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Sampling of saturated and unsaturated sands by freezing
30A 911231 In situ evaluation of rock mass stiffness variations for underground openings using surface wave and borehole seismic methods Nelson, P P; Lopez, M; Stokoe, K H; Roblee, C J Proc 7th Annual Workshop Generic Mineral Technology Center Mine Systems Design and Ground Control, Blackshnrg, 22-24 October 1989 P35-46. Publ Blacksburg: Virginia Polytechnic Institute and State University, 1989 Rock mass stiffness changes and damage zone extent are evaluated quickly and quantitatively using seismic methods. Surface wave testing methods are shown to be advantageous for rock mass evaluation since borehole access is not required. Testing using surface wave and borehole seismic methods has been completed at surface and underground facilities in limestone, schist and salt. The identification of the damaged zone and the extent of stiffness modification from test results are outlined.
911232 Dipole-dipole electrical resistivity surveys of waste disposal study sites at Hill Air Force Base, Utah Ross, H P; Wright, P M; Mackleprang, C E Proe Symposium on Geology and Hydrology of HazardousWaste, Mimng-Waste, Waste-Water and Repositories Sites in Utah, Salt Lake City, 1989 P69-76. Publ Salt Lake City: Symposium and Field Conference, 1989 (Utah Geological Association Publication 17) Two large landfills and three waste disposal pits in the alluvial and Bonneville lakebed deposits have been surveyed using dipole-dipole electrical resistivity studies. The deposits contain fine grained silt and clay layers which prevent vertical movement of groundwater or contaminants. The configuration indicated an apparent range of resistivity which indicates nature of material, degree of saturation, and presence of or depth to clay layers. These data plus ground magnetic and self potential investigation can be used to plan detailed site investigation.
911233 Interpretation of seismic cone data using digital filtering techniques Campaneila, R G; Baziw, E J; Sully, A P Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 VI, P195-198. Publ Rotterdam: A A Balkema, 1989 In the seismic cone penetration test (SCPT), arrival of surface generated seismic waves is recorded by velocity or acceleration transducers in the piezocone. Instruments with fast response times are required to distinguish between different arrivals, but this sensitivity normally corresponds to noisy time domain characteristics. Digital filtering can be used to remove unwanted noise. The P-S CROSSCOR filtering program is described, which allows accurate and reliable velocity determination for polarised and nonpolarised waves. P-S CROSSCOR has been evaluated using real and synthetic data. Its use and comparison with the crossover method is illustrated.
911234 Computer-generated corelike descriptions from open-hole logs Anxionnaz, H; Delfiner, P: Delhomme, J P Bull Am Soc Petrol Geoi V74. N4, April 1990. P375-393 A method has been developed to integrate logging data into a consistent and logical geological description. Lithology is determined by comparing open hole measurements with a lithofacies database. Texture and structure are derived using dipmeter logs. Heterogeneities are identified by reference to a knowledge base describing characteristics of heterogeneities in relation to logging derived features. Results are merged to give a graphical and textural description to be used with core data as available. 911235 Sampling of saturated and unsaturated sands by freezing Konrad, J M Geotech Test d V13, N2, June 1990, P88-96 A prismatic (600mm by 100mm by 20mm) steel probe through which coolant at -40 deg C can be circulated has been developed to assist sampling of cohesionless soils. It can produce a frozen sand mass of diameter 260mm in 4 hours. It has been used successfully in saturated sands and also in unsaturated sands with imbibition to raise water content to a level to allow sufficient interparticle bonding. The disturbed zone on ground penetration is about 3-5 times the probe thickness. 911236 Sampling systems and methods for reconnaissance of marine placer minerals Woolsey, J R Marine Min I/8, N4, 1989, P349-363 Drill sampling is the most critical and costly phase of placer minerals exploration. Close drill sampling patterns and precision control are required. Further operational difficulties and costs arise if onshore techniques are used for marine placers. Three relatively inexpensive, rapid systems, which can be deployed from a variety of craft have been applied to offshore placer sampling. They are a modified airlift, a vibralift, incorporating the principles of the airlift but using a heavy duty pneumatic vibrator for driving power, and a modified vibralift with a rotary-percussion rock drill replacing the vibrator. 911237 Interpretation of piezocone tests in cohesive soils Sandven, R; Senneset, K; Janbu, N Proc 1st International Symposium o n Penetration Testing, ISOPT-I, Orlnado,20-24 March 1988 I/2, P939-953. Publ Rotterdam: A A Balkema, 1988 Piezocone tests (CPTU) are a promising way of obtaining realistic values of the effective shear strength parameters. Tests in cohesive soils, where undrained conditions are most likely around the cone tip during penetration, are analysed. A theoretical method for approximation of insitu preconsolidation pressure is presented, and applied to clays with different degrees of overconsolidation. Also, semi-empirical rules for approximation of compression moduli in clays are suggested.
