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Creep of weak rocks in the Burgin Mine
~4A
the possibility of fill liquefaction, support of stope walls by the fill, the fill as a working platform, stability of the rock mass, and dimensions of ore pillars. Avail: CSIRO Division of Applied Geomechanics, PO Box 54, Mt Waverley, 3149, Vie, Australia 773086 GEOTECHNICAL STUDY OF THE SQUEEZE PROBLEM ASSOCIatED W I ~ THE UNDERGROUND MINING OF COAL G~, H C Ph D thesis , Univ of Illinois at UrbanaChampaign, 1975, 265P Reports a study of squeezing in an Illinois coal mine. Estimates of floor unit strength were obtained from unlsxial unconfined compressive strength tests on core segments and frc~ static penetrometer tests conducted within the mine, and values of the peak and shearing friction were estimated using the plasticity indax. Data suggest that a low strength zone about 6ft thick is located about 12ft below the coal. A theoretical analysis leads to prediction of floc~ strengths. Avail: University Microfilms, 18, Bedford Row, London WCIR 4El, UK
773o87 CREEP OF WEAK ROCKS IN THE BURGIN MINE Cogan, J Ph D thesis, Stanford Unlv, 1975, 328P Creep phenomena of shale, dolomite and fractured quartzite from the Burgin Mine, Eureka, Utah, ware determined by means of a programme of mine studies, lab testing and viscoelastic model studies. Drift closure rates in the mine were found to be constant as long as mining activity was far from the measuring station, varying with rock type. Rates responded to changes in nearby mining activity. Props retarded creep rates in non-llnear proportion to prop load. Avail: University Microfilms, 18, Bedford Row, London WCIR 4EJ, UK
multilayered medium to determine displacements, strains ar~ stresses for a face advance in the subcritical to the critical width of extraction. Bed separation ard recontact criteria ere included as part of the model along with gob consolidation behaviour, with or without backfilling. The model is restricted to a plane strain analysis of an isotropic elastic-perfectly plastic material. The model was tested against average NCB field data and a South African case study. Good agreement was obtained. Avail: University Microfilms, 18, Bedford R ~ , Lordon WCLR 4E.!, UK
Tunnels 773090 ROS~ PROPERTY TESTING FOR THE ASSESSV~RT OF TUNNELLING MACHINE PL~FO.~MANCE McFeat-Sm/th~ I Tunn Tunnlg, Vg, N2, 1977, P29-33 A number of rock property tests have been developed for use in a rock property matrix for the prediction of the cutting performance of roadheader tunnellirg machines for sedimentary rocks. The properties quantified are the type and degree of concentration, indentation hardness, rebouni hardness, ard the influence of micro-bedding planes as determined by wave velocity measur e~nents. 773091 GEOTECHNICAL ASFECTS OF THE CHINNOR TUNNELLING TRIALS Ground Ergrg, Vl0, N2, March 1977, P34-37,50 Discusses the following aspects of the trials carried out with a 5m diameter tunnel boring machine in chalk: site invmstigation, instrumented drilling trials, face indexing prcgra~ne, seismic tests, rock cutting characteristics, ground movement measurements, tunnel Jacking tests~ theoretical analysis of ground movement, rockbolt tests and ahutcreting trials.
773088 INFLUENCE OF BOUNDARY WEAKENING TECHNIQUES ON THE HLOCK CAVING MINING MEq~OD Kratulovlc, L G Eng Sc D thesis, Columbia Univ, 1974, 149P An isolated block of ore located in a homogeneous isutropic ard linearly elastic medium was simulated by 3-dlmensional finite elements, and the effect of the followimg parameters on the cavir~ process was investigated; i. Boumdary weakening methods. 2. Boumdary weakenimg amd ur~ercut of different dimensions.~ 3. Bourdary weakening and tectonic stresses; Progressive caving of the block was simulated by successive iterations in the computer. The 3-dimeusional finite element model used in these studies provided a very low information densityI seriously limiting the scope of the relm~esentation smzl the interpretation of results. Avail: University Microfilms, 18 Bedford Row, Lomdon WCIR MEJ, UK
773089
MA~IAL MCDEL OF GROUND MOVEMENT DUE TO UNDERGROUND MINING Mozumdar, B K P h D thesis, Pennsylvania State Univ, 1974,
145P Finite element methods were applied to a
773092 EXPERIENCE IN FURTHER DEVELOPMEN2 OF THE SH(ECRETE METHOD USED IN SK;SWAY CONSTRUCTION
IN ~
(IN O E ~ )
Kr i~er, H Rock Mech, Suppl 5, 1976, P209-222 (paper to 24th Geomechanlcal Colloqui1~n, Austrian Society for Geomechanlcs, Salzburg, 2-3 Oct 1975) Describes the shotcrete method as n~rmally used and then discusses special problems occurring at different contract sections of the Frankfurt subway, and how these were overc~me, including a r~wly developed cuttimg machine. 773093 GEOI~CHNICAL PROBLEMS IN CONSTRUCTISK; THE
BUDAPEST U~IERGROU~D (IN GERMAN) Greschik, G Rock Mech, Suppl 5, 1976, P223-229 (paper to 24th Geomechanlcal Colloquium, Austrian Society for Geomechanics, Salzburg, 2-3 Oct
1975 ) The subsoil is a double l~ver structure, dipped n~ogene loam-clay layers unler]ying saturated Pleistocene sand and gravel. There are permeable Joints from the Pleistocezm aquifer to the tunnel under cons~u~tion. Although the sard is clayey, some heavy flows have been observed. Problems arose in the faulted zones,
