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Pore pressure effects in boreshore shear testing
230A miniaturised nuclear backscatter probe for density measurement, expendable seabed penetrators, and sea bed drive systems are introduced.
885224 Recent developments in sampling of granular soils in Japan Moil, H Proe 4th International Geotedmical Seminar, Field Instrumentation and ln-situ Measurements, Singapore, 25-27 November 1986 P13-20. Publ Singapore: NT[, 1986 Techniques for sampling with minimum disturbance for granular soils, sands, gravels, residual and volcanic soils are presented. Methods include large diameter tube sampling for coarse materials, block sampling,total and limited depth freezing, and air flush drilling, which is used when it is imperative not to upset the water content and chemical properties of a soil. Equipment, applications and examples are described.
885225 Penetration tests Broms, B B Proc 4tk International Geoteehnical Seminar, Field Instrumentation and ln-situ Measurements, Singapore, 25-27 November 1986 P21-49. Publ Singapore: NT1, 1986 Penetration tests are widely used in exploratory site investigation and to assess compressibility of different strata for foundation design. The most common methods, standard penetration test (SPT), cone penetration test (CPT), and ram sounding tests (DPA and DPB), are described in some detail. Evaluation of vertical effective stress, relative density, friction angle, liquefaction potential, settlement, and bearing capacity is discussed with reference to field measurements. 158 refs.
885226 Evaluation of deformation and bearing capacity parameters of foundations, from static CPT-results Van lmpe, W F Proc 4th International Geotechnical Seminar, Field Instrumentation and ln-situ Measurements, Singapore, 25-27 November 1986 P51-70. Publ Singapore: NTI, 1986 Cone penetrometer design is illustrated and the qualitative and quantitative uses of the CPT in cohesive and cohesionless soils are described. Interpretation of results to determine drained and undrained shear strength, elastic parameters, and bearing capacity and settlement of shallow and pile foundations is discussed. Reliable results can be obtained from correct interpretation of CPTs, but data from other tests should also be taken into account.
885227 Acoustic penetration testing Massarsch, R Proc 4th International Geotechnical Seminar, Field Instrumentation and In-situ Measurements, Singapore, 25-27 November 1986 P71-76. Publ Singapore: NTI, 1986 A prototype instrument, which incorporates a sensitive acoustic sensor attached to a needle at the tip of a conventional cone penetrometer, is described. The sensor works at high frequency (200 kHz) and detects changes in acoustic emission as the cone penetrates the soil. Field tests in soft varved clays are described. The high resolution instrument can detect very thin (lmm) layers of sand and silt.
885228 Laboratory and field evaluation of cone penetrometers Lunne, T; Eidsmoen, T; Gillespie, D; Howland, J D In: Use of In Situ Tests in Geoteehnical Engineering (papers to the Conference, Biacksbarg, 23-25 June 1986) P714-729. Publ New York: ASCE, 1986 ( ASCE Geotechnical Special Publication No 6) Cone penetrometers from eight organisations were evaluated by testing in the laboratory and at reference field sites, in order to determine factors affecting the accuracy of the instrument and repeatability of results. Pore pressure and temperature zero shift had greatest effects on uncorrected cone resistance and sleeve friction. Different cones, all adhering to European standards, gave widely differing results. Correction for pore pressure and temperature zero shift effects significantly reduces differences in cone resistances from different cones, and has similar but lesser effect on sleeve friction values. 885229 In situ tests with Ko Stepped Blade Lutenegger, A J; Timian, D A In: Use of In Situ Tests in Geotechnical Engineering (papers to the Conference, Biacksburg, 23-25 June 1986) P730-751. Publ New York: ASCE, 1986 (ASCE Geotechnical Special Publication No 6) r Field tests using the Ko Stepped Blade penetrometer in a variety of cohesive soils to determine lateral stress and soil mechanical properties are reported. Ko values from soft to medium consistency clays agree well with those from other laboratory and in situ measurements, but unreasonably high values are found for overconsolidated soils. Before the Stepped Blade becomes a practical tool, the role of pore pressure generation during testing must be examined. 88523O Pore pressure effects in borehole shear testing Lutenegger, A J; Tierney, K F In: Use of In Situ Tests in Geotechnical Engineering (papers to the Conference, Blacksburg, 23-25 June 1986) P752-764. Publ New York: ASCE, 1986 (ASCE Geotechnical Special Publication No 6) The effects of excess pore pressure on shear strengths of saturated clays obtained using the Borehole Shear Test have been investigated. Pore pressures were measured during consolidation, shear, and post shear phases of stage and fresh shear tests. Results indicate higher pore pressures were generated from fresh shearing. Twenty minutes consolidation time was needed to dissipate excess pore pressures. Effective shear strength parameters were evaluated using pore pressures measured during shearing. 885231 CPT indexing of in situ OCR in clays Mayne, P W In: Use of In Situ Tests in Geotechnical Engineering (papers to the Conference, Blacksburg, 23-25 June 1986) P780-793. Publ New York: ASCE. 1986 (ASCE Geotechnical Special Publication No 6) Overconsolidation ratio (OCR) is a very important parameter governing the behaviour of clay deposits. A theoretical basis for determining OCR from cone penetration test (CPT) data is presented, together with correlation based on results of field and laboratory testing. Site specific calibration of the cone with oedometer tests is recommended. Field tests indicate that excess pore pressure measured during cone penetration provides an independent evaluation of in situ OCR.
