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Development of pore pressure and material damping during cyclic loading
10A 931070
931074
Stresses, displacements, volume changes around the expansion cylinder in the soil
Evaluation of tertiary age gravel deposits using plate load tests
Mecsi, J Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, P243246. Publ Rotterdam." A A Balkema, 1991
Ervin, M C; Kurzeme, M Proc 6tb Australia-New Zealand Conference on Geomechunics, Christchurch, 3-7 February 1992 P319-323. Publ New Zealand." New Zealand Geomechanics Society. 1992
The problem of expansion of an underground cylindrical cavity in a soil mass may arise in analysis of deep pile foundations, grouted tension anchors, or pressuremeter tests. A method to calculate the stress and strain conditions around an expanding cavity in a cohesive or granular soil is presented. Plastic stress state, nonlinear strain conditions, and volume strain inside the plastic stress zone are evaluated. The stress component changes depend on the compression or tension state of the soil within and outside the plastic stress zone.
Planned refurbishment of an 8 storey building with a single basement level indicated increased foundation loads of up to 30%, exceeding the original design values. Some footings were found to be on several metres of gravelly soil, rather than siltstone as previously assumed. Plate load tests, using the existing structure as a reaction frame, were adopted to assess deformation properties of the gravel deposit. Applied stresses of up to 1500kPa were used and Young's modulus up to 300MPa measured. Settlements due to the increased loads were confidently predicted on the basis of these results. 931075
931071
Screw plate insertion disturbance in sand Brown, P T; Abdel-Latif, M F Proc 6th Australia-New Zealand Conference on Geomechunics, Christchurch, 3-7 February 1992 P302-304. Publ New Zealand." New Zealand Geomechanics Society, 1992 The screw plate test was developed to overcome some of the disadvantages of the flat plate loading tests. Laboratory tests are described which used a screw plate embedded in sand during the process of sand raining and a screw plate inserted under control of a threaded rod of the same pitch as the screw plate. Young's moduli from the two setups are compared and an estimate of the effects of insertion disturbance on the results is made.
931072
Screw plate insertion disturbance in clay Brown, P T; Abdel-Latif, M F Proc 6th Australia-New Zealand Conference on
Geomechunics, Christchurch, 3-7 February 1992 P305-308. Publ New Zealand: New Zealand Geomechanics Society, 1992 Laboratory tests are described which used a flat plate and a screw plate embedded in kaolin clay consolidated from a slurry and a screw plate inserted under control of a threaded rod of the same pitch as the screw plate. Values of Young's modulus and coefficient of consolidation obtained are compared and an estimate made of the effects of insertion disturbance on the results.
Normalised shear strength and compressibility characteristics of Adelaide expansive clay Kaggwa, W S; Jaksa, M B Proc 6th Australia-New Zealand Conference on
Geomechunics, Christchurch, 3-7 February 1992 P330-335. Pub/New Zealand: New Zealand Geomechanics Society,, 1992 Available field and laboratory data on the undrained shear strength and compressibility of Adelaide clays, in particular Keswick Clay, have been collected. Undrained shear strength and Young's modulus have been related to the effective stress state in the soil mass using analyses which take into account soil suction. Despite the wide variation of the values of these properties attributable to the variable stress state in the soil mass and inherent variability of the clay, the normalised values are consistent with those of overconsolidated clays acted on by positive pore pressure. 931076
Simple shear compaction of basecourse aggregates Pender, M J; Peploe, R J; Duske, G C Proc 6th Australia-New Zealand Conference on
Geomechunics, Christchurch, 3-7 February 1992 P370-374. Publ New Zealand: New Zealand Geomechanics Society. 1992 A method has been developed for rapid assessment of base course aggregates on the basis of their behaviour in cyclic simple shear. A simple shear compactor has been developed for determination of densification and shear stiffness change under stress controlled or strain controlled conditions, Two good quality aggregates (greywacke, basalt) were easily distinguished from a lower quality argillite using this apparatus. 931077
931073
Stress path tests to investigate yielding of Ko consolidated soil
Strain softening of a granular soil in triaxial and multi-axial testing
Allman, M A; Atkinson, J H; Jordan, D O
Chu, J; Lo, S C R; Lee, I K
Geomechualcs, Christchurch, 3-7 February 1992 P298-301. Publ New Zealand." New Zealand Geomechanics Society. 1992
Proc 6th Australia-New Zealand Conference on
Geomeclmnics, Christchurch, 3-7 February 1992 P309-314. Publ New Zealand: New Zealand Geomechanics Society, 1992 A strain path testing technique was developed for study of strain softening of a dense granular soil (Sydney sand). Conventional triaxial compression tests and multi-axial strain path tests were carried out. Four types of strain softening were recognised: those due to end restraint or deviation from ideal test conditions (not a true material property) and pre- and post-failure strain softening. Factors affecting the occurrence of strain softening are discussed.
Proe 6th Australia-New Zealand Conference on
When overconsolidated soil is loaded, it eventually reaches a state where it again becomes normally consolidated and strains begin to accelerate as stiffness decreases. The location of the state boundary surface and assessments of the risk of the soil state reaching this surface are important in design. For one-dimensionally consolidated soils, conventional methods based on stress paths from undrained compression or extension tests are unsuitable for these purposes. The alternative proposed uses drained stress path probing tests. Data are normalised to account for variation in water content. Results
© 1993 Pergamon Press Ltd. Reproduction not permitted
931074
Stresses, displacements, volume changes around the expansion cylinder in the soil
Evaluation of tertiary age gravel deposits using plate load tests
Mecsi, J Proc lOth European Conference on Soil Mechanics and Foundation Engineering, Florence, 26-30 May 1991 V1, P243246. Publ Rotterdam." A A Balkema, 1991
Ervin, M C; Kurzeme, M Proc 6tb Australia-New Zealand Conference on Geomechunics, Christchurch, 3-7 February 1992 P319-323. Publ New Zealand." New Zealand Geomechanics Society. 1992
The problem of expansion of an underground cylindrical cavity in a soil mass may arise in analysis of deep pile foundations, grouted tension anchors, or pressuremeter tests. A method to calculate the stress and strain conditions around an expanding cavity in a cohesive or granular soil is presented. Plastic stress state, nonlinear strain conditions, and volume strain inside the plastic stress zone are evaluated. The stress component changes depend on the compression or tension state of the soil within and outside the plastic stress zone.
Planned refurbishment of an 8 storey building with a single basement level indicated increased foundation loads of up to 30%, exceeding the original design values. Some footings were found to be on several metres of gravelly soil, rather than siltstone as previously assumed. Plate load tests, using the existing structure as a reaction frame, were adopted to assess deformation properties of the gravel deposit. Applied stresses of up to 1500kPa were used and Young's modulus up to 300MPa measured. Settlements due to the increased loads were confidently predicted on the basis of these results. 931075
931071
Screw plate insertion disturbance in sand Brown, P T; Abdel-Latif, M F Proc 6th Australia-New Zealand Conference on Geomechunics, Christchurch, 3-7 February 1992 P302-304. Publ New Zealand." New Zealand Geomechanics Society, 1992 The screw plate test was developed to overcome some of the disadvantages of the flat plate loading tests. Laboratory tests are described which used a screw plate embedded in sand during the process of sand raining and a screw plate inserted under control of a threaded rod of the same pitch as the screw plate. Young's moduli from the two setups are compared and an estimate of the effects of insertion disturbance on the results is made.
931072
Screw plate insertion disturbance in clay Brown, P T; Abdel-Latif, M F Proc 6th Australia-New Zealand Conference on
Geomechunics, Christchurch, 3-7 February 1992 P305-308. Publ New Zealand: New Zealand Geomechanics Society, 1992 Laboratory tests are described which used a flat plate and a screw plate embedded in kaolin clay consolidated from a slurry and a screw plate inserted under control of a threaded rod of the same pitch as the screw plate. Values of Young's modulus and coefficient of consolidation obtained are compared and an estimate made of the effects of insertion disturbance on the results.
Normalised shear strength and compressibility characteristics of Adelaide expansive clay Kaggwa, W S; Jaksa, M B Proc 6th Australia-New Zealand Conference on
Geomechunics, Christchurch, 3-7 February 1992 P330-335. Pub/New Zealand: New Zealand Geomechanics Society,, 1992 Available field and laboratory data on the undrained shear strength and compressibility of Adelaide clays, in particular Keswick Clay, have been collected. Undrained shear strength and Young's modulus have been related to the effective stress state in the soil mass using analyses which take into account soil suction. Despite the wide variation of the values of these properties attributable to the variable stress state in the soil mass and inherent variability of the clay, the normalised values are consistent with those of overconsolidated clays acted on by positive pore pressure. 931076
Simple shear compaction of basecourse aggregates Pender, M J; Peploe, R J; Duske, G C Proc 6th Australia-New Zealand Conference on
Geomechunics, Christchurch, 3-7 February 1992 P370-374. Publ New Zealand: New Zealand Geomechanics Society. 1992 A method has been developed for rapid assessment of base course aggregates on the basis of their behaviour in cyclic simple shear. A simple shear compactor has been developed for determination of densification and shear stiffness change under stress controlled or strain controlled conditions, Two good quality aggregates (greywacke, basalt) were easily distinguished from a lower quality argillite using this apparatus. 931077
931073
Stress path tests to investigate yielding of Ko consolidated soil
Strain softening of a granular soil in triaxial and multi-axial testing
Allman, M A; Atkinson, J H; Jordan, D O
Chu, J; Lo, S C R; Lee, I K
Geomechualcs, Christchurch, 3-7 February 1992 P298-301. Publ New Zealand." New Zealand Geomechanics Society. 1992
Proc 6th Australia-New Zealand Conference on
Geomeclmnics, Christchurch, 3-7 February 1992 P309-314. Publ New Zealand: New Zealand Geomechanics Society, 1992 A strain path testing technique was developed for study of strain softening of a dense granular soil (Sydney sand). Conventional triaxial compression tests and multi-axial strain path tests were carried out. Four types of strain softening were recognised: those due to end restraint or deviation from ideal test conditions (not a true material property) and pre- and post-failure strain softening. Factors affecting the occurrence of strain softening are discussed.
Proe 6th Australia-New Zealand Conference on
When overconsolidated soil is loaded, it eventually reaches a state where it again becomes normally consolidated and strains begin to accelerate as stiffness decreases. The location of the state boundary surface and assessments of the risk of the soil state reaching this surface are important in design. For one-dimensionally consolidated soils, conventional methods based on stress paths from undrained compression or extension tests are unsuitable for these purposes. The alternative proposed uses drained stress path probing tests. Data are normalised to account for variation in water content. Results
© 1993 Pergamon Press Ltd. Reproduction not permitted