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Pushed thinwalled tube sampling system for stiff clays
294A 915226 In situ rapid assessment of dynamic soil characteristics for microzonation investigations
915230 Calibration of a dynamic penetrometer for compaction quality control of boiler slag
Tselentis, GA; Delis, G Proc 6th InrerRurio& Congress lnternrrrional Association of Engineering Geology, Amsrerabm, 6-10 Augusr 1990 V2, P893-897. Pub1 Rotterdam: A A Balkema, 1990
Acar, Y B; Puppula, A J; Seals, R K Georech Test J V14, NI, March 1991, P56-63
A geophysical technique using a digital multichannel seismograph and a portable microcomputer with a series of equally spaced geophones is described. First seismic arrivals plus later arriving surface waves are analysed. Surface wave dispersion curves are automatically inverted to obtain shear wave velocity and modulus of each sublayer. Data acquisition and analysis are discussed with some examples.
Laboratory and field calibration tests were used to study the effect of density on dynamic penetration resistance of fills of boiler slag, using a specially developed dynamic penetrometer. Effects of specimen preparation method and saturation were studied in the laboratory. Dynamic penetration resistance and density were recorded at a test fill after O-16 passes of a smooth drum vibratory roller. Field and laboratory results are compared. Charts are presented to assist selection of lift height/number of passes for use in field quality control of boiler slag fills.
915227 Radio magnetotelhwics apparent resistivity high velocity continuous profiling for shallow works
Chevassu, G; Lagabrielle, R Proc 6rh International Congress International Association of Engineering Geology, Amsrerdam, 6-10 Angusr 1990 V2, P899-905. Pub1 Rotterdam: A A Balkema. 1990 Continuous measurement of lateral variations of apparent resistivity can provide a low cost, efficient, and productive method for shallow civil engineering site surveys. A radiomagnetotelluric (RMT) device has been developed which can survey at speeds in the range 3-30km/h. Two examples of its use are presented, survey of shallow trench sites and of a road subbase. 915228 Assessment of seismic tomography as a means of detecting voids in salt deposits
Clayton, C RI; Gunn. M J; Hope, V S; Matthews, M C; McDowell, P W Proc 6rh International Congress International Association of Engineering Geology, Amsterdam, 6-10 Augusr 1990 V2. P907-912. Pub1 Rotterdam: A A Balkema, 1990 Application of P wave tomography in marl and salt deposits is described. Crosshole tomography is useful for determining spatial velocity and stiffness distributions. Data acquisition, methods of tomographic reconstruction, and results of analyses are discussed. Known geological features are seen to be readily recovered. Modelling has been shown to be of considerable use in interpretation of reconstructed velocity fields.
Borehole and core logging
915231 Small diameter piston sampling with cone penetrometer equipment. Technical note
Kay, J N Georech Tesr J V14, Nl. March 1991. P108-109 A small diameter piston sampler which can be used with a cone penetrometer rig under conditions where sample recovery by conventional means is difficult is described. The 22mm diameter samples are recovered in a polyethylene sheath and are suited for visual rather than mechanical examination. Essentially 100% recovery was obtained in initial tests on soft, wet interlayered clays and sands which could not be recovered by open tube samplers.
915232 Pushed thinwalled tube sampling system for stiff clays Harrison, I R Ground Engng V24, N3. April 1991. P30-34 The recent applications of triaxial small strain and suction tests on overconsolidated cohesive soils have resulted in demand for high quality thinwall pushed tube samples to replace standard driven UlOO tube samples of limited quality. A recently developed rig for recovering samples of London Clay with undrained shear strength up to 250kN is illustrated and the sampling procedure described. The compact rig can retrieve samples of minimum useable length 400mm with continuous steady thrust, and thrust force and penetration are monitored throughout the sequence.
See also: 915025, 915026, 915032, 915061, 915158, 915387 915229 Practical model for organic richness from porosity and resistivity logs
915233 Soil gases in geothermal prospecting: two case histories (Sabatini volcanoes and Alban Hills, Latium, Central Hills)
Passey, Q R; Creaney, S; Kulla, J B; Moretti, F J; Stroud, J D BnU Am Assoc Petrol Geol V74, Nl2, Dee 1990. P1777-1794
Bertrami, R; Buonasorte, G; Ceccarelli, A; Lombardi, S; Pieri, S; Scandiffio, G J Geophys Res V95, NB13, Dee 1990. P21475-21481
A method involving overlays of porosity logs and resistivity curves has been developed for identifying and quantifying total organic carbon in organic rich rocks. In water saturated, organic lean rocks, the two curves are parallel, but a separation occurs in hydrocarbon reservoir rocks or organic rich non-reservoir rocks. Reservoir intervals can be identified and eliminated from the analysis using gamma ray curves. The magnitude of separation in non-reservoir rocks can be calibrated to total organic content and maturity, to allow depth profiling for organic richness in absence of sample data. 0
The effectiveness of soil gas surveying in locating permeable zones in buried carbonate reservoirs or locating the presence of gaseous haloes linked to active geothermal systems has been examined in two areas of thermal anomaly. In one case contents of carbon dioxide, hydrogen, helium,and methane in soil gases were analysed, in the other helium content of soil gas and water samples. Anomalous concentrations were mostly associated with faults and fracture systems, suggesting gas analysis may be used as an indicator of deep permeability.