Borehole and core logging
911238 Piezocone tests in silty soils Senneset, K; Sandven, R; Lunne, T; By, T; Amundsen, T Proc 1st International Symposium on Penetration Testing, ISOPT-I, Orlamto,20-24 March 1988 V2, P955-966. Publ Rotterdam: A A Balkema, 1988
See also: 911027, 911038, 911066, 911067, 911080, 911081, 911188,
Silty soils have until recently rarely been found for North Sea field developments. Consequently, almost all correlations developed between insitu test measurements and soil design
© 1991 Pergamon Press plc. Reproduction not permitted
911232 Dipole-dipole electrical resistivity surveys of waste disposal study sites at Hill Air Force Base, Utah Ross, H P; Wright, P M; Mackleprang, C E Proe Symposium on Geology and Hydrology of HazardousWaste, Mimng-Waste, Waste-Water and Repositories Sites in Utah, Salt Lake City, 1989 P69-76. Publ Salt Lake City: Symposium and Field Conference, 1989 (Utah Geological Association Publication 17) Two large landfills and three waste disposal pits in the alluvial and Bonneville lakebed deposits have been surveyed using dipole-dipole electrical resistivity studies. The deposits contain fine grained silt and clay layers which prevent vertical movement of groundwater or contaminants. The configuration indicated an apparent range of resistivity which indicates nature of material, degree of saturation, and presence of or depth to clay layers. These data plus ground magnetic and self potential investigation can be used to plan detailed site investigation.
911233 Interpretation of seismic cone data using digital filtering techniques Campaneila, R G; Baziw, E J; Sully, A P Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 VI, P195-198. Publ Rotterdam: A A Balkema, 1989 In the seismic cone penetration test (SCPT), arrival of surface generated seismic waves is recorded by velocity or acceleration transducers in the piezocone. Instruments with fast response times are required to distinguish between different arrivals, but this sensitivity normally corresponds to noisy time domain characteristics. Digital filtering can be used to remove unwanted noise. The P-S CROSSCOR filtering program is described, which allows accurate and reliable velocity determination for polarised and nonpolarised waves. P-S CROSSCOR has been evaluated using real and synthetic data. Its use and comparison with the crossover method is illustrated.
911234 Computer-generated corelike descriptions from open-hole logs Anxionnaz, H; Delfiner, P: Delhomme, J P Bull Am Soc Petrol Geoi V74. N4, April 1990. P375-393 A method has been developed to integrate logging data into a consistent and logical geological description. Lithology is determined by comparing open hole measurements with a lithofacies database. Texture and structure are derived using dipmeter logs. Heterogeneities are identified by reference to a knowledge base describing characteristics of heterogeneities in relation to logging derived features. Results are merged to give a graphical and textural description to be used with core data as available. 911235 Sampling of saturated and unsaturated sands by freezing Konrad, J M Geotech Test d V13, N2, June 1990, P88-96 A prismatic (600mm by 100mm by 20mm) steel probe through which coolant at -40 deg C can be circulated has been developed to assist sampling of cohesionless soils. It can produce a frozen sand mass of diameter 260mm in 4 hours. It has been used successfully in saturated sands and also in unsaturated sands with imbibition to raise water content to a level to allow sufficient interparticle bonding. The disturbed zone on ground penetration is about 3-5 times the probe thickness. 911236 Sampling systems and methods for reconnaissance of marine placer minerals Woolsey, J R Marine Min I/8, N4, 1989, P349-363 Drill sampling is the most critical and costly phase of placer minerals exploration. Close drill sampling patterns and precision control are required. Further operational difficulties and costs arise if onshore techniques are used for marine placers. Three relatively inexpensive, rapid systems, which can be deployed from a variety of craft have been applied to offshore placer sampling. They are a modified airlift, a vibralift, incorporating the principles of the airlift but using a heavy duty pneumatic vibrator for driving power, and a modified vibralift with a rotary-percussion rock drill replacing the vibrator. 911237 Interpretation of piezocone tests in cohesive soils Sandven, R; Senneset, K; Janbu, N Proc 1st International Symposium o n Penetration Testing, ISOPT-I, Orlnado,20-24 March 1988 I/2, P939-953. Publ Rotterdam: A A Balkema, 1988 Piezocone tests (CPTU) are a promising way of obtaining realistic values of the effective shear strength parameters. Tests in cohesive soils, where undrained conditions are most likely around the cone tip during penetration, are analysed. A theoretical method for approximation of insitu preconsolidation pressure is presented, and applied to clays with different degrees of overconsolidation. Also, semi-empirical rules for approximation of compression moduli in clays are suggested.
Borehole and core logging
911238 Piezocone tests in silty soils Senneset, K; Sandven, R; Lunne, T; By, T; Amundsen, T Proc 1st International Symposium on Penetration Testing, ISOPT-I, Orlamto,20-24 March 1988 V2, P955-966. Publ Rotterdam: A A Balkema, 1988
See also: 911027, 911038, 911066, 911067, 911080, 911081, 911188,
Silty soils have until recently rarely been found for North Sea field developments. Consequently, almost all correlations developed between insitu test measurements and soil design
© 1991 Pergamon Press plc. Reproduction not permitted