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Field description and identification of tropical residual soils
172A
894021 Development of the Wink Sink in west Texas due to salt dissolution and collapse Johnson, K S Proc 2nd Multidisciplinary Conference on Sinkholes and the Environmental Impacts o f Karst, Orlando, 9-11 February 1987 P127-136. Publ Rotterdam: A A Balkema. 1987 This large sinkhole appeared in 1987 in Texas. when upward migration of a cavity developed in salt beds at over 400m depth reached the surface. The likely cause is associated with petroleum extraction in the immediate area. Drilling, completion and plugging of the well left a conduit which allowed water to percolate down the borehole and dissolve the salt. Similar collapses have been seen where salt is removed deliberately in solution mining or by accident.
894022 Study on the variation of bed slope after the construction of sabo dam in steep channels Ho, C W Prac 5th International Symposium on Landslides, Lausanne, !0-15 July 1988 VI. P667-672. Publ Rotterdam. A A Balkema, 1988 Taiwan experiences on average about 1900mm of rain between May and October. Sabo debris dams are used for sediment trapping and channel stabilisation to protect the downstream region. A combination of theoretical analysis and model tests was used to examine sedimentation deposit slopes in the channel, scouring caused by free overflow from the dam crest, and the influences of dam height, discharge and channel bed slope, and the dcvelopmcnt of armouring by aggradation of the channel bed.
Properties of Rocks and Soils 894023 Construction feature of southern China netted red clay Cui, L C Proc 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI, Pl I-16. Publ Rotterdam." A A Balkema, 1988 Netted red clays, formed in subtropical conditions, are widespread in many areas of China. It has recently been recognised that they have superior engineering properties to ordinary red clays in terms of bearing capacity, dynamic slope stability, permeability, and erodibility. Experimental evidence of this is presented. Grain size distribution, chemical analysis, mineralogy, microstructure and macrostructure are described.
size distribution measurement is illustrated. The concept of homomorphy of a collection of particles is introduced and its characteristics defined. The example taken, a mixture of crushed and rolled chips, does show two different facies.
894025 Grading obtained by combined use of microscopy and screening (In French) Besancon. P; Fosse-Lemarchand, B; Lafaye, A Bull Liaison Labs Ponts Chaussees N157, Sept-Oct 1988. P47-55 Particle size characterisation is improved by microscopic examination of the rejects from a sieve column as well as sieving. A procedure to combine these two methods is described, which avoids the limitations of microscopy alone (unrepresentative samples, inability to handle extended size distribution) and of sieving alone (fine particle retention, sieve tolerances, diagonal effect of a square aperture).
894026 Field description and identification of tropical residual soils Cook, J R; Newill, D Proc 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI, ['3-10. Publ Rotterdam: A A Balkema. 1988 Tropical soils may differ t¥om those in more temperate climates as a result of more intense weathering, particularly where hydrolysis, decomposition and recomposition have occurred. A separate classification system based on weathering and pedogenic factors has been developed. Methods for field work to aid in identification are described. These deal separately with general site characteristics, soil material, and soil mass characteristics, and can be varied according to the projcct undertaken.
894027 Fabric variability and index testing of a granitic saprolite Irfan, T Y Proc 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI, P25-35. Publ Rotterdam: A A Balkema, 1988 Residual soils are complex heterogeneous materials, whose engineering properties are influenced by the microfabrics developed during weathering and alteration. The fabric, grain size, void ratio, and density variability found at a site and within samples from that site are described. Effects of this variability on shear behaviour in direct shear tests are illustrated, and index tests for soil classification discussed.
Deformation and strength characteristics
Composition, structure texture and density
See also: 894149, 894194, 894195
894024 Attempt to quantify particle shape: shape ratio and degree of homomorphism of a collection of particles (In French) Ravier, G Bull Liaison Lab Ponts Chaussees N157, Sept-Oct 1988. P3946
894028 Compression testing of geomembrane soil interfaces Hansen, L A; Deatherage, J D in: Geotechnical Aspects o f Heap Leach Design, edited by D van Zyl P15-22. Publ Littleton: AIME, 1987
The importance of shape as well as size in particle size distribution is first discussed. A shape ratio for each particle is proposed, defined as the ratio of the projected area of the particle to the area of the circle projected from its exodiameter. This ratio is justified using models from diamonds to ellipses. Complete interpretation using results from photographic particle
The performance of geomembranes and geotextiles under compression loading,simulating heap or dump leach operation, was assessed in the laboratory using standard ASTM compression and relative density moulds, and a purpose built large diameter pressurised mould. Synthetic liners were sandwiched between representative subgrade soils and cover materials. Performance was evaluated by visual inspection and
~ 1989 Pergamon Press plc. Reproduction not permitted
894021 Development of the Wink Sink in west Texas due to salt dissolution and collapse Johnson, K S Proc 2nd Multidisciplinary Conference on Sinkholes and the Environmental Impacts o f Karst, Orlando, 9-11 February 1987 P127-136. Publ Rotterdam: A A Balkema. 1987 This large sinkhole appeared in 1987 in Texas. when upward migration of a cavity developed in salt beds at over 400m depth reached the surface. The likely cause is associated with petroleum extraction in the immediate area. Drilling, completion and plugging of the well left a conduit which allowed water to percolate down the borehole and dissolve the salt. Similar collapses have been seen where salt is removed deliberately in solution mining or by accident.
894022 Study on the variation of bed slope after the construction of sabo dam in steep channels Ho, C W Prac 5th International Symposium on Landslides, Lausanne, !0-15 July 1988 VI. P667-672. Publ Rotterdam. A A Balkema, 1988 Taiwan experiences on average about 1900mm of rain between May and October. Sabo debris dams are used for sediment trapping and channel stabilisation to protect the downstream region. A combination of theoretical analysis and model tests was used to examine sedimentation deposit slopes in the channel, scouring caused by free overflow from the dam crest, and the influences of dam height, discharge and channel bed slope, and the dcvelopmcnt of armouring by aggradation of the channel bed.
Properties of Rocks and Soils 894023 Construction feature of southern China netted red clay Cui, L C Proc 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI, Pl I-16. Publ Rotterdam." A A Balkema, 1988 Netted red clays, formed in subtropical conditions, are widespread in many areas of China. It has recently been recognised that they have superior engineering properties to ordinary red clays in terms of bearing capacity, dynamic slope stability, permeability, and erodibility. Experimental evidence of this is presented. Grain size distribution, chemical analysis, mineralogy, microstructure and macrostructure are described.
size distribution measurement is illustrated. The concept of homomorphy of a collection of particles is introduced and its characteristics defined. The example taken, a mixture of crushed and rolled chips, does show two different facies.
894025 Grading obtained by combined use of microscopy and screening (In French) Besancon. P; Fosse-Lemarchand, B; Lafaye, A Bull Liaison Labs Ponts Chaussees N157, Sept-Oct 1988. P47-55 Particle size characterisation is improved by microscopic examination of the rejects from a sieve column as well as sieving. A procedure to combine these two methods is described, which avoids the limitations of microscopy alone (unrepresentative samples, inability to handle extended size distribution) and of sieving alone (fine particle retention, sieve tolerances, diagonal effect of a square aperture).
894026 Field description and identification of tropical residual soils Cook, J R; Newill, D Proc 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI, ['3-10. Publ Rotterdam: A A Balkema. 1988 Tropical soils may differ t¥om those in more temperate climates as a result of more intense weathering, particularly where hydrolysis, decomposition and recomposition have occurred. A separate classification system based on weathering and pedogenic factors has been developed. Methods for field work to aid in identification are described. These deal separately with general site characteristics, soil material, and soil mass characteristics, and can be varied according to the projcct undertaken.
894027 Fabric variability and index testing of a granitic saprolite Irfan, T Y Proc 2nd International Conference on Geomechanics in Tropical Soils, Singapore, 12-14 December 1988 VI, P25-35. Publ Rotterdam: A A Balkema, 1988 Residual soils are complex heterogeneous materials, whose engineering properties are influenced by the microfabrics developed during weathering and alteration. The fabric, grain size, void ratio, and density variability found at a site and within samples from that site are described. Effects of this variability on shear behaviour in direct shear tests are illustrated, and index tests for soil classification discussed.
Deformation and strength characteristics
Composition, structure texture and density
See also: 894149, 894194, 894195
894024 Attempt to quantify particle shape: shape ratio and degree of homomorphism of a collection of particles (In French) Ravier, G Bull Liaison Lab Ponts Chaussees N157, Sept-Oct 1988. P3946
894028 Compression testing of geomembrane soil interfaces Hansen, L A; Deatherage, J D in: Geotechnical Aspects o f Heap Leach Design, edited by D van Zyl P15-22. Publ Littleton: AIME, 1987
The importance of shape as well as size in particle size distribution is first discussed. A shape ratio for each particle is proposed, defined as the ratio of the projected area of the particle to the area of the circle projected from its exodiameter. This ratio is justified using models from diamonds to ellipses. Complete interpretation using results from photographic particle
The performance of geomembranes and geotextiles under compression loading,simulating heap or dump leach operation, was assessed in the laboratory using standard ASTM compression and relative density moulds, and a purpose built large diameter pressurised mould. Synthetic liners were sandwiched between representative subgrade soils and cover materials. Performance was evaluated by visual inspection and
~ 1989 Pergamon Press plc. Reproduction not permitted