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Reduction of face vibration in quarries at Quenast (in French and Dutch)
2~A
871162 Elasto/viscoplastic constitutive equation of normally consolidated clays based on flow surface theory Matsui. T: Abe. N Proc 5th International Conference on .Vumerical Alethods in Geomechanics, Nagoya, 1-5 April 1985 V1. P407-413. Publ Rotterdam." A. A. Balkema. 1985 An elasto/viscoplasttc constitutive equation for normally consolidated clays, based on the flow surface theory, is proposed. In the model, the clays are assumed to be an tsotropic elasto,'viscoplastic body, and the evolutional equauon of the viscous volumetric strain is used in the derivation of the flow surface. Consequently, the constitution of the model becomes lucid and unified. The uses of the model are demonstrated through some numerical examples.
871163 Numerical analysis to identify the unknown load distribution around a power tunnel lining Fanelli, M; Favro. R; Fornero, I: Guiseppetti, G: Mazza. G: Paolina, R Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August t986 V1, P297-306. Publ O.~ford: Pergamon Press, 1986 Cracking was observed in the concrete lining o f a power tunnel. Only limited site investigation was possible as long interruptions to the services were not permissible. The cracks were found to be in an area containing a slip surface and several faults, and having a RQD of less than 20%. A numerical procedure is proposed to identify load and deformation distribution around the tunnel from such limited information. Linear elastic behaviour of the concrete and simultaneous appearance of the cracks were assumed. Load distributions consistent with observed behaviour are reported.
accepted and which are not. and now these oa>~c ~tSStlmptlo~> affect design criteria are examined. The development of design models is reviewed, and the models are compared, analysing ways in v,hich they differ from each other. The compariso~ ~> limited to tunnels in soft ground and to that part of the structural model concerned with the tunnel lining.
Rock Breakage and Excavation 871166 Cuttability and drillability of rock Bamford, W E
Civ Coil Tech Report Engrs Australia 11 Juh" 1986. 4P It would be desirable to be able to quantify the "ease of rock breaking' for geological materials. A variety of geotechnicat investigation techniques is currently used to examine the 'breakability', based on the following: standard mechanical properties: microstructure: micro- or mint-cutter tests: structure: and field performance. A subjective view of the reliability and convenience of these tests, singly or In combination, is presented. International standardisation, as recommended by the Commission on Rock Boreability. Cuttability, and Drillability of the ISRM.is described. This involves description under six headings: hardness: strength: drillabitity; abrasiveness: structure; and other relevant parameters. Preferred and tolerated tests are listed. Finally. standardised test procedures and drillability tests are considered.
Drilling
871164 Cavity expansion in cohesive frictional soils Carter, J P; Booker. J R; Yeung, S K University of Sydney School of Civil and Mining Engineering report R507, Sept 1985, 29P
871167 Wave propagation and rock fracturing mechanisms with percussive drilling (In German) Hecker. R
Closed form solutions are presented for the expansion of spherical and cylindrical cavities in an ideal cohesive-frictional soil. An explicit solution to the pressure-expansion curve can be found for small strain deformation. Numerical techniques are needed to determine the complete pressure-expansion curve for large strain deformation, although the precise value of the limiting pressure can be obtained analytically. The small strain solution is applicable to the interpretation of pressuremeter tests in sands, and the limit pressures have application to the problems of pile installation and end bearing pressure of deep foundations.
The influence of length or diameter ratio of the hammer to the drill bit, and of the diameter o f the contacting bit-hammer surfaces on the effectiveness of percussion drillings is investigated.
Avail: University of Sydney, School of Civil and Mining
871168 Reduction of face vibration in quarries at Quenast (In French and Dutch) Honore, M Ann Mines Beig N1-2, Jan-Feb t986, P503-514
Engineering, NSW 2006, Australia
Design methods
Gluckauf-forschungsh V47, N4, Aug 1986, P191-t97
Blasting See also." 871129
--Factors affecting the level of vibration at any point include the type of explosive, initiation, mine geometry, and distance from the explosion. The influences o f the initiation system and quantity of explosive have been examined in quartz diorite at Quenast, Belgium. For lateral initiation, the effects o f using The structural model for a tunnel, to ensure it is suitable, safe bottom holes or under level mining are compared. For undertevel mining, lateral or exact initiation are compared. and economic, includes items which must be translated from reality into a mechanical-mathematical engineering model. The influence of explosive load is examined using 105 and The basic assumptions of design models, which are generally 165mm diameter boreholes
871165 Structural design models for tunnels in soft soil Duddeck, H; Erdmann, J Underground Space If9, N5-6. 1985, P246-259
© 1986 Pergamon Journals Ltd. Reproduction not permitted
871162 Elasto/viscoplastic constitutive equation of normally consolidated clays based on flow surface theory Matsui. T: Abe. N Proc 5th International Conference on .Vumerical Alethods in Geomechanics, Nagoya, 1-5 April 1985 V1. P407-413. Publ Rotterdam." A. A. Balkema. 1985 An elasto/viscoplasttc constitutive equation for normally consolidated clays, based on the flow surface theory, is proposed. In the model, the clays are assumed to be an tsotropic elasto,'viscoplastic body, and the evolutional equauon of the viscous volumetric strain is used in the derivation of the flow surface. Consequently, the constitution of the model becomes lucid and unified. The uses of the model are demonstrated through some numerical examples.
871163 Numerical analysis to identify the unknown load distribution around a power tunnel lining Fanelli, M; Favro. R; Fornero, I: Guiseppetti, G: Mazza. G: Paolina, R Proc International Symposium on Large Rock Caverns, Helsinki, 25-28 August t986 V1, P297-306. Publ O.~ford: Pergamon Press, 1986 Cracking was observed in the concrete lining o f a power tunnel. Only limited site investigation was possible as long interruptions to the services were not permissible. The cracks were found to be in an area containing a slip surface and several faults, and having a RQD of less than 20%. A numerical procedure is proposed to identify load and deformation distribution around the tunnel from such limited information. Linear elastic behaviour of the concrete and simultaneous appearance of the cracks were assumed. Load distributions consistent with observed behaviour are reported.
accepted and which are not. and now these oa>~c ~tSStlmptlo~> affect design criteria are examined. The development of design models is reviewed, and the models are compared, analysing ways in v,hich they differ from each other. The compariso~ ~> limited to tunnels in soft ground and to that part of the structural model concerned with the tunnel lining.
Rock Breakage and Excavation 871166 Cuttability and drillability of rock Bamford, W E
Civ Coil Tech Report Engrs Australia 11 Juh" 1986. 4P It would be desirable to be able to quantify the "ease of rock breaking' for geological materials. A variety of geotechnicat investigation techniques is currently used to examine the 'breakability', based on the following: standard mechanical properties: microstructure: micro- or mint-cutter tests: structure: and field performance. A subjective view of the reliability and convenience of these tests, singly or In combination, is presented. International standardisation, as recommended by the Commission on Rock Boreability. Cuttability, and Drillability of the ISRM.is described. This involves description under six headings: hardness: strength: drillabitity; abrasiveness: structure; and other relevant parameters. Preferred and tolerated tests are listed. Finally. standardised test procedures and drillability tests are considered.
Drilling
871164 Cavity expansion in cohesive frictional soils Carter, J P; Booker. J R; Yeung, S K University of Sydney School of Civil and Mining Engineering report R507, Sept 1985, 29P
871167 Wave propagation and rock fracturing mechanisms with percussive drilling (In German) Hecker. R
Closed form solutions are presented for the expansion of spherical and cylindrical cavities in an ideal cohesive-frictional soil. An explicit solution to the pressure-expansion curve can be found for small strain deformation. Numerical techniques are needed to determine the complete pressure-expansion curve for large strain deformation, although the precise value of the limiting pressure can be obtained analytically. The small strain solution is applicable to the interpretation of pressuremeter tests in sands, and the limit pressures have application to the problems of pile installation and end bearing pressure of deep foundations.
The influence of length or diameter ratio of the hammer to the drill bit, and of the diameter o f the contacting bit-hammer surfaces on the effectiveness of percussion drillings is investigated.
Avail: University of Sydney, School of Civil and Mining
871168 Reduction of face vibration in quarries at Quenast (In French and Dutch) Honore, M Ann Mines Beig N1-2, Jan-Feb t986, P503-514
Engineering, NSW 2006, Australia
Design methods
Gluckauf-forschungsh V47, N4, Aug 1986, P191-t97
Blasting See also." 871129
--Factors affecting the level of vibration at any point include the type of explosive, initiation, mine geometry, and distance from the explosion. The influences o f the initiation system and quantity of explosive have been examined in quartz diorite at Quenast, Belgium. For lateral initiation, the effects o f using The structural model for a tunnel, to ensure it is suitable, safe bottom holes or under level mining are compared. For undertevel mining, lateral or exact initiation are compared. and economic, includes items which must be translated from reality into a mechanical-mathematical engineering model. The influence of explosive load is examined using 105 and The basic assumptions of design models, which are generally 165mm diameter boreholes
871165 Structural design models for tunnels in soft soil Duddeck, H; Erdmann, J Underground Space If9, N5-6. 1985, P246-259
© 1986 Pergamon Journals Ltd. Reproduction not permitted