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Disturbances due to ‘ideal’ tube sampling
7A 881049 Disturlmnccs due to 'ideal' tube sampling Bahgh, M M, Azzouz, A S, Chm, C T
J Geotecli Emgsg Di~ A$CE VII3. N7, July 1987. P739-757 An Ideal samphng approach (ISA) Is proposed to describe mtmmum d~sturbance effects m deep tube samples of saturated clays It rehes on approxamate solutions based on the strata path method to incorporate tube penetratton disturbances Laboratory test results mdlcate the ISA provtdes more reahstic predictions of dtsturbance than the exxstmg perfect samphng approach, and that tube penetration dtsturbance Is stgmficant m 'undtsturbed' thm wall tube sampled soft clays 881050 Rotation of principal directions in Ko-consolidated clay Hicher, P Y, Lade, P V
J Geoteck Engng Die ASCE VII3, N7, July 1987. P774-788 The mfluences of changes m ortentatlon of prmclpal stress direction on the behavlour of Ko-consohdated clay have been examined Undramed torsion shear tests wtth monotonic and cyclic Ioadmg were carned out on hollow cyhnder specimens Results were compared with those from cubic tnaxlal tests, where the same stress paths were followed but no rotation of the prmclpal stress took place It was possible to separate the mfluence of stress rotation on stress-stram, pore pressure, and shear strength relattonshlps 881051 Effects of stress history on ballast deformation. Technical note Dlyaljee, V A
J Geotech Engng Dw ASCE VII3. N8. Aug 1987. P909-914 A single density, smgle gradatton ballast was subjected to stogie stage, variable and progressively increasing Ioadmgs at an effective confining pressure of 35kN/sq m, m an attempt to simulate field loading Behavlour was different from that of similar samples subject to a stogie magnitude of stress dtfference or deviator stress Prestressing by progressively mcreasmg loadmgs reduced rate and magnitude of plasttc deformation and increased the threshold stress For stresses less than 50% of the static deviator stress, application of a high load prtor to subsequent application of a low load resulted m negligible plastic strum 881052 Some aspects of the hehaviour of non-saturated soils (In French) Delage, P
Rev Fr Geotech N40. 1987. P33-43 The basic concepts of the behavlour of unsaturated soils are mtroduced wtth reference to pubhshed work Soil suction, water retention, fluid flow, and permeabdlty and its changes with saturation are constdered The effective stress concept Is mtroduced and applied to consolidation, compresston, and shear strength Unsaturated soil behavlour is a complex phenomenon for whtch there is insufficient expertmental data to provide complete understanding of problems In earth structures subject to moisture content change 881053 New modified borehole jack for stiff rock Azzam, R, Bock, H
Rock Mech Rock Engng V20. N3. July-Sept 1987. P!91-211 A new jack statable for use with the modified jackmg method of De La Cruz (1978) is described It has recoverable sensors to measure tangential strata at borehole walls, and can
develop extra lugh load outputs Common and modified jackmg theories and mterpretatlons are compared Results of m sltu tests usmg both common and modtfied jacks at a major damslte are presented, together wtth those from conventtonal laboratory tests on cores, and dtscussed with conslderauon of particular rock conditions at the s~te 881054 Numerical analysis of soils in simple shear devices Budhu, M, Bntto, A
Soils Found V27. N2. June 1987, P31-41 The fintte element program CRISP was used to analyse stmple shear tests on sods modelled etther as elastic or elastoplasuc materials Elastic analysis produces larger levels of stress concentratlon than that usmg a modified Cam-clay model Stress strain behawour of kaolin and loose sand predicted using the Cam-clay model agrees well wtth experimental results for constant load tests, but not for constant height tests Interpretation of results from simple shear devtces ts considered 881055 Drained-strength parameters from direct shear tests for slope stability analyses in overconsolidated fissured residual soils Borden, R H, Putnch, S F
Trans Res Rec N1089, 1986. P102-113 Dramed d~rect shear tests were earned out on soils from three sites m North Carolina, USA, using specimens trimmed from block samples Postpeak strength was studied Strength reduction wtth increasing displacement conformed wtth other reported data for overconsohdated soils Residual friction angle tended to decrease with increasing plasttctty index Results suggest that drained shear strength parameters and effective stress analyses should be used m slope analysis of overconsohdated sods 881056 Influence of the testing technique on the pore water pressure development in clay under wave loading De Campos, T M P
Proc 5tk International Symposium on Offshore Engineering, R¢o de Janewo, 16-20 September 1985 VS. P225-237 Publ London Pentech. 1986 Pore pressure development m clayey soils under cyclic and repeated loading undramed tnaxlal tests was studied The varIation of pore pressure with number of cycles or Ioadmgs was determined at the specimen base and at midhetght periphery The effect of inertia-reduced creep when testmg between Ioadings was also examined The results are d~scussed with reference to wave loadmg of offshore structures 881057 Microcomputer stress path testing and data analysis system for research and practice Woods, R I, Chnton, D B
Proc Symposium on Computer Applications in Geoteclmical Engineering, Birmingham, April 1986 P137-145 Publ Btrmmgham Midlands Geotechlcal Soctety, 1986 Tnaxlal stress path testmg subjects sod to conditions closely related to those m the ground, and reahsUc strength and stiffness parameters can be obtamed Recent advances m microcomputers allow sophisticated control systems for stress path testmg to be produced at reasonable cost A stress path testing system Is described, and results from tests on a heavily overconsohdated clay presented
