measuring the pressure cf the caved rocks on the support canopy it was fotu~ ~ the maximum load occurred in the middle of the ahleld. Contours were drawn giving the compressive s t r e ~ of the coal over the cross section of the s t ~ pillars. 2257 MISRA, GB INDIAN I N S L TECHNC~. KHARAGPUR, IRD Model studies on the resistance of airways s u ~ e d with round timber sets. Technical note. 3F,4R. TRANS. S0C .MIN .EN~RS. AIME, V2 56, N2, JUNE, 1974, PlOl-102. 2258 SUBRAMANIAN, RV AUSTIN, H RAFF, RA Mine roof reinforcement by specifically designed epoxy resin systems. 8F. US BUR.MINES, RI 7907,1974,14P. The use nf polymers for rock borzling amd to reinforce coal mine structures was investigated by the B1~eau of Mines. The techniques used to achieve support are d e r cribed. Several types of resin systems were tested in the Iaboratory stud the epoxy resins were considered to be most easily modified for rock injection. Several field tests using this support system are reported.
Temporary and permanent supports See also abstract: 2322,
225~ BARR, BI DELPAK, R Prediction of ground movement in areas of minority st~bsid ene e. 12F, IT, 3R. HIGHWAY ENGR .V21, N6, JUNE, 1974, PIS- 22,36 • This p~per discusses the estimation of surface strains and deflections caused as an immediate resttlt of longwall mining. The Pal~r describes the Slms-Bridle method of predicting displacements. Three ~al~hs, one of which is the well-known relationship between the percentage of maximum subsidence anl the widt~depth ratio of a coal seam are l~esented. When used conjointly they give values of vertical settlement, horizontal displacement, ground strain and grouni rotations caused as a result of mining operations. Sample calculations are included in the paper. A computer solution to the problem is also presented ar~ the c~nputer results obtained compare favourably with the values obtained in the sample calculations.
2255 KOVRIZHIN,AK YAKOVLEV,SP FIRSOV, VP Interaction between GKK-4 mechanized suppcrts and
Construction methods 2259 PATENT Rock boring machinery. Patent. UK PATENT N0.1,352,~ 7. ANSL0 CONSDL]DATED INVESTMENT CO.LTD.,JULY qlST 1970,MAY 8TH 1974. A mobile and lightweight rock tunmellimg machine ham cutting rotors with ~utting h ~ m m ~ s mc~xfced for independent rotation on a rotatable drive shaft.
226o TAIT, A NAT.COAL BOARD, DONCASI~R, GB Some aspects of structural engineering in the Mining Industry. 13F. MIN.TECHNOL.V56, N643,MAY, 1974, P178-187. General aspects of structural e ~ g i n e ~ i ~ within %he minir~ industry and in particular some of the design and construction problems which have caused failures are discussed in this paper. 2261 JONES, JR POST, BASHFCRD ASSOC. UKIAHt CALIF. USA Raise stoping-novel underground method combini:X new and old techniques. 2F. ENGNG .MIN.J .V175, N6, JUNE, 1974, PI21-123. Raise-stoping - longhole drillirg in raises from a ausperr