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Welkom seismological network
192A 894183 Program contour reference manual. PC version. Color contouring for 3-D data MacKinnon, R H: Perkins, B R CSIRO Division of Geomechanics Technical Report N152, Feb 1988, 15P
The program CONTOUR. written in FORTRAN 77, is described. It will produce line or continuous colour fill plots for 3-D surfaces and is designed for use in conjuction with 2D finite element analysis. Output can be to a pen plotter or graphics display. CONTOUR is compatible with the programs FEVEC and MOVIE used within CSIRO Geomechanics Division and will run on IBM compatible PCs or Sun Microsysterns workstations.
Avail: CSIRO Division of Geomcchanics, PO BOX 54, Mount Waverley, Vic 3149, Australia
894186 Comparison of methods for measuring horizontal movements on an anchored sheet pile wall Little, J A: Symons. I F: Williams, S G O Proc lnt Conference on Foundations and Tunnels, London, 2426 March 1987 V2. P137-145. Publ Edinburgh: Engineering Technics Press. 1987
Movement of the top of a temporary sheet pile wall during construction of a permanent retaining wall was measured directly by tensioned tape, using a subsurface magnetic extensometer, and indirectly using two different electronic distance measurement instruments. Results are compared and discussed. It may be good field practice to provide duplicate measurement for key parameters, to increase credibility of results with only slight increase in instrumentation costs.
Suggested testing methods and standards
894187 Sudbury local telemetered seismograph network Plouffe, M; Cajka, M G; Wetmiller, R J; Andrew, M D Proc 2nd International Symposium of Rockbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P327,332. Publ Minneapolis: University of Minnesota. 1988
894184 On the background to the formulae and accuracy of rock fracture toughness measurements using ISRM standard core specimens Ouchterlony, F Int J Rock Meeh Min Sci V26. NI, Jan 1989, PI3-23
The Sudbury Local Telemetered Network (SLTN) uses high resolution digital seismic equipment to monitor mining induced seismicity. Results to date show mining related seismic events have increased each year since 1984, and a significant number are not blast induced but possibly events induced by mining operations away from active mine workings.
The two Suggested Methods for determining the Fracture Toughness of Rock Material recommend use of short rod and chevron bend specimens, easily made from core pieces. In the background to formulae used, values for stress intensity factors and compliances are given, with linear correction terms for specimens within the tolerance limits. An assessment of transverse tensile failure in the short rod arms is made and an expression for crack speed versus controlling displacement rate is derived. A basic brittle fracture toughness evaluation is suggested which requires only load registration. A correction for non-brittle rate independent energy dissipation at the crack tip is also derived and the necessary steps to evaluate it are discussed. Finally, specimen calibration and fracture toughness testing work are discussed in the perspective of testing accuracy. Auth.
Monitoring rock and soil mass performance
894188 Welkom Seismological Network Mendecki, A J; Van Aswegen, G; Brown, J N R; Hewlett, P Proc 2nd International Symposium of Roekbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P367-377. Publ Minneapolis: University of Minnesota. 1988
The Welkom Seismological Network (WSN) is a broad band, wide dynamic range, fully digital mine network. Data from underground 3D geophone arrays are analysed to determine hypocentre, seismic moment, magnitude, corner frequency and stress drop for event recorded. The hardware and software are described, and methods for configuration of seismic networks and velocity structure quantification and location are outlined.
Analysis Techniques and Design Methods
See also: 894206 See also: 894018, 894332 894185 Measurement of rock mass deformation with grouted coaxial antenna cables Dowding, C H; Su, M B; O'Connor. K Rock Mech Rock Engng V22. NI. Jan-March 1989, PI-23
The use of reflected voltage pulses from grouted coaxial cables in rock masses to quantify type and magnitude of deformation is illustrated. Local extension and shear can be measured simultaneously. Deformation of the grouted cable changes its capacitance and hence the reflected waveform of the voltage pulse. Laboratory quantification of the technique,grout mix development, and performance of a TDR (Time Domain Reflectometry) monitoring system are described. Laboratory developed interpretive techniques are used to further analyse previously collected field data. ~
894189 Numerical solutions for elastic-plastic problems Mitchell, G P; Owen, D R J Engng Comput I/5, N4, Dec 1988, P274-284
Recent publications have highlighted the effectiveness of using a consistent tangent modulus when solving elastic-plastic problems. The formulation of a consistent tangent modulus is closely related to the scheme used to integrate the constitutive equations. Many of these schemes currently in use can be derived from certain broad classes of algorithms. These procedures are examined for a number of commonly used yield/failure criteria, including Tresca, Von Mises, Mohr-Coulomb and Drucker-Prager. For certain cases, a remarkably simple formulation results, which can lead to considerable savings in computational time. Auth.
1989 Pergamon Press pie. Reproduction not permitted
The program CONTOUR. written in FORTRAN 77, is described. It will produce line or continuous colour fill plots for 3-D surfaces and is designed for use in conjuction with 2D finite element analysis. Output can be to a pen plotter or graphics display. CONTOUR is compatible with the programs FEVEC and MOVIE used within CSIRO Geomechanics Division and will run on IBM compatible PCs or Sun Microsysterns workstations.
Avail: CSIRO Division of Geomcchanics, PO BOX 54, Mount Waverley, Vic 3149, Australia
894186 Comparison of methods for measuring horizontal movements on an anchored sheet pile wall Little, J A: Symons. I F: Williams, S G O Proc lnt Conference on Foundations and Tunnels, London, 2426 March 1987 V2. P137-145. Publ Edinburgh: Engineering Technics Press. 1987
Movement of the top of a temporary sheet pile wall during construction of a permanent retaining wall was measured directly by tensioned tape, using a subsurface magnetic extensometer, and indirectly using two different electronic distance measurement instruments. Results are compared and discussed. It may be good field practice to provide duplicate measurement for key parameters, to increase credibility of results with only slight increase in instrumentation costs.
Suggested testing methods and standards
894187 Sudbury local telemetered seismograph network Plouffe, M; Cajka, M G; Wetmiller, R J; Andrew, M D Proc 2nd International Symposium of Rockbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P327,332. Publ Minneapolis: University of Minnesota. 1988
894184 On the background to the formulae and accuracy of rock fracture toughness measurements using ISRM standard core specimens Ouchterlony, F Int J Rock Meeh Min Sci V26. NI, Jan 1989, PI3-23
The Sudbury Local Telemetered Network (SLTN) uses high resolution digital seismic equipment to monitor mining induced seismicity. Results to date show mining related seismic events have increased each year since 1984, and a significant number are not blast induced but possibly events induced by mining operations away from active mine workings.
The two Suggested Methods for determining the Fracture Toughness of Rock Material recommend use of short rod and chevron bend specimens, easily made from core pieces. In the background to formulae used, values for stress intensity factors and compliances are given, with linear correction terms for specimens within the tolerance limits. An assessment of transverse tensile failure in the short rod arms is made and an expression for crack speed versus controlling displacement rate is derived. A basic brittle fracture toughness evaluation is suggested which requires only load registration. A correction for non-brittle rate independent energy dissipation at the crack tip is also derived and the necessary steps to evaluate it are discussed. Finally, specimen calibration and fracture toughness testing work are discussed in the perspective of testing accuracy. Auth.
Monitoring rock and soil mass performance
894188 Welkom Seismological Network Mendecki, A J; Van Aswegen, G; Brown, J N R; Hewlett, P Proc 2nd International Symposium of Roekbursts and Seismicity in Mines, Minneapolis, 8-10 June 1988 P367-377. Publ Minneapolis: University of Minnesota. 1988
The Welkom Seismological Network (WSN) is a broad band, wide dynamic range, fully digital mine network. Data from underground 3D geophone arrays are analysed to determine hypocentre, seismic moment, magnitude, corner frequency and stress drop for event recorded. The hardware and software are described, and methods for configuration of seismic networks and velocity structure quantification and location are outlined.
Analysis Techniques and Design Methods
See also: 894206 See also: 894018, 894332 894185 Measurement of rock mass deformation with grouted coaxial antenna cables Dowding, C H; Su, M B; O'Connor. K Rock Mech Rock Engng V22. NI. Jan-March 1989, PI-23
The use of reflected voltage pulses from grouted coaxial cables in rock masses to quantify type and magnitude of deformation is illustrated. Local extension and shear can be measured simultaneously. Deformation of the grouted cable changes its capacitance and hence the reflected waveform of the voltage pulse. Laboratory quantification of the technique,grout mix development, and performance of a TDR (Time Domain Reflectometry) monitoring system are described. Laboratory developed interpretive techniques are used to further analyse previously collected field data. ~
894189 Numerical solutions for elastic-plastic problems Mitchell, G P; Owen, D R J Engng Comput I/5, N4, Dec 1988, P274-284
Recent publications have highlighted the effectiveness of using a consistent tangent modulus when solving elastic-plastic problems. The formulation of a consistent tangent modulus is closely related to the scheme used to integrate the constitutive equations. Many of these schemes currently in use can be derived from certain broad classes of algorithms. These procedures are examined for a number of commonly used yield/failure criteria, including Tresca, Von Mises, Mohr-Coulomb and Drucker-Prager. For certain cases, a remarkably simple formulation results, which can lead to considerable savings in computational time. Auth.
1989 Pergamon Press pie. Reproduction not permitted