© 1988 Pergamon Press plc Reproduction not permitted
J Geotecli Emgsg Di~ A$CE VII3. N7, July 1987. P739-757 An Ideal samphng approach (ISA) Is proposed to describe mtmmum d~sturbance effects m deep tube samples of saturated clays It rehes on approxamate solutions based on the strata path method to incorporate tube penetratton disturbances Laboratory test results mdlcate the ISA provtdes more reahstic predictions of dtsturbance than the exxstmg perfect samphng approach, and that tube penetration dtsturbance Is stgmficant m 'undtsturbed' thm wall tube sampled soft clays 881050 Rotation of principal directions in Ko-consolidated clay Hicher, P Y, Lade, P V
J Geoteck Engng Die ASCE VII3, N7, July 1987. P774-788 The mfluences of changes m ortentatlon of prmclpal stress direction on the behavlour of Ko-consohdated clay have been examined Undramed torsion shear tests wtth monotonic and cyclic Ioadmg were carned out on hollow cyhnder specimens Results were compared with those from cubic tnaxlal tests, where the same stress paths were followed but no rotation of the prmclpal stress took place It was possible to separate the mfluence of stress rotation on stress-stram, pore pressure, and shear strength relattonshlps 881051 Effects of stress history on ballast deformation. Technical note Dlyaljee, V A
J Geotech Engng Dw ASCE VII3. N8. Aug 1987. P909-914 A single density, smgle gradatton ballast was subjected to stogie stage, variable and progressively increasing Ioadmgs at an effective confining pressure of 35kN/sq m, m an attempt to simulate field loading Behavlour was different from that of similar samples subject to a stogie magnitude of stress dtfference or deviator stress Prestressing by progressively mcreasmg loadmgs reduced rate and magnitude of plasttc deformation and increased the threshold stress For stresses less than 50% of the static deviator stress, application of a high load prtor to subsequent application of a low load resulted m negligible plastic strum 881052 Some aspects of the hehaviour of non-saturated soils (In French) Delage, P
Rev Fr Geotech N40. 1987. P33-43 The basic concepts of the behavlour of unsaturated soils are mtroduced wtth reference to pubhshed work Soil suction, water retention, fluid flow, and permeabdlty and its changes with saturation are constdered The effective stress concept Is mtroduced and applied to consolidation, compresston, and shear strength Unsaturated soil behavlour is a complex phenomenon for whtch there is insufficient expertmental data to provide complete understanding of problems In earth structures subject to moisture content change 881053 New modified borehole jack for stiff rock Azzam, R, Bock, H
Rock Mech Rock Engng V20. N3. July-Sept 1987. P!91-211 A new jack statable for use with the modified jackmg method of De La Cruz (1978) is described It has recoverable sensors to measure tangential strata at borehole walls, and can
develop extra lugh load outputs Common and modified jackmg theories and mterpretatlons are compared Results of m sltu tests usmg both common and modtfied jacks at a major damslte are presented, together wtth those from conventtonal laboratory tests on cores, and dtscussed with conslderauon of particular rock conditions at the s~te 881054 Numerical analysis of soils in simple shear devices Budhu, M, Bntto, A
Soils Found V27. N2. June 1987, P31-41 The fintte element program CRISP was used to analyse stmple shear tests on sods modelled etther as elastic or elastoplasuc materials Elastic analysis produces larger levels of stress concentratlon than that usmg a modified Cam-clay model Stress strain behawour of kaolin and loose sand predicted using the Cam-clay model agrees well wtth experimental results for constant load tests, but not for constant height tests Interpretation of results from simple shear devtces ts considered 881055 Drained-strength parameters from direct shear tests for slope stability analyses in overconsolidated fissured residual soils Borden, R H, Putnch, S F
Trans Res Rec N1089, 1986. P102-113 Dramed d~rect shear tests were earned out on soils from three sites m North Carolina, USA, using specimens trimmed from block samples Postpeak strength was studied Strength reduction wtth increasing displacement conformed wtth other reported data for overconsohdated soils Residual friction angle tended to decrease with increasing plasttctty index Results suggest that drained shear strength parameters and effective stress analyses should be used m slope analysis of overconsohdated sods 881056 Influence of the testing technique on the pore water pressure development in clay under wave loading De Campos, T M P
Proc 5tk International Symposium on Offshore Engineering, R¢o de Janewo, 16-20 September 1985 VS. P225-237 Publ London Pentech. 1986 Pore pressure development m clayey soils under cyclic and repeated loading undramed tnaxlal tests was studied The varIation of pore pressure with number of cycles or Ioadmgs was determined at the specimen base and at midhetght periphery The effect of inertia-reduced creep when testmg between Ioadings was also examined The results are d~scussed with reference to wave loadmg of offshore structures 881057 Microcomputer stress path testing and data analysis system for research and practice Woods, R I, Chnton, D B
Proc Symposium on Computer Applications in Geoteclmical Engineering, Birmingham, April 1986 P137-145 Publ Btrmmgham Midlands Geotechlcal Soctety, 1986 Tnaxlal stress path testmg subjects sod to conditions closely related to those m the ground, and reahsUc strength and stiffness parameters can be obtamed Recent advances m microcomputers allow sophisticated control systems for stress path testmg to be produced at reasonable cost A stress path testing system Is described, and results from tests on a heavily overconsohdated clay presented
© 1988 Pergamon Press plc Reproduction not permitted