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Helical probe tests: initial test calibration
73A crosshole seismic measurements were used. The crosshole seismic method is seen as a precise method of determining in situ elastic properties. There are reservations about interpretation of laboratory dynamic tests due to the specimen size effects.
892183 Developments in computerised ground investigation data Greenwood, J R Ground Engng V21, N6, Sept 1988, P36-41
Borehole and core logging
An integrated computerised system was developed for storage and interpretation of geotechnical data. Using a microcomputer and a database,field and laboratory data are entered, and the computer produces final logs and test result sheets. Pilot work on the Bedford Bypass shows the system is cost effective, can produce logs in comparable time to manual systems and has potential for further analysis of data.
892179 Correlation between standard penetration test values and overburden pressure for desert sands. Note Ismael, N F; Jeragh, A M; Khalidi, O A; Mollah, M A Can Geotech J II25, N3, Aug 1988. P590-594 Field tests at five sites in Kuwait with different relative densities of surface soils were conducted to study the influence of effective overburden pressure on SPT values for calcareous desert sands. Correction factors for the SPT are determined and results compared with the most reliable data for clean silica sand.
892180 Helical probe tests: initial test calibration Yokel, F Y; Mayne, P W Geotech Test J VII, N3, Sept 1988, PI79-186 Helical probe (auger) tests using probes of different sizes have been investigated for application to compaction control and exploration of soils at shallow depths. The HPT is quick and simple, the torque required to set the probe being the measure of soil characteristics. Results of HPTs are compared and correlated with SPT, CPT, DMT, and in situ density test data. After calibration, the HPT may be used to measure relative compaction or in situ density of compacted soils.
892181 Self boring pressuremeter system Fahey, M; Jewell, R J; Brown, T A Geotech Test J VII, N3. Sept 1988, P187-194 Developments to the Cambridge University pressuremeter (Camkometer) at the University of Western Australia are described. Improvements to the pore pressure measuring system, de-airing of pore pressure transducers, supply voltage regulation and signal amplification systems in the instrument itself, microcomputer data logging, and a new membrane-protection system are discussed. Test results are presented which indicate that the output of pore pressure transducers provides information on the quality of drilling, especially in clays.
892182 Improved calibration and correction techniques for pressuremeters Murat, J R; Lemoigne, Y Geotech Test J VII, N3, Sept 1988, P195-203 Calibration tests were carried out with a monocell pressuremeter inserted into instrumented aluminium tubes of various lengths and diameters. Pressure distribution against the cavity wall at different levels of probe inflation was examined. Correlations were made between applied pressure, volume of fluid injection, and average probe diameter. An improved membrane reaction calibration and a correction for end effects are proposed. Influence of low temperatures on performance of the pressuremeter is also discussed.
892184 Sampling sand and gravel deposits. Field trials of three borehole methods Dixon, A J Quarry Manage Oct 1988, P45-52 Augering, bailing, and drive sampling were employed at two sites. Results are compared. All differ by varying degrees from paired face sample gradings. Drive sampling or dry drilling produces the greatest errors, with high fines content caused by pulverisation effects. Augered and bailed samples agree better with paired face samples, but were both comparatively gravel poor and sand rich. 892185 Static-penetration determination of the bearing capacity of piles in plastic-frozen soils lsaev, O N; Volkov, F E; Minkin, M A Soil Mech Found Engng V24, NS, Sept-Oct 1987, P194-198 As relaxation and creep of frozen soils are considerably slower than for unfrozen soils, problems arise when trying to apply results of penetration tests on frozen soils to foundation design using conventional analysis. Based on field tests, a relation has been developed to allow determination of a strength parameter for frozen soils, with temperature and properties of the soil and time since cessation of the penetration test allowed for. 892186 Geotechnical investigations at two NPP sites in Turkey Karpuz, C; Unal, E; Pasamehmetoglu, G; Tutuoglu, L Proc Symposium on Rock Mechanics and Power Plants, Madrid, 12-16 Sept 1988 VI. P71-83. Publ Rotterdam: A A Balkema, 1988 Investigations at the two sites, one of sedimentary, the other of igneous rocks, consisted of establishing a borehole drilling program, assessing the rock mass condition, and determining geotechnical parameters. Based on engineering geological evaluation and laboratory test results from cores, approximate locations of the two plants were decided. Engineering analysis was then carried out to evaluate settlements, stability of foundations and rock slopes, rippability or liquefaction potential as appropriate, under design loading, to determine the most suitable layouts of the plant. 892 ! 87 Pressuremeter tests in soft rocks Ul-Haq, I Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 VI, P137-138. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering, 1987 Three boreholes were drilled in claystone and sandstone rocks using the self boring pressuremeter. Because of the presence of hard lenses, the drilling bit of the SBP was modified to cut in advance of the pressuremeter, thus reducing the advantage of
,~ 1989 Pergamon Press plc. Reproduction not permitted
892183 Developments in computerised ground investigation data Greenwood, J R Ground Engng V21, N6, Sept 1988, P36-41
Borehole and core logging
An integrated computerised system was developed for storage and interpretation of geotechnical data. Using a microcomputer and a database,field and laboratory data are entered, and the computer produces final logs and test result sheets. Pilot work on the Bedford Bypass shows the system is cost effective, can produce logs in comparable time to manual systems and has potential for further analysis of data.
892179 Correlation between standard penetration test values and overburden pressure for desert sands. Note Ismael, N F; Jeragh, A M; Khalidi, O A; Mollah, M A Can Geotech J II25, N3, Aug 1988. P590-594 Field tests at five sites in Kuwait with different relative densities of surface soils were conducted to study the influence of effective overburden pressure on SPT values for calcareous desert sands. Correction factors for the SPT are determined and results compared with the most reliable data for clean silica sand.
892180 Helical probe tests: initial test calibration Yokel, F Y; Mayne, P W Geotech Test J VII, N3, Sept 1988, PI79-186 Helical probe (auger) tests using probes of different sizes have been investigated for application to compaction control and exploration of soils at shallow depths. The HPT is quick and simple, the torque required to set the probe being the measure of soil characteristics. Results of HPTs are compared and correlated with SPT, CPT, DMT, and in situ density test data. After calibration, the HPT may be used to measure relative compaction or in situ density of compacted soils.
892181 Self boring pressuremeter system Fahey, M; Jewell, R J; Brown, T A Geotech Test J VII, N3. Sept 1988, P187-194 Developments to the Cambridge University pressuremeter (Camkometer) at the University of Western Australia are described. Improvements to the pore pressure measuring system, de-airing of pore pressure transducers, supply voltage regulation and signal amplification systems in the instrument itself, microcomputer data logging, and a new membrane-protection system are discussed. Test results are presented which indicate that the output of pore pressure transducers provides information on the quality of drilling, especially in clays.
892182 Improved calibration and correction techniques for pressuremeters Murat, J R; Lemoigne, Y Geotech Test J VII, N3, Sept 1988, P195-203 Calibration tests were carried out with a monocell pressuremeter inserted into instrumented aluminium tubes of various lengths and diameters. Pressure distribution against the cavity wall at different levels of probe inflation was examined. Correlations were made between applied pressure, volume of fluid injection, and average probe diameter. An improved membrane reaction calibration and a correction for end effects are proposed. Influence of low temperatures on performance of the pressuremeter is also discussed.
892184 Sampling sand and gravel deposits. Field trials of three borehole methods Dixon, A J Quarry Manage Oct 1988, P45-52 Augering, bailing, and drive sampling were employed at two sites. Results are compared. All differ by varying degrees from paired face sample gradings. Drive sampling or dry drilling produces the greatest errors, with high fines content caused by pulverisation effects. Augered and bailed samples agree better with paired face samples, but were both comparatively gravel poor and sand rich. 892185 Static-penetration determination of the bearing capacity of piles in plastic-frozen soils lsaev, O N; Volkov, F E; Minkin, M A Soil Mech Found Engng V24, NS, Sept-Oct 1987, P194-198 As relaxation and creep of frozen soils are considerably slower than for unfrozen soils, problems arise when trying to apply results of penetration tests on frozen soils to foundation design using conventional analysis. Based on field tests, a relation has been developed to allow determination of a strength parameter for frozen soils, with temperature and properties of the soil and time since cessation of the penetration test allowed for. 892186 Geotechnical investigations at two NPP sites in Turkey Karpuz, C; Unal, E; Pasamehmetoglu, G; Tutuoglu, L Proc Symposium on Rock Mechanics and Power Plants, Madrid, 12-16 Sept 1988 VI. P71-83. Publ Rotterdam: A A Balkema, 1988 Investigations at the two sites, one of sedimentary, the other of igneous rocks, consisted of establishing a borehole drilling program, assessing the rock mass condition, and determining geotechnical parameters. Based on engineering geological evaluation and laboratory test results from cores, approximate locations of the two plants were decided. Engineering analysis was then carried out to evaluate settlements, stability of foundations and rock slopes, rippability or liquefaction potential as appropriate, under design loading, to determine the most suitable layouts of the plant. 892 ! 87 Pressuremeter tests in soft rocks Ul-Haq, I Proc Eighth Asian Regional Conference on Soil Mechanics and Foundation Engineering, Kyoto, 20-24 July 1987 VI, P137-138. Publ Japan: Japanese Society for Soil Mechanics and Foundation Engineering, 1987 Three boreholes were drilled in claystone and sandstone rocks using the self boring pressuremeter. Because of the presence of hard lenses, the drilling bit of the SBP was modified to cut in advance of the pressuremeter, thus reducing the advantage of
,~ 1989 Pergamon Press plc. Reproduction not permitted