the possibility of fill liquefaction, support of stope walls by the fill, the fill as a working platform, stability of the rock mass, and dimensions of ore pillars. Avail: CSIRO Division of Applied Geomechanics, PO Box 54, Mt Waverley, 3149, Vie, Australia 773086 GEOTECHNICAL STUDY OF THE SQUEEZE PROBLEM ASSOCIatED W I ~ THE UNDERGROUND MINING OF COAL G~, H C Ph D thesis , Univ of Illinois at UrbanaChampaign, 1975, 265P Reports a study of squeezing in an Illinois coal mine. Estimates of floor unit strength were obtained from unlsxial unconfined compressive strength tests on core segments and frc~ static penetrometer tests conducted within the mine, and values of the peak and shearing friction were estimated using the plasticity indax. Data suggest that a low strength zone about 6ft thick is located about 12ft below the coal. A theoretical analysis leads to prediction of floc~ strengths. Avail: University Microfilms, 18, Bedford Row, London WCIR 4El, UK
773o87 CREEP OF WEAK ROCKS IN THE BURGIN MINE Cogan, J Ph D thesis, Stanford Unlv, 1975, 328P Creep phenomena of shale, dolomite and fractured quartzite from the Burgin Mine, Eureka, Utah, ware determined by means of a programme of mine studies, lab testing and viscoelastic model studies. Drift closure rates in the mine were found to be constant as long as mining activity was far from the measuring station, varying with rock type. Rates responded to changes in nearby mining activity. Props retarded creep rates in non-llnear proportion to prop load. Avail: University Microfilms, 18, Bedford Row, London WCIR 4EJ, UK
multilayered medium to determine displacements, strains ar~ stresses for a face advance in the subcritical to the critical width of extraction. Bed separation ard recontact criteria ere included as part of the model along with gob consolidation behaviour, with or without backfilling. The model is restricted to a plane strain analysis of an isotropic elastic-perfectly plastic material. The model was tested against average NCB field data and a South African case study. Good agreement was obtained. Avail: University Microfilms, 18, Bedford R ~ , Lordon WCLR 4E.!, UK
Tunnels 773090 ROS~ PROPERTY TESTING FOR THE ASSESSV~RT OF TUNNELLING MACHINE PL~FO.~MANCE McFeat-Sm/th~ I Tunn Tunnlg, Vg, N2, 1977, P29-33 A number of rock property tests have been developed for use in a rock property matrix for the prediction of the cutting performance of roadheader tunnellirg machines for sedimentary rocks. The properties quantified are the type and degree of concentration, indentation hardness, rebouni hardness, ard the influence of micro-bedding planes as determined by wave velocity measur e~nents. 773091 GEOTECHNICAL ASFECTS OF THE CHINNOR TUNNELLING TRIALS Ground Ergrg, Vl0, N2, March 1977, P34-37,50 Discusses the following aspects of the trials carried out with a 5m diameter tunnel boring machine in chalk: site invmstigation, instrumented drilling trials, face indexing prcgra~ne, seismic tests, rock cutting characteristics, ground movement measurements, tunnel Jacking tests~ theoretical analysis of ground movement, rockbolt tests and ahutcreting trials.
773088 INFLUENCE OF BOUNDARY WEAKENING TECHNIQUES ON THE HLOCK CAVING MINING MEq~OD Kratulovlc, L G Eng Sc D thesis, Columbia Univ, 1974, 149P An isolated block of ore located in a homogeneous isutropic ard linearly elastic medium was simulated by 3-dlmensional finite elements, and the effect of the followimg parameters on the cavir~ process was investigated; i. Boumdary weakening methods. 2. Boumdary weakenimg amd ur~ercut of different dimensions.~ 3. Bourdary weakening and tectonic stresses; Progressive caving of the block was simulated by successive iterations in the computer. The 3-dimeusional finite element model used in these studies provided a very low information densityI seriously limiting the scope of the relm~esentation smzl the interpretation of results. Avail: University Microfilms, 18 Bedford Row, Lomdon WCIR MEJ, UK
773089
MA~IAL MCDEL OF GROUND MOVEMENT DUE TO UNDERGROUND MINING Mozumdar, B K P h D thesis, Pennsylvania State Univ, 1974,
145P Finite element methods were applied to a
773092 EXPERIENCE IN FURTHER DEVELOPMEN2 OF THE SH(ECRETE METHOD USED IN SK;SWAY CONSTRUCTION
IN ~
(IN O E ~ )
Kr i~er, H Rock Mech, Suppl 5, 1976, P209-222 (paper to 24th Geomechanlcal Colloqui1~n, Austrian Society for Geomechanlcs, Salzburg, 2-3 Oct 1975) Describes the shotcrete method as n~rmally used and then discusses special problems occurring at different contract sections of the Frankfurt subway, and how these were overc~me, including a r~wly developed cuttimg machine. 773093 GEOI~CHNICAL PROBLEMS IN CONSTRUCTISK; THE
BUDAPEST U~IERGROU~D (IN GERMAN) Greschik, G Rock Mech, Suppl 5, 1976, P223-229 (paper to 24th Geomechanlcal Colloquium, Austrian Society for Geomechanics, Salzburg, 2-3 Oct
1975 ) The subsoil is a double l~ver structure, dipped n~ogene loam-clay layers unler]ying saturated Pleistocene sand and gravel. There are permeable Joints from the Pleistocezm aquifer to the tunnel under cons~u~tion. Although the sard is clayey, some heavy flows have been observed. Problems arose in the faulted zones,