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Investigations into the safety of the railway line against ground movement due to excavation of two thick seams in India
95A
815127 ~TMINATION OF RIB PILLARS BETWEEN ADJACENT LONGWALL COALFACES Smart, B G D; Isaac, A K; Cart, P A Proc 21st US Symposium on Rock Mechanics, Rolla, Missouri, 28-30 May 1980, P319-331 Reports field trials at 2 coal mines in South Wales, ~ , of the eliminetion of rib pillars in both a full advance layout u s i ~ arch profile g~teroads ani a full retreat system with r e c t a ~ a r profile gatero~is. Discusses results in terms of gateroa~ deformation a~i su~part requirements. 815128 I~VESTIGAT~ONS INTO THE SAFETY CF THE RAILWAY LINE AGAINST GROUND MOVEMENT DUE TO EXCAVATION OF TWO THICK SEAMS IN INDIA Saxem, N C; S i ~ , B Pro~ 21st US Symposium on Rock Mechanics, Rolls, Missouri, 28-30 May 1980, P3~5-35~ Describes coal extraction methods in a lor~wall mime b e n e a t h a railway line and the surface subsiderne mo~itcri~ system. 815129 ~ S OF V~RY LARGE DEFOliaTiONS IN 'POTASH SALT' IN CONJUNCTION WITH AN ONGOING MINING OPERATION Sattler, A R; Christensen, C L Proc 21st US Symposium on Rock Mechanics, Rolla, Missouri, 28-30 May 1980, P~85-~9~ Describes room ami pillar d e f ~ t i o n measurement in a potash mine with a high extraction ratio; Two separate room pillar complexes were instrumented. In the first ccc~le~, floor-ceiling defarmations of al~m~c~m~tely I inc~day and pillar deformations aroumd i/2 imc~day were measured. In the secomd Caml~lex, In~..nentation was installed while the pillar was a part of a lot6 wall. Due to severe deformations encountered instrumentation had to be developed ~r modified fc~ these measurements. This ~al~r concentrates on experiment deslgn, design of special instrumentation amd field installation of eqtti~ment. 815130 GROUND CONTROL INVESTIGATIONS FOR ASSESSMENT OF ROOF CONDITIONS IN COAL MINES Bieniawakl, Z T; Newman, D A Proc Zlst US Symposium on Rock Mechandcs, Rolls, Missouri, 28-30 May 1980, P691-700 Reports diamond care drilllmg, borescope observation, bc~ehole and core lo6glng , amd geological mappi~ studies of roof cor~Itlons in 2 coal mines. Lab tests include uniaxlal c~p, essive strer~th, tensile strength, point load strength index, NUB cone indenter index, a~i slake durability inde~. Roof fall data from 2 mines enabled c o r r e l a t i o n b e t w e e n t h e roof s p a n and t h e s t a n d - u p t~me. The r o o f c o m d i t i o n s w e r e interpreted By means of emglneering rock mass classification systems. It was founi that the roof quality could be effectively assessed by the Gecmechanics Classification of rock masses. Improvements in the procedures fcr evaluatimg mine roof conditions are suggested. 68 refs. 815131 INFLUENCE OF STRATA CONTROL PARAM~,'~RS ON I~NGWAI.L MINING DESIGN Ura-~g, K F; Szwilskl, A B Proc 21st US Symposium on Rock Mechanics, Rolla, Missouri, 28"30 May 1980, I~20-728
Discusses a system of classlfyi~g the roof conditions from which a Roc~ ~ 1 1 t y Index may b e d e t e r m i n e d add u s e d a s a p a r a m e t e r f o r decldi~ the feasibility of loz~wall mini~j also the influence of the roof caving characteristics on the loading parameters at the coal face. A method to determine the req~ttred face advamce for the first cave of the gob is givmn. Fi~11y, criteria far the coal face s ~ c ~ t requirements are outlined.