1991 Pergamon Press plc. Reproduction
not permitted
915230 Calibration of a dynamic penetrometer for compaction quality control of boiler slag
Tselentis, GA; Delis, G Proc 6th InrerRurio& Congress lnternrrrional Association of Engineering Geology, Amsrerabm, 6-10 Augusr 1990 V2, P893-897. Pub1 Rotterdam: A A Balkema, 1990
Acar, Y B; Puppula, A J; Seals, R K Georech Test J V14, NI, March 1991, P56-63
A geophysical technique using a digital multichannel seismograph and a portable microcomputer with a series of equally spaced geophones is described. First seismic arrivals plus later arriving surface waves are analysed. Surface wave dispersion curves are automatically inverted to obtain shear wave velocity and modulus of each sublayer. Data acquisition and analysis are discussed with some examples.
Laboratory and field calibration tests were used to study the effect of density on dynamic penetration resistance of fills of boiler slag, using a specially developed dynamic penetrometer. Effects of specimen preparation method and saturation were studied in the laboratory. Dynamic penetration resistance and density were recorded at a test fill after O-16 passes of a smooth drum vibratory roller. Field and laboratory results are compared. Charts are presented to assist selection of lift height/number of passes for use in field quality control of boiler slag fills.
915227 Radio magnetotelhwics apparent resistivity high velocity continuous profiling for shallow works
Chevassu, G; Lagabrielle, R Proc 6rh International Congress International Association of Engineering Geology, Amsrerdam, 6-10 Angusr 1990 V2, P899-905. Pub1 Rotterdam: A A Balkema. 1990 Continuous measurement of lateral variations of apparent resistivity can provide a low cost, efficient, and productive method for shallow civil engineering site surveys. A radiomagnetotelluric (RMT) device has been developed which can survey at speeds in the range 3-30km/h. Two examples of its use are presented, survey of shallow trench sites and of a road subbase. 915228 Assessment of seismic tomography as a means of detecting voids in salt deposits
Clayton, C RI; Gunn. M J; Hope, V S; Matthews, M C; McDowell, P W Proc 6rh International Congress International Association of Engineering Geology, Amsterdam, 6-10 Augusr 1990 V2. P907-912. Pub1 Rotterdam: A A Balkema, 1990 Application of P wave tomography in marl and salt deposits is described. Crosshole tomography is useful for determining spatial velocity and stiffness distributions. Data acquisition, methods of tomographic reconstruction, and results of analyses are discussed. Known geological features are seen to be readily recovered. Modelling has been shown to be of considerable use in interpretation of reconstructed velocity fields.
Borehole and core logging
915231 Small diameter piston sampling with cone penetrometer equipment. Technical note
Kay, J N Georech Tesr J V14, Nl. March 1991. P108-109 A small diameter piston sampler which can be used with a cone penetrometer rig under conditions where sample recovery by conventional means is difficult is described. The 22mm diameter samples are recovered in a polyethylene sheath and are suited for visual rather than mechanical examination. Essentially 100% recovery was obtained in initial tests on soft, wet interlayered clays and sands which could not be recovered by open tube samplers.
915232 Pushed thinwalled tube sampling system for stiff clays Harrison, I R Ground Engng V24, N3. April 1991. P30-34 The recent applications of triaxial small strain and suction tests on overconsolidated cohesive soils have resulted in demand for high quality thinwall pushed tube samples to replace standard driven UlOO tube samples of limited quality. A recently developed rig for recovering samples of London Clay with undrained shear strength up to 250kN is illustrated and the sampling procedure described. The compact rig can retrieve samples of minimum useable length 400mm with continuous steady thrust, and thrust force and penetration are monitored throughout the sequence.
See also: 915025, 915026, 915032, 915061, 915158, 915387 915229 Practical model for organic richness from porosity and resistivity logs
915233 Soil gases in geothermal prospecting: two case histories (Sabatini volcanoes and Alban Hills, Latium, Central Hills)
Passey, Q R; Creaney, S; Kulla, J B; Moretti, F J; Stroud, J D BnU Am Assoc Petrol Geol V74, Nl2, Dee 1990. P1777-1794
Bertrami, R; Buonasorte, G; Ceccarelli, A; Lombardi, S; Pieri, S; Scandiffio, G J Geophys Res V95, NB13, Dee 1990. P21475-21481
A method involving overlays of porosity logs and resistivity curves has been developed for identifying and quantifying total organic carbon in organic rich rocks. In water saturated, organic lean rocks, the two curves are parallel, but a separation occurs in hydrocarbon reservoir rocks or organic rich non-reservoir rocks. Reservoir intervals can be identified and eliminated from the analysis using gamma ray curves. The magnitude of separation in non-reservoir rocks can be calibrated to total organic content and maturity, to allow depth profiling for organic richness in absence of sample data. 0
The effectiveness of soil gas surveying in locating permeable zones in buried carbonate reservoirs or locating the presence of gaseous haloes linked to active geothermal systems has been examined in two areas of thermal anomaly. In one case contents of carbon dioxide, hydrogen, helium,and methane in soil gases were analysed, in the other helium content of soil gas and water samples. Anomalous concentrations were mostly associated with faults and fracture systems, suggesting gas analysis may be used as an indicator of deep permeability.
1991 Pergamon Press plc. Reproduction
not permitted