© 1988 Pergamon Press plc. Reproduction not permitted
885224 Recent developments in sampling of granular soils in Japan Moil, H Proe 4th International Geotedmical Seminar, Field Instrumentation and ln-situ Measurements, Singapore, 25-27 November 1986 P13-20. Publ Singapore: NT[, 1986 Techniques for sampling with minimum disturbance for granular soils, sands, gravels, residual and volcanic soils are presented. Methods include large diameter tube sampling for coarse materials, block sampling,total and limited depth freezing, and air flush drilling, which is used when it is imperative not to upset the water content and chemical properties of a soil. Equipment, applications and examples are described.
885225 Penetration tests Broms, B B Proc 4tk International Geoteehnical Seminar, Field Instrumentation and ln-situ Measurements, Singapore, 25-27 November 1986 P21-49. Publ Singapore: NT1, 1986 Penetration tests are widely used in exploratory site investigation and to assess compressibility of different strata for foundation design. The most common methods, standard penetration test (SPT), cone penetration test (CPT), and ram sounding tests (DPA and DPB), are described in some detail. Evaluation of vertical effective stress, relative density, friction angle, liquefaction potential, settlement, and bearing capacity is discussed with reference to field measurements. 158 refs.
885226 Evaluation of deformation and bearing capacity parameters of foundations, from static CPT-results Van lmpe, W F Proc 4th International Geotechnical Seminar, Field Instrumentation and ln-situ Measurements, Singapore, 25-27 November 1986 P51-70. Publ Singapore: NTI, 1986 Cone penetrometer design is illustrated and the qualitative and quantitative uses of the CPT in cohesive and cohesionless soils are described. Interpretation of results to determine drained and undrained shear strength, elastic parameters, and bearing capacity and settlement of shallow and pile foundations is discussed. Reliable results can be obtained from correct interpretation of CPTs, but data from other tests should also be taken into account.
885227 Acoustic penetration testing Massarsch, R Proc 4th International Geotechnical Seminar, Field Instrumentation and In-situ Measurements, Singapore, 25-27 November 1986 P71-76. Publ Singapore: NTI, 1986 A prototype instrument, which incorporates a sensitive acoustic sensor attached to a needle at the tip of a conventional cone penetrometer, is described. The sensor works at high frequency (200 kHz) and detects changes in acoustic emission as the cone penetrates the soil. Field tests in soft varved clays are described. The high resolution instrument can detect very thin (lmm) layers of sand and silt.
885228 Laboratory and field evaluation of cone penetrometers Lunne, T; Eidsmoen, T; Gillespie, D; Howland, J D In: Use of In Situ Tests in Geoteehnical Engineering (papers to the Conference, Biacksbarg, 23-25 June 1986) P714-729. Publ New York: ASCE, 1986 ( ASCE Geotechnical Special Publication No 6) Cone penetrometers from eight organisations were evaluated by testing in the laboratory and at reference field sites, in order to determine factors affecting the accuracy of the instrument and repeatability of results. Pore pressure and temperature zero shift had greatest effects on uncorrected cone resistance and sleeve friction. Different cones, all adhering to European standards, gave widely differing results. Correction for pore pressure and temperature zero shift effects significantly reduces differences in cone resistances from different cones, and has similar but lesser effect on sleeve friction values. 885229 In situ tests with Ko Stepped Blade Lutenegger, A J; Timian, D A In: Use of In Situ Tests in Geotechnical Engineering (papers to the Conference, Biacksburg, 23-25 June 1986) P730-751. Publ New York: ASCE, 1986 (ASCE Geotechnical Special Publication No 6) r Field tests using the Ko Stepped Blade penetrometer in a variety of cohesive soils to determine lateral stress and soil mechanical properties are reported. Ko values from soft to medium consistency clays agree well with those from other laboratory and in situ measurements, but unreasonably high values are found for overconsolidated soils. Before the Stepped Blade becomes a practical tool, the role of pore pressure generation during testing must be examined. 88523O Pore pressure effects in borehole shear testing Lutenegger, A J; Tierney, K F In: Use of In Situ Tests in Geotechnical Engineering (papers to the Conference, Blacksburg, 23-25 June 1986) P752-764. Publ New York: ASCE, 1986 (ASCE Geotechnical Special Publication No 6) The effects of excess pore pressure on shear strengths of saturated clays obtained using the Borehole Shear Test have been investigated. Pore pressures were measured during consolidation, shear, and post shear phases of stage and fresh shear tests. Results indicate higher pore pressures were generated from fresh shearing. Twenty minutes consolidation time was needed to dissipate excess pore pressures. Effective shear strength parameters were evaluated using pore pressures measured during shearing. 885231 CPT indexing of in situ OCR in clays Mayne, P W In: Use of In Situ Tests in Geotechnical Engineering (papers to the Conference, Blacksburg, 23-25 June 1986) P780-793. Publ New York: ASCE. 1986 (ASCE Geotechnical Special Publication No 6) Overconsolidation ratio (OCR) is a very important parameter governing the behaviour of clay deposits. A theoretical basis for determining OCR from cone penetration test (CPT) data is presented, together with correlation based on results of field and laboratory testing. Site specific calibration of the cone with oedometer tests is recommended. Field tests indicate that excess pore pressure measured during cone penetration provides an independent evaluation of in situ OCR.
© 1988 Pergamon Press plc. Reproduction not permitted