815132 STRUCTURAL APPROACH TO SHAFT DESIGN FCR E~EP MINES IN HARD ROCK Beus, M J; ~A., S S M Proc 21st US Symposium on Rock Me-hamlcs, Rolla, Missouri, 28-30 May 1980, P780-786 Describes shaft design studies in the Coeur d'Alene m~n1~g district Of northern Idaho. Physical p r o p e r t y d a t a o f the mine r o c k s and in sltu ~tresses from sites at various depths are used as input to flnite-element models. A~lysis of the shaft stability urger various rock mass conditions, the type a~i dimension of the shaft suplxrts, proper orientation of the shaft, if other than circular, and the best time fc~ installation of per,~-mnt support are prime design considerations studied. An illustration is given to show a Prol~sed design procedure u s i ~ actual data frcm ore of the test sites. The structural aspects of circular and rectangular shafts are compered using concrete lining, timber, ani steel sets for support.
Tunnels See also: 815116, 815238 815133 JAPANESE TUNNEL DESIGN: LESSONS FOR THE US Paulson, B C Civ Emgmg, NY, VSI, N3, March 1981, P51-53 Discusses ~recast concrete tunnel liners, slurry shield tunrellimg a earth l~ress~e balanced shield, cut-and-cover Ja1~me~e style (nondisruptive excavation).
8151~ ~
IN ACTION Richardson, M; Scrt~y a J Tunn T-nnlg, VI3, N~, May 1981, P29-33
See item 815136 for an introduction to the system. The article describes l ~ r e l i ~ tests on the system of bladders (air hose used as tcroidal flat Jacks) and discusses specialist equipment necessary and its use in a trial in Gloucestershire, UK, where a 26m lomg, 1.8m diameter culvert was driven through an embankment with i. 5m of cover above the tunnel crown. No significant settlement ar loz~Itudlnal moveme~ of the grotmd was observed. 815135 OVERCOMINg; SqJEEZIEK) PRESSURES IN INDIA'S GXRI-RATA TUNNEL Dube, A K; Singh, B Tunn Tunnlg, VI3, N3, April 1981, PII-13 Discusses the excavation of a 3.6 m diameter pressure tunnel in squeezing grouni ani the use of flexible back-packlng between the rock ani the steel supports to overccme the problem. The method is not proved for highly dilati~ rock.
815127 ~TMINATION OF RIB PILLARS BETWEEN ADJACENT LONGWALL COALFACES Smart, B G D; Isaac, A K; Cart, P A Proc 21st US Symposium on Rock Mechanics, Rolla, Missouri, 28-30 May 1980, P319-331 Reports field trials at 2 coal mines in South Wales, ~ , of the eliminetion of rib pillars in both a full advance layout u s i ~ arch profile g~teroads ani a full retreat system with r e c t a ~ a r profile gatero~is. Discusses results in terms of gateroa~ deformation a~i su~part requirements. 815128 I~VESTIGAT~ONS INTO THE SAFETY CF THE RAILWAY LINE AGAINST GROUND MOVEMENT DUE TO EXCAVATION OF TWO THICK SEAMS IN INDIA Saxem, N C; S i ~ , B Pro~ 21st US Symposium on Rock Mechanics, Rolls, Missouri, 28-30 May 1980, P3~5-35~ Describes coal extraction methods in a lor~wall mime b e n e a t h a railway line and the surface subsiderne mo~itcri~ system. 815129 ~ S OF V~RY LARGE DEFOliaTiONS IN 'POTASH SALT' IN CONJUNCTION WITH AN ONGOING MINING OPERATION Sattler, A R; Christensen, C L Proc 21st US Symposium on Rock Mechanics, Rolla, Missouri, 28-30 May 1980, P~85-~9~ Describes room ami pillar d e f ~ t i o n measurement in a potash mine with a high extraction ratio; Two separate room pillar complexes were instrumented. In the first ccc~le~, floor-ceiling defarmations of al~m~c~m~tely I inc~day and pillar deformations aroumd i/2 imc~day were measured. In the secomd Caml~lex, In~..nentation was installed while the pillar was a part of a lot6 wall. Due to severe deformations encountered instrumentation had to be developed ~r modified fc~ these measurements. This ~al~r concentrates on experiment deslgn, design of special