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Boundary element method in geomechanics
25A
Monitoring rock and soil mass performance See also: 891288, 891358 891197 Development and field testing of a tension measuring gauge for c8ble bolts used
Choquet, P; Miller, F CIM BnIktin V81. N915, July 1988, PS3-59 An instrumentation system has been developed for monitoring the efficiency of cable bolts. The gauge is based on the resistance variation during loading of a thin wire, wound into the spiral grooves between the wire strands of the cable. Readings may be via an automatic logger or portable readout unit. Results of laboratory tests for calibration of the gauge, and field testing in underground and open pit mines are presented, showing performance of the gauge to be satisfactory. 89119% Microseismic monitoring of the infill trial at Castlefields mine, Dudley
Miller, A; Richards, J A; McCann, D M Proc 23rd Annual Conference of the Engineering Group of the GeologicaI Society, Engineering Geology of Underground Movements, Nottingham, 13-17 Sept 1987 P415-424. Pub1 Nottingham: Vnicersity o$ Nottingham, 1987 High costs of total mine backfill have led to the development of monitoring equipment to detect priority areas for remedial action. Geophones and seismometers were installed in an abandoned limestone mine, part of which was infilled with rock paste. Roof falls were adequately detected. More occurred in the unfilled part of the mine, but no evidence was found of major collapse. A crown hole formed nearby without distinct seismic activity, but unusual activity was recorded prior to the collapse. This may enable a localised monitoring network to provide warning of impending failure. 891199 Application of acoustic emission for the evaluation of microaeismic source location techniques
Kat, M; Hassani, F P; Momoh, 0 A Proc 23rd Annual Conference of the Engineering Group of the Geological Society, Engineering Geology of Underground Movements, Nottingham, 13-17 Sept 1987 P513-524. Pub1 Nottingham: University of Nottingham, 1987
microcomputers are described. To obtain the wide dynamic range required for mining seismological studies, it is recommended that data are digitized at source and digital data transmitted to the processor.
Analysis Techniques and Design Methods See also: 891015. 891091. 891099, 891102, 891112 891201 Boundary element method in geomechanics Brebbia, C A Proc ECONMIG 86, Stuttgart, 16-18 &ptember 1986 V2.
13P. Publ Stuttgart: University of Stuttgart, 1986 The BEM is particularly suitable for problems in geomechanits because of the simplicity of the mesh required to run a problem, and its ability to model domains extending to infinity. The governing relation of the BEM is described. Three typical applications are illustrated: steep valley excavation analysed as a no-tension material; semicircular tunnel with material as no tension; and deep tunnel in elastoplastic soil.
Rock block analysis 891202 Fully deformable discrete element analysis using a finite element approach
Ghaboussi, J Comput Geotech VS. N3, 1988. P17S-195 Overall movement of an assemblage of blocks is the result of rigid body motion and deformation of individual blocks. In many cases, the latter component must be taken into account. An analysis for these situations is presented. Each block is modelled as a single 4 node finite element, and a constitutive law is used to calculate contact forces. Separation, rotation, and friction are allowed. Results of analyses of a circular arch and blocks under self weight, with and without deformable blocks, are compared. Neglect of block deformation can lead to significant inaccuracies.
Microseismic monitoring is used to locate potentially unstable areas in underground mines. To evaluate source location techniques, events were generated at randomly chosen locations inside and outside a I000 cubic m rock block and recorded by random, planar, and geometric arrays of geophones. The data were processed using various techniques, USBM least squares, Mount Isa, Simplex. Diminishing cube, and Simplex combination approach. Results are compared and discussed. Methods were also evaluated using blast tests at a mine.
891203 Total formulation for large strains in soils
891200
Dluzewski, J M Comput Geotech VS. N3. 1988. P197-211
Instrumentation networks for observation of mine-induced seismicity Green, R W E
Proc 2nd International Symposium of Rockbursts and Seismi~ity in Mines, Minneapolis, 8-X0 June 1988. Keynote Presentations P142-IS6. Pub1 Minneapolis: University o$ Minnesota, 1988 The history of tremor studies is briefly summarised. State of the art monitoring systems which can be developed using relatively inexpensive data acquisition instrumentation linked to 0
Stress analysis See also: 891135. 891280. 891366
A total Eulerian finite element formulation is presented for problems of large strains in physically nonlinear materials. The constitutive equations are defined in the stress-strain form, thus no flow theory is involved. The loading process only is discussed, so the constitutive equations in that form can also be applied to nonlinearly elastic materials. The obtained secant stiffness matrix is nonsymmetrical due to nonlinear terms of the Almansi strain tensor. As a numerical example, the standard triaxial compression test is defined. Auth.
1989 Pergamon Press plc. Reproduction
not permitted
Monitoring rock and soil mass performance See also: 891288, 891358 891197 Development and field testing of a tension measuring gauge for c8ble bolts used
Choquet, P; Miller, F CIM BnIktin V81. N915, July 1988, PS3-59 An instrumentation system has been developed for monitoring the efficiency of cable bolts. The gauge is based on the resistance variation during loading of a thin wire, wound into the spiral grooves between the wire strands of the cable. Readings may be via an automatic logger or portable readout unit. Results of laboratory tests for calibration of the gauge, and field testing in underground and open pit mines are presented, showing performance of the gauge to be satisfactory. 89119% Microseismic monitoring of the infill trial at Castlefields mine, Dudley
Miller, A; Richards, J A; McCann, D M Proc 23rd Annual Conference of the Engineering Group of the GeologicaI Society, Engineering Geology of Underground Movements, Nottingham, 13-17 Sept 1987 P415-424. Pub1 Nottingham: Vnicersity o$ Nottingham, 1987 High costs of total mine backfill have led to the development of monitoring equipment to detect priority areas for remedial action. Geophones and seismometers were installed in an abandoned limestone mine, part of which was infilled with rock paste. Roof falls were adequately detected. More occurred in the unfilled part of the mine, but no evidence was found of major collapse. A crown hole formed nearby without distinct seismic activity, but unusual activity was recorded prior to the collapse. This may enable a localised monitoring network to provide warning of impending failure. 891199 Application of acoustic emission for the evaluation of microaeismic source location techniques
Kat, M; Hassani, F P; Momoh, 0 A Proc 23rd Annual Conference of the Engineering Group of the Geological Society, Engineering Geology of Underground Movements, Nottingham, 13-17 Sept 1987 P513-524. Pub1 Nottingham: University of Nottingham, 1987
microcomputers are described. To obtain the wide dynamic range required for mining seismological studies, it is recommended that data are digitized at source and digital data transmitted to the processor.
Analysis Techniques and Design Methods See also: 891015. 891091. 891099, 891102, 891112 891201 Boundary element method in geomechanics Brebbia, C A Proc ECONMIG 86, Stuttgart, 16-18 &ptember 1986 V2.
13P. Publ Stuttgart: University of Stuttgart, 1986 The BEM is particularly suitable for problems in geomechanits because of the simplicity of the mesh required to run a problem, and its ability to model domains extending to infinity. The governing relation of the BEM is described. Three typical applications are illustrated: steep valley excavation analysed as a no-tension material; semicircular tunnel with material as no tension; and deep tunnel in elastoplastic soil.
Rock block analysis 891202 Fully deformable discrete element analysis using a finite element approach
Ghaboussi, J Comput Geotech VS. N3, 1988. P17S-195 Overall movement of an assemblage of blocks is the result of rigid body motion and deformation of individual blocks. In many cases, the latter component must be taken into account. An analysis for these situations is presented. Each block is modelled as a single 4 node finite element, and a constitutive law is used to calculate contact forces. Separation, rotation, and friction are allowed. Results of analyses of a circular arch and blocks under self weight, with and without deformable blocks, are compared. Neglect of block deformation can lead to significant inaccuracies.
Microseismic monitoring is used to locate potentially unstable areas in underground mines. To evaluate source location techniques, events were generated at randomly chosen locations inside and outside a I000 cubic m rock block and recorded by random, planar, and geometric arrays of geophones. The data were processed using various techniques, USBM least squares, Mount Isa, Simplex. Diminishing cube, and Simplex combination approach. Results are compared and discussed. Methods were also evaluated using blast tests at a mine.
891203 Total formulation for large strains in soils
891200
Dluzewski, J M Comput Geotech VS. N3. 1988. P197-211
Instrumentation networks for observation of mine-induced seismicity Green, R W E
Proc 2nd International Symposium of Rockbursts and Seismi~ity in Mines, Minneapolis, 8-X0 June 1988. Keynote Presentations P142-IS6. Pub1 Minneapolis: University o$ Minnesota, 1988 The history of tremor studies is briefly summarised. State of the art monitoring systems which can be developed using relatively inexpensive data acquisition instrumentation linked to 0
Stress analysis See also: 891135. 891280. 891366
A total Eulerian finite element formulation is presented for problems of large strains in physically nonlinear materials. The constitutive equations are defined in the stress-strain form, thus no flow theory is involved. The loading process only is discussed, so the constitutive equations in that form can also be applied to nonlinearly elastic materials. The obtained secant stiffness matrix is nonsymmetrical due to nonlinear terms of the Almansi strain tensor. As a numerical example, the standard triaxial compression test is defined. Auth.
1989 Pergamon Press plc. Reproduction
not permitted