- Email: [email protected]
Field application of computer graphics for monitoring borehole trajectories
225A
Suggested testing methods and standards 904227 BS frost-heave test Pike, D C; Sherwood, P T; Sym, R Quarry Manage Feb 1990. P25-30 The TRRL laboratory test (Report RL90, 1967) was developed to examine frost susceptibility of soils, but has been widely used as a compliance test for unbound aggregates. Further improvements have been made to the original method, and with modifications these have been adopted as BS812 part 124, Method of determining frost heave, 1989. The development of the standard is described, and it is demonstrated that the precision of the test could be improved by using reference aggregates of known properties.
Monitoring rock and soil mass performance 904228 Monitoring vibration Fairweather, V Cir Engng, N Y V60. NI. Jan 1990. P66-69 Vibration monitoring during and after construction has become very important as the size of liability claims has soared. Remote instrumentation for vibration monitoring, data logging, and data processing is described. Timing of blasting or pile driving must be adjusted to avoid exciting surrounding soil or structures at their resonant frequencies. Determination of relevant site parameters to avoid severe vibration is briefly examined.
904229 Outsmarting blast vibrations Froedge, D T Coal V26. Nil. Nov 1989. P67-69 The lso-Seismic System for monitoring and mapping blast vibrations is described. Large numbers of self contained, miniature computerised seismographs are employed. They are attached to a motherboard for simultaneous programming, placed on site for recording, then returned to the motherboard for downloading of data, which are displayed using a CAD type data base. lsomaps for a Connecticut quarry are displayed. Possible applications are discussed.
904~1 Laser h01ollraphic measurements of tidal deformation of a tunnel Takemoto, S Geophys J VIO0, NI. Jan 1990, P99-106 Holographic interferometry was used to monitor deformation of a tunnel wall in the Amagase Crustal Movement Observatory. A hologram of the wall was made and the plate reset in the original position of the hologram. When the reconstructed image of the hologram is superimposed on the current image of the wall, fringes are continuously recorded using a video camera. Tidal deformations measured in this manner are consistent with those from laser extensometers. These results substantiate tunnel deformations predicted using finite element analysis.
904232 Field application of computer graphics for monitoring borehole trajectories Santos, O L; Maldla, E E; Langllnais, J P J Pet Technol V41. NI2. Dec 1989. P!254-1258 Monitoring of directional drilling is important in petroleum engineering. A PC based program which can handle multiple wells and allows integration of large amounts of data into a useable form is presented. Horizontal, vertical or pseudo-3 dimensional sections are possible. It is illustrated modelling 20 wells drilled offshore in the Campos Basin and in monitoring the progress of drilling a relief well.
904233 Acoustic emissions in a quarry Reymond, M C Proc 1st International Symposium on Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 VI, P563-565. Publ Rotterdam: A A Balkema. 1988 Acoustic emission was monitored over a year in an underground limestone quarry loaded by embankments on the surface. Stress strain data were also gathered from pillars. The first phase of AE was associated with increasing rock pressure and corresponded to fracturing of the roof rock. The second phase, at constant load, was characterised by sudden peaks of activity, corresponding to observed formation and growth of cracks in pillars. Stress strain characteristics correlated well with acoustic emission. The quarry was considered stable.
904230 Design and installation of a combined automatic tensiometerpiezometer system Anderson. M G; Kemp, M J; Lloyd, D M; Othman, A Earth Surf Process Land F15, NI, Feb 1990. P63-71
904234 Monitoring of a tunnel excavated in shallow depth Noami, H; Nagano, S; Sakurai, S Proc 2nd International Symposium on Field Measurements in Geomechanics, Kobe, 6-9 April 1987 V2. P851-859. Publ Rotterdam: A A Balkema. 1988
A system developed for monitoring both positive and negative pore pressures is presented. It consists of Casagrande type piezometers buried beneath the phreatic surface, automatic tensiometers, and a battery powered datalogger. Installation of the system in a cut slope alongside a Malaysian highway is described. The system was used to establish whether suction was maintained near the soil surface during storm events, and to compare surface guniting or hydroseeding for improving soil conditions.
The NATM project in weathered granite was monitored, with ground and tunnel displacements, stresses in bolts and shotcrete, crown settlement and convergence measured. Back analysis was by the Direct Strain Evaluation Technique (DSET) of Sakurai, based on comparison of calculated strain with critical strain for ground materials. Tunnel stability is guaranteed if strain occurring is less than critical strain. The finite element program DBAP is used to determine strain distribution from monitoring data.
© 1990 Pergamon Press plc. Reproduction not permitted RMMS 27 4--I
Suggested testing methods and standards 904227 BS frost-heave test Pike, D C; Sherwood, P T; Sym, R Quarry Manage Feb 1990. P25-30 The TRRL laboratory test (Report RL90, 1967) was developed to examine frost susceptibility of soils, but has been widely used as a compliance test for unbound aggregates. Further improvements have been made to the original method, and with modifications these have been adopted as BS812 part 124, Method of determining frost heave, 1989. The development of the standard is described, and it is demonstrated that the precision of the test could be improved by using reference aggregates of known properties.
Monitoring rock and soil mass performance 904228 Monitoring vibration Fairweather, V Cir Engng, N Y V60. NI. Jan 1990. P66-69 Vibration monitoring during and after construction has become very important as the size of liability claims has soared. Remote instrumentation for vibration monitoring, data logging, and data processing is described. Timing of blasting or pile driving must be adjusted to avoid exciting surrounding soil or structures at their resonant frequencies. Determination of relevant site parameters to avoid severe vibration is briefly examined.
904229 Outsmarting blast vibrations Froedge, D T Coal V26. Nil. Nov 1989. P67-69 The lso-Seismic System for monitoring and mapping blast vibrations is described. Large numbers of self contained, miniature computerised seismographs are employed. They are attached to a motherboard for simultaneous programming, placed on site for recording, then returned to the motherboard for downloading of data, which are displayed using a CAD type data base. lsomaps for a Connecticut quarry are displayed. Possible applications are discussed.
904~1 Laser h01ollraphic measurements of tidal deformation of a tunnel Takemoto, S Geophys J VIO0, NI. Jan 1990, P99-106 Holographic interferometry was used to monitor deformation of a tunnel wall in the Amagase Crustal Movement Observatory. A hologram of the wall was made and the plate reset in the original position of the hologram. When the reconstructed image of the hologram is superimposed on the current image of the wall, fringes are continuously recorded using a video camera. Tidal deformations measured in this manner are consistent with those from laser extensometers. These results substantiate tunnel deformations predicted using finite element analysis.
904232 Field application of computer graphics for monitoring borehole trajectories Santos, O L; Maldla, E E; Langllnais, J P J Pet Technol V41. NI2. Dec 1989. P!254-1258 Monitoring of directional drilling is important in petroleum engineering. A PC based program which can handle multiple wells and allows integration of large amounts of data into a useable form is presented. Horizontal, vertical or pseudo-3 dimensional sections are possible. It is illustrated modelling 20 wells drilled offshore in the Campos Basin and in monitoring the progress of drilling a relief well.
904233 Acoustic emissions in a quarry Reymond, M C Proc 1st International Symposium on Penetration Testing, ISOPT-I, Orlando,20-24 March 1988 VI, P563-565. Publ Rotterdam: A A Balkema. 1988 Acoustic emission was monitored over a year in an underground limestone quarry loaded by embankments on the surface. Stress strain data were also gathered from pillars. The first phase of AE was associated with increasing rock pressure and corresponded to fracturing of the roof rock. The second phase, at constant load, was characterised by sudden peaks of activity, corresponding to observed formation and growth of cracks in pillars. Stress strain characteristics correlated well with acoustic emission. The quarry was considered stable.
904230 Design and installation of a combined automatic tensiometerpiezometer system Anderson. M G; Kemp, M J; Lloyd, D M; Othman, A Earth Surf Process Land F15, NI, Feb 1990. P63-71
904234 Monitoring of a tunnel excavated in shallow depth Noami, H; Nagano, S; Sakurai, S Proc 2nd International Symposium on Field Measurements in Geomechanics, Kobe, 6-9 April 1987 V2. P851-859. Publ Rotterdam: A A Balkema. 1988
A system developed for monitoring both positive and negative pore pressures is presented. It consists of Casagrande type piezometers buried beneath the phreatic surface, automatic tensiometers, and a battery powered datalogger. Installation of the system in a cut slope alongside a Malaysian highway is described. The system was used to establish whether suction was maintained near the soil surface during storm events, and to compare surface guniting or hydroseeding for improving soil conditions.
The NATM project in weathered granite was monitored, with ground and tunnel displacements, stresses in bolts and shotcrete, crown settlement and convergence measured. Back analysis was by the Direct Strain Evaluation Technique (DSET) of Sakurai, based on comparison of calculated strain with critical strain for ground materials. Tunnel stability is guaranteed if strain occurring is less than critical strain. The finite element program DBAP is used to determine strain distribution from monitoring data.
© 1990 Pergamon Press plc. Reproduction not permitted RMMS 27 4--I