instrumentation amd field installation of eqtti~ment. 815130 GROUND CONTROL INVESTIGATIONS FOR ASSESSMENT OF ROOF CONDITIONS IN COAL MINES Bieniawakl, Z T; Newman, D A Proc Zlst US Symposium on Rock Mechandcs, Rolls, Missouri, 28-30 May 1980, P691-700 Reports diamond care drilllmg, borescope observation, bc~ehole and core lo6glng , amd geological mappi~ studies of roof cor~Itlons in 2 coal mines. Lab tests include uniaxlal c~p, essive strer~th, tensile strength, point load strength index, NUB cone indenter index, a~i slake durability inde~. Roof fall data from 2 mines enabled c o r r e l a t i o n b e t w e e n t h e roof s p a n and t h e s t a n d - u p t~me. The r o o f c o m d i t i o n s w e r e interpreted By means of emglneering rock mass classification systems. It was founi that the roof quality could be effectively assessed by the Gecmechanics Classification of rock masses. Improvements in the procedures fcr evaluatimg mine roof conditions are suggested. 68 refs. 815131 INFLUENCE OF STRATA CONTROL PARAM~,'~RS ON I~NGWAI.L MINING DESIGN Ura-~g, K F; Szwilskl, A B Proc 21st US Symposium on Rock Mechanics, Rolla, Missouri, 28"30 May 1980, I~20-728
Discusses a system of classlfyi~g the roof conditions from which a Roc~ ~ 1 1 t y Index may b e d e t e r m i n e d add u s e d a s a p a r a m e t e r f o r decldi~ the feasibility of loz~wall mini~j also the influence of the roof caving characteristics on the loading parameters at the coal face. A method to determine the req~ttred face advamce for the first cave of the gob is givmn. Fi~11y, criteria far the coal face s ~ c ~ t requirements are outlined.
815132 STRUCTURAL APPROACH TO SHAFT DESIGN FCR E~EP MINES IN HARD ROCK Beus, M J; ~A., S S M Proc 21st US Symposium on Rock Me-hamlcs, Rolla, Missouri, 28-30 May 1980, P780-786 Describes shaft design studies in the Coeur d'Alene m~n1~g district Of northern Idaho. Physical p r o p e r t y d a t a o f the mine r o c k s and in sltu ~tresses from sites at various depths are used as input to flnite-element models. A~lysis of the shaft stability urger various rock mass conditions, the type a~i dimension of the shaft suplxrts, proper orientation of the shaft, if other than circular, and the best time fc~ installation of per,~-mnt support are prime design considerations studied. An illustration is given to show a Prol~sed design procedure u s i ~ actual data frcm ore of the test sites. The structural aspects of circular and rectangular shafts are compered using concrete lining, timber, ani steel sets for support.
Tunnels See also: 815116, 815238 815133 JAPANESE TUNNEL DESIGN: LESSONS FOR THE US Paulson, B C Civ Emgmg, NY, VSI, N3, March 1981, P51-53 Discusses ~recast concrete tunnel liners, slurry shield tunrellimg a earth l~ress~e balanced shield, cut-and-cover Ja1~me~e style (nondisruptive excavation).
8151~ ~
IN ACTION Richardson, M; Scrt~y a J Tunn T-nnlg, VI3, N~, May 1981, P29-33
See item 815136 for an introduction to the system. The article describes l ~ r e l i ~ tests on the system of bladders (air hose used as tcroidal flat Jacks) and discusses specialist equipment necessary and its use in a trial in Gloucestershire, UK, where a 26m lomg, 1.8m diameter culvert was driven through an embankment with i. 5m of cover above the tunnel crown. No significant settlement ar loz~Itudlnal moveme~ of the grotmd was observed. 815135 OVERCOMINg; SqJEEZIEK) PRESSURES IN INDIA'S GXRI-RATA TUNNEL Dube, A K; Singh, B Tunn Tunnlg, VI3, N3, April 1981, PII-13 Discusses the excavation of a 3.6 m diameter pressure tunnel in squeezing grouni ani the use of flexible back-packlng between the rock ani the steel supports to overccme the problem. The method is not proved for highly dilati